Journal articles: 'Modulus elasticity'

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Dyman, Marianna, Andrii Moltasov, and Serhii Kalyuzhny. "Calculation and experimental procedure for determining the modulus of elasticity of porous coatings on a substrate during bending. Part 1. Theoretical foundations." Mechanics and Advanced Technologies 6, no. 2 (2022): 139–42. http://dx.doi.org/10.20535/2521-1943.2022.6.2.261923.

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The purpose of this work is to develop a design and experimental technique for determining the modulus of elasticity of one of the layers of a two-layer bar of rectangular cross section during bending, provided that the modulus of elasticity of the other layer is known. In this part of the work, using the transition formulas of relatively parallel axes, a mathematical expression has been obtained to determine the bending stiffness of a two-layer rectangular section, which does not include distances from the centers of weight of sections of layers to the pivot center of weight of the entire section, which, in turn, depend on the elastic modules of layers. The presence of such an expression made it possible to form an algebraic equation in which the modulus of elasticity of one of the layers can act as an unknown. As a result, the mathematical connection of the unknown modulus of elasticity with the known modulus of elasticity of the other layer, geometric dimensions of layers and bending stiffness of the entire section was established, which should be determined experimentally.

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Scott-Baumann, Alison. "The modulus of elasticity." Francosphères 7, no. 2 (2018): 147–62. http://dx.doi.org/10.3828/franc.2018.11.

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Pramreiter, Maximilian, Alexander Stadlmann, Florian Linkeseder, Jozef Keckes, and Ulrich Müller. "Non-destructive testing of thin birch (Betula pendula Roth.) veneers." BioResources 15, no. 1 (2020): 1265–81. http://dx.doi.org/10.15376/biores.15.1.1265-1281.

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In technical applications of wood-based composites, the predictability of elasticity and strength is important. The aim of this study was to predict the static modulus of elasticity and tensile strength of thin (0.55 mm ± 0.05 mm) birch veneers. Based on the dynamic modulus of elasticity estimated via means of wave transmission time the observed dynamic modulus of elasticity was on average 14% lower than the corresponding static modulus of elasticity. This difference could be explained by a decreased measuring area during the tensile testing or by defects within the samples. The dynamic modulus of elasticity correlated well with the static modulus of elasticity (r = 0.821). Therefore, using wave transmission time to non-destructively predict the elasticity of veneers proves to be a promising tool. The dynamic modulus of elasticity showed a significant and positive correlation with the tensile strength (r = 0.665), but this correlation was weaker than with the static modulus of elasticity. Therefore, the wave transmission time or the static modulus of elasticity must be combined with additional strength-influencing properties, such as fiber angle or density, to allow for a highly accurate prediction of tensile strength.

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Hu, Ying Cheng. "Predicting Modulus of Elasticity for Wood-Based Composites." Materials Science Forum 575-578 (April 2008): 1106–10. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1106.

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The modulus of elasticity of wood, fiberboard and wood-fiberboard composite was measured by nondestructive test (longitudinal transmission vibration method). The predicting model of the modulus of elasticity of wood-fiberboard composite was discussed. This study has shown that the wood ratio has substantial effect on the modulus of elasticity of wood-fiberboard composite. The modulus of elasticity of wood-fiberboard composite can be predicted from volume fraction of wood by simulation formula. The model Eq.(3) can be used to predict the modulus of elasticity of the wood-fiberboard composite from the modulus of elasticity and volume fraction of wood and fiberboard when M=0.92~0.97. The model Eq.(4) can be used to predict the modulus of elasticity of the wood-fiberboard composite from the modulus of elasticity and volume fraction of wood and fiberboard when M=0.97~0.99.

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Brožovský, Jiří, and Ámos Dufka. "Comparison of Dynamic Young's Modulus of Elasticity Values Measured by Ultrasonic Pulse and Resonance Methods." Advanced Materials Research 1100 (April 2015): 193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1100.193.

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Dynamic Young ́s modulus of elasticity can be determined by ultrasonic pulse method and resonance method. Because of the difference in the way of introducing tension into a test specimen, the values of modulus of elasticity differ. Dynamic Young ́s modulus of elasticity measured by ultrasonic pulse method is higher; the difference stated for concrete is 5 to 20%. It was found that the dynamic Young's modulus of elasticity of calcium silicate bricks and prisms measured by ultrasonic pulse method is on average higher by 9.5% than dynamic Young's modulus of elasticity measured by resonance method. If dynamic Young's modulus of elasticity is converted to static modulus of elasticity, this difference has to be taken into account by means of appropriate coefficient.

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He, Jian Yun, Yu Mei Ding, Zi Chen Xue, and Wei Min Yang. "Research on the Elasticity Modulus of Short Glass Fiber / Thermoplastic Polyurethane (SGF-TPU) Composites." Key Engineering Materials 561 (July 2013): 152–57. http://dx.doi.org/10.4028/www.scientific.net/kem.561.152.

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Based on fiber length, fiber orientation distribution and fraction volume, the Halpin-Tsai’ elasticity modulus prediction equation were modified and the elasticity modulus of SGF/TPU composites was experimentally studied. The relationship between the structure and elasticity modulus of SGF/TPU composites was discussed. Results showed that the elasticity modulus of GF-TPU composite rapidly increased as the increasing of fiber volume fraction () and the increasing of the fiber length at the range of 0%-20%. The modified prediction equation of the elasticity modulus fits the test result quite well.

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Kechur, D. I., A. S. Masyuk, V. Ye Levytskyi, D. B. Kysil та N. V. Chopyk. "ТECHNOLOGICAL FEATURES OF OBTAINING STARCH-CONTAINING POLYLACTIDE MATERIALS FOR 3D PRINTING". Chemistry, Technology and Application of Substances 6, № 2 (2023): 150–54. http://dx.doi.org/10.23939/ctas2023.02.150.

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Polylactide composite materials with organic filler-modifier starch, inorganic filler -calcium carbonate and plasticizer – epoxidized soybean oil for 3D printing have been developed. On the basis of the modular deformation method of calculation the elastic-plastic and deformation properties of the developed modified polylactide materials are determined. The change of modulus of deformation, modulus of elasticity, modulus of high elasticity depending on the composition of the composite is revealed. The surface hardness, Vicat softening point and thermomechanical characteristics of the developed polylactide materials are determined

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Takarini, Veni, Nina Djustiana, and Renny Febrida. "Pengaruh partikel filler terhadap modulus elastisitas resin komposit Effect of filler particles on the elastic moduli of resin composites." Journal of Dentomaxillofacial Science 11, no. 1 (2012): 39. http://dx.doi.org/10.15562/jdmfs.v11i1.292.

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Modulus of elasticity is one of the mechanical properties of composite resins affects the resistance to deformation,the strength of bonding with tooth structure and wear resistance. Modulus of elasticity is determined by the volumefraction of filler particles as the inorganic phase composite resin. This literature study aims to evaluate the size,shape and type of filler particles that affect the modulus of elasticity for composite resin. In a constant volumefraction, the larger size of filler material tends to make more rigid while irregular shape of particles produceshigher modulus of elasticity than spherical form of particles. In addition, the type of filler particles also determinesthe modulus of elasticity for resin composite, such as silica as the main type of filler particles will enhance themodulus of elasticity whereas zirconium can result in a higher stiffness. In order to get composite resin restorationwith appropriate modulus of elasticity the necessary knowledge about the effect of different filler particle isrequired.

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Commandeur, Paul R., and Marvin R. Pyles. "Modulus of elasticity and tensile strength of Douglas-fir roots." Canadian Journal of Forest Research 21, no. 1 (1991): 48–52. http://dx.doi.org/10.1139/x91-007.

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The modulus of elasticity and the tensile strength were determined for a sample of live Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) roots collected in the Oregon Coast Range. Most of the roots displayed both a "form" modulus of elasticity and a "material" modulus of elasticity. The form modulus occurred as a tortuous root straightened out, whereas the material modulus developed following this initial straightening as the wood fibers within the root directly resisted elongation. The average form and material moduli of elasticity were, respectively, 185 and 503 MPa, whereas the average tensile strength was 17 MPa.

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Slavin, Abraham. "THE EFFECTIVE MODULUS OF ELASTICITY." Annals of the New York Academy of Sciences 93, no. 6 (2006): 209–75. http://dx.doi.org/10.1111/j.1749-6632.1962.tb30519.x.

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Cramer, Steven, David Kretschmann, Roderic Lakes, and Troy Schmidt. "Earlywood and latewood elastic properties in loblolly pine." Holzforschung 59, no. 5 (2005): 531–38. http://dx.doi.org/10.1515/hf.2005.088.

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Abstract The elastic properties of earlywood and latewood and their variability were measured in 388 specimens from six loblolly pine trees in a commercial plantation. Properties measured included longitudinal modulus of elasticity, shear modulus, specific gravity, microfibril angle and presence of compression wood. Novel testing procedures were developed to measure properties from specimens of 1 mm×1 mm×30 mm from earlywood or latewood. The elastic properties varied substantially circumferentially around a given ring and this variation was nearly as large as the variation across rings. The elastic properties varied by ring and height, but while the modulus of elasticity increased with height, the shear modulus decreased with height. A strong correlation was found between modulus of elasticity and shear modulus, but only at low heights and inner rings. Specific gravity and microfibril angle were the strongest predictors of elastic properties and explained 75% of the variation in modulus of elasticity for latewood. Despite being the best predictors in this study, these parameters accounted for less than half of the variability of earlywood modulus of elasticity, earlywood shear modulus and latewood shear modulus.

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Tipka, Martin, and Jitka Vašková. "Modulus of Elasticity in Tension for Concrete and Fibre Reinforced Concrete." Solid State Phenomena 259 (May 2017): 35–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.35.

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The paper deals with the determination of the modulus of elasticity in tension for cementitious composites and comparing these values with the values of modulus in compression. It describes several methods, which are usually used for determination of modulus of elasticity of concrete and fibre reinforced concrete. In the experimental program modulus of elasticity in compression and tension of various types of concrete and fibre reinforced concrete were compared. The classic test with prismatic specimens was used for determination of the modulus in compression; a new arrangement of uniaxial tension test of cementitious composites was used for determination of the modulus of elasticity in tension.

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Warinussy, Rachel Priskila Louwrensya, Dewi Kristiana, and FX Ady Soesetijo. "Pengaruh Perendaman Nilon Termoplastik Dalam Berbagai Konsentrasi Ekstrak Bunga Cengkeh Terhadap Modulus Elastisitas (The Effect of Thermoplastic Nylon Immersion In Various Concentration of Clove Flower Extract to the Modulus Elasticity)." Pustaka Kesehatan 6, no. 1 (2018): 179. http://dx.doi.org/10.19184/pk.v6i1.7155.

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 Background:Thermoplastic nylon is one of denture basic alternative made by resin polyamide because its high flexibility and good translutient, but hard to be smoothed and polished causing food waste accumulation and plaque formation. Clove flower extract proved as antiseptic used to be a denture cleanser material, but its contens of phenol essence can break the thermoplastic nylon chain. Purpose: The aim of this study was to determine the effect of thermoplastic nylon immersion in various concentration: 0,8%, 1%, 1,2%, 1,4% and 1,6%, of clove flower extract to the modulus elasticity. Materials and Methods: This study was an laboratories experimental using post-test only control group design. The samples in 65 mm x 10 mm x 2,5 mm size were 30 samples. Those samples grouped into 6 groups immersed in aquadest and clove flower extract solution that is grouped based on the concentrations: 0,8%, 1%, 1,2%, 1,4% and 1,6% for 23 days. The modulus elasticity of thermoplastic nylon measured with Universal Testing Machine (UTM). Data was analysed using One Way Anova. Result and Conclusions: the conclusion of this study represented that thermoplastic nylon plates immersion in clove flower extract at the concentration 0,8%, 1%, 1,2%, 1,4% and 1,6% was affected the modulus elasticitys. The most effective clove extract concentration to be use as denture cleanser was 1,6% because it has the lowest increasing value of nylon thermoplastic modulus elasticity.  Keyword: Clove flower extract, modulus elasticity, thermoplastic nylon.

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Khegai, A. O., N. M. Kirilin, T. S. Khegai, and O. N. Khegai. "Experimental investigation of stress-strain properties of steel fiber reinforced concrete of the higher classes." Вестник гражданских инженеров 17, no. 6 (2020): 77–82. http://dx.doi.org/10.23968/1999-5571-2020-17-6-77-82.

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The tangent modulus of elasticity and deformation modulus are the most important characteristics of steel fiber reinforced concrete. The tangent modulus of elasticity corresponds to the initial loading stage, whereas in the operation stage and the fracture stage, there is a modulus of the material deformation, which is smaller, due to the formation of cracks in the element and non-linear behavior of the material. The paper presents experimental investigations of the tangent modulus of elasticity and the deformation modulus of fiber-reinforced concrete, class В60 at various percentages of fiber reinforcement. Existing approaches to determination of the tangent modulus of elasticity are considered. The results obtained are compared with those presented by other researchers. Analytical dependence is proposed for determination of deformation modulus depending on the percentage of fiber reinforcement.

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Qu, Tie Jun, and Rong Huan Xu. "The Influence of Ratio of Reinforcement to Modulus of Elasticity of Reinforce Concrete Component." Advanced Materials Research 859 (December 2013): 233–37. http://dx.doi.org/10.4028/www.scientific.net/amr.859.233.

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Modulus of elasticity is an important mechanical parameter in analysis and design of reinforce concrete structures. The present value of modulus of elasticity ，which has rare relation with ratio of reinforcement ，is based on plain concrete. Authors deduced an equation between modulus of elasticity and ratio of reinforcement, and then an experimental study was conducted on 11 groups’ component of reinforce concrete with different ratio of reinforcement. At last, an equation for modulus of elasticity of different ratio of reinforcement determined by regression, using least squared method, was described. A cantilever, whose dynamic characteristics and response were calculated, was taken as an example to analyze influence of ratio of reinforcement on the structural analysis .Result shows that ratio of reinforcement has effect on modulus of elasticity . Moreover, if general modulus is ignored when calculate dynamic response, it will cause deviation.

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Wu, Aixiang, Yong Wang, Bo Zhou, and Jiahua Shen. "Effect of Initial Backfill Temperature on the Deformation Behavior of Early Age Cemented Paste Backfill That Contains Sodium Silicate." Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/8481090.

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Enhancing the knowledge on the deformation behavior of cemented paste backfill (CPB) in terms of stress-strain relations and modulus of elasticity is significant for economic and safety reasons. In this paper, the effect of the initial backfill temperature on the CPB’s stress-strain behavior and modulus of elasticity is investigated. Results show that the stress-strain relationship and the modulus of elasticity behavior of CPB are significantly affected by the curing time and initial temperature of CPB. Additionally, the relationship between the modulus of elasticity and unconfined compressive strength (UCS) and the degree of hydration was evaluated and discussed. The increase of UCS and hydration degree leads to an increase in the modulus of elasticity, which is not significantly affected by the initial temperature.

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Almeida Del Savio, Alexandre Almeida Del, Darwin La Torre La Torre Esquivel, Julian Carrillo, and Emilio Chi Chi Yep. "Determination of Polypropylene Fiber-Reinforced Concrete Compressive Strength and Elasticity Modulus via Ultrasonic Pulse Tests." Applied Sciences 12, no. 20 (2022): 10375. http://dx.doi.org/10.3390/app122010375.

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Compressive strength and elasticity modulus are the main mechanical properties of concrete. The non-destructive ultrasound pulse test can be used to determine these properties without compromising the structure’s integrity. This study seeks to assess whether a correlation exists (1) between the Reinforcement Index (RI) and the mechanical properties, (2) between the RI and the dynamic properties, and (3) among the dynamic properties of polypropylene fiber-reinforced concrete. The RI was modified through fiber volume fraction (0-, 0.4-, 0.8- and 1.2%) and fiber length (40, 50 and 60 mm). The dynamic properties were assessed through dynamic elasticity modulus and ultrasonic pulse velocity (UPV), which were determined by direct, semi-direct, and indirect prospect methods. Finally, compressive strength, static elasticity modulus, and Poisson’s ratio were assessed through destructive tests. Their relationship with UPV and the dynamic elasticity modulus is also subsequently studied. The results reveal a correlation between RI and compressive strength and UPV; however, the static elasticity modulus only exhibits a correlation with UPV in one of its measurement methods. Finally, empirical models were developed for predicting compressive strength, elasticity modulus as a function of ultrasonic pulse velocity and RI, and dynamic elasticity modulus as a function of compressive strength and RI.

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Yang, Xue Chun, and Ju Ying Luo. "Research on Compression and Bending Resistance Characteristics of Logs." Advanced Materials Research 413 (December 2011): 117–21. http://dx.doi.org/10.4028/www.scientific.net/amr.413.117.

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The testing experiments to healthy poplar and larch logs samplings were conducted by using hydraulic machine. The relationships among compression and bending strength, modulus of elasticity in compression and bending were studied in the two logs samplings. The results indicated that, in the both species, the compression strength had certain linear correlation with bending strength, and so did the modulus of elasticity in compression and bending. Meanwhile there were remarkable linear correlations with the compression strength and the modulus of elasticity in compression as well as the bending strength and the modulus of elasticity in bending.

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Yunak, Alina, Ivan Kopynets, and Oksana Sokolova. "ADJUSTMENT OF THE CALCULATED VALUE OF THE ELASTICTY MODULUS OF ASPHALT CONCRETE." Dorogi i mosti 2024, no. 29 (2024): 74–87. http://dx.doi.org/10.36100/dorogimosti2024.29.074.

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Introduction. One of the most important characteristics of asphalt concrete that characterizes its properties is the elasticity modulus. The elasticity modulus of asphalt concrete is used in the design of pavement structures to calculate its permissible elastic deflection, under the condition of shear resistance of the working subgrade layer and the layers of non-cohesive materials, as well as bending tensile strength. Problem statement. Today, the calculated value of the elasticity modulus of asphalt concrete is taken in accordance with Handbook No. 2 «Design Characteristics of Asphalt Concrete» [2]. In this Handbook, the calculated value of the elasticity modulus of asphalt concrete is given depending on the bitumen grade, temperature, type of asphalt mixture, and time of load action. Numerical design values of the elasticity modulus of asphalt concrete are provided only for asphalt concrete type B; for other types of asphalt concrete, it is proposed to reduce or increase the design value of the elasticity modulus by the value that depends on the type of asphalt concrete and temperature. Since 2020, a new standard on technical requirements for bitumen has been in force in Ukraine, which brings bitumen grades in line with the European classification [4]. At the same time, in the Handbook No. 2 [2], the calculated value of the elasticity modulus of asphalt concrete is given in accordance with the previous bitumen grades, which necessitates their adjustment.

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Karakaš Janjić, Nikolina, Tanja Kalman Šipoš, and Mirta Benšić. "Determination of the mechanical properties of recycled brick aggregate concrete by multivariate regression analysis." Advances in Civil and Architectural Engineering 15, no. 29 (2024): 151–67. https://doi.org/10.13167/2024.29.10.

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This study presents regression models for prediction of compressive strength and modulus of elasticity, applying variables such as the percentage of recycled brick aggregate replacement, cement content, and water-cement ratio. A comprehensive database was constructed, comprising data from 180 experimental tests conducted on recycled brick aggregate concrete. The database includes the findings of compressive strength and modulus of elasticity testing. Multivariate statistical analysis was performed on the data and prediction models were created. During the review of the existing literature, a research gap was observed, where the modulus of elasticity was always expressed with dependence on compressive strength. The modulus of elasticity and compressive strength are modelled separately using the values of the contents of the concrete mixture. From the derived equations, the relationship that the modulus of elasticity is the second root of the compressive strength is recognized, which is in accordance with the functional relationships of the modulus of elasticity and compressive strength determined by previous authors. These models were then evaluated and confirmed using a subset of 20 samples for compressive strength and 13 samples for modulus of elasticity, which were excluded from the main database. The main results confirmed the applicability of the proposed equations with acceptable accuracy for initial concrete mixtures and thus, can be used as guidelines by future researchers.

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Medvedev, M. A., A. M. Cherkasov, and E. V. Tararushkin. "Temperature dependence of dynamic and static modulus of elasticity of lightweight expanded clay aggregate concrete." Journal of Physics: Conference Series 2094, no. 4 (2021): 042052. http://dx.doi.org/10.1088/1742-6596/2094/4/042052.

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Abstract The paper presents experimental research the static and dynamic modulus of elasticity of lightweight expanded clay aggregate concrete with averaged density of 1000 kg/m3. The static and dynamic modulus are obtained depending on the influence of temperature in the range from 5 to 50 °C with a step of 15 °C. The dynamic modulus was determined without pre-compression with a testing machine Asphalt Mixture Performance Tester. Besides the modulus of elasticity of lightweight concrete, the temperature dependence of unconfined compressive strength was also determined. Analysis of experimental data showed that with an increase in temperature, strength and modulus of elasticity slightly decrease, which is typical for concretes. For all cases, the temperature dependence can be characterized according to the linear law. Comparison of the static and dynamic modulus of elasticity showed that the dynamic modulus is 60-74% greater than the static modulus over the entire range of the studied temperatures.

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Lee, Chiaju, Chihhsein Lin, Minjay Chung, and Mingjer Tsai. "Evaluation of the strength characteristics of Cunninghamia lanceolata timber using continuous mechanical stress rating equipment." BioResources 17, no. 1 (2022): 1411–26. http://dx.doi.org/10.15376/biores.17.1.1411-1426.

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Before timber is used for engineering and structural purposes, it is necessary to grade the strength of the timber. In order to obtain the static modulus of elasticity value of timber quickly and accurately, this study used ultrasonic waves and continuous mechanical stress rating equipment and two non-destructive test methods to analyze the correlation between the non-destructive test measured value and the static modulus of elasticity value. It also evaluated the influence of the feeding orientation of the boards, the forward and reverse feed directions, feeding speed, and break area ratio. The analysis results indicated that the modulus of elasticity value determined through continuous mechanical stress rating equipment had the highest correlation with the static modulus of elasticity value. Moreover, according to the results, the feeding orientation of the boards, the forward and reverse feed directions, and the feeding speed did not influence the prediction of the continuous mechanical stress rating equipment modulus of elasticity value. Meanwhile, to ensure the accuracy and uniformity of the continuous mechanical stress rating equipment modulus of elasticity detection value, it is necessary to avoid an excessively high break area ratio in Cunninghamia lanceolata timber during the preparation process.

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Asadollahi, Ali, Gholamhossein Shahgholi, Mariusz Szymanek, and Agata Dziwulska-Hunek. "Comparative Analysis of the Effects of Manure and Vermicompost on the Elasticity Modulus of Loam Soil in Different Moistures." Acta Technologica Agriculturae 27, no. 3 (2024): 125–32. http://dx.doi.org/10.2478/ata-2024-0017.

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Abstract This study aims to investigate the effects of manure and vermicompost in terms of soil elasticity modulus changes in loam soil. The uniaxial compression test measures the compressive strength of a soil cylinder without any lateral load. The modulus of elasticity was determined by plotting the strain-stress diagrams and calculating the slope of these diagrams. The increase in moisture and organic matter content significantly improved soil flexibility and decreased its elasticity modulus. It was found that adding animal manure had a greater effect on the flexibility of the soil as compared to vermicompost, while the elasticity modulus of the samples containing animal manure was lower. The interaction effect of moisture and the organic matter content indicated that the increase in humidity was more effective in the soil containing vermicompost as compared to the soil containing manure, such that when the manure rate was around 19%, the moisture increase had no significant impact on the elasticity modulus. It was found that adding organic matter was more effective at the low moisture level of 15.5% than at higher moistures where the effect of adding organic matter did not affect the soil elasticity modulus decrement as strongly.

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Uysal, Orkun, İlbüke Uslu, Can B. Aktaş, Byungik Chang, and İsmail Özgür Yaman. "Physical and Mechanical Properties of Lightweight Expanded Clay Aggregate Concrete." Buildings 14, no. 6 (2024): 1871. http://dx.doi.org/10.3390/buildings14061871.

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The porous nature of lightweight expanded clay aggregate (LECA) is decisive in the physical and mechanical properties of concrete. A comprehensive experimental study consisting of 13 different mixtures and 234 specimens was carried out on density, absorption capacity, porosity, compressive strength, splitting tensile strength, modulus of elasticity, and the effect of moisture state of LECA concrete. Dry compressive strengths of mixtures were found to be between 18–38 MPa, and 9% higher on average than moist compressive strength. Modulus of elasticity values decreased significantly when specimens were oven-dried, where the decrease was 26% on average. The study also includes an evaluation of modulus of elasticity prediction models. All prediction models consistently overestimated dry modulus of elasticity, which is problematic for structural applications of LECA concrete. A unique model for modulus of elasticity prediction was developed as part of the study and verified using independent data from literature for its accuracy.

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Reiterman, Pavel. "Static Modulus of Elasticity of Concrete." Materials Science Forum 824 (July 2015): 151–54. http://dx.doi.org/10.4028/www.scientific.net/msf.824.151.

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Present paper deals with the experimental investigation of static modulus of elasticity of hardened concrete and its relation to compressive strength of concrete. Based on the number of measurement was derived expression of dependence of modulus of elasticity on compressive strength of concrete which was determined using cubic specimens; modulus of elasticity was measured using prismatic specimens of dimensions 100x100x400 mm. Studied concrete mixtures present commonly used concrete of all established strength classes.

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Kocáb, Dalibor, Vlastimil Bílek Jr., Libor Topolář, Petr Daněk, Barbara Kucharczyková, and Petr Pőssl. "Influence of a Shrinkage-Reducing Admixture on the Damage to the Internal Structure of Alkali-Activated Composites during Testing of the Modulus of Elasticity." Solid State Phenomena 272 (February 2018): 28–33. http://dx.doi.org/10.4028/www.scientific.net/ssp.272.28.

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This article deals with an experimental determination of the static modulus of elasticity in compression on fine-grained composites based on alkali-activated slag. This experiment included an alkali-activated composite without a shrinkage-reducing admixture and the same composite with a shrinkage-reducing admixture. The test specimens were subjected to testing of the dynamic modulus of elasticity using the ultrasonic pulse velocity test and the resonance method as well as of the static modulus of elasticity in compression. The static modulus of elasticity test was accompanied by the measurement of the acoustic activity of the material using the acoustic emission method, whose advantages is the possibility to detect early formation and propagation of cracks in the internal structure of the material. The output of the described experiment is a detailed evaluation of the differences in the behaviour of the tested alkali-activated composites based on the observed values of the modulus of elasticity and the recorded acoustic activity of the material during loading.

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Carrasco, E. V. M., Fernando Murilo Gontijo Ramos, L. G. Moura, et al. "Determination of Elastic Constants of Cross-Laminated Bamboo (CLB) through Non-Destructive Testing." Key Engineering Materials 948 (June 6, 2023): 129–38. http://dx.doi.org/10.4028/p-45nq7z.

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The aim of this work is the evaluation by non-destructive impulse excitation tests, the modulus of elasticity (E) and the transversal deformation modulus (G) of cross laminated bamboo (CLB). Tests were performed on twenty-three CLB specimens measuring: 12 mm (height), 40 mm (width) and 12 mm (length). Twelve specimens have two lamellas with fibers at 0 °, longitudinal direction, and one layer with fibers at 90 °, normal direction (N) and the other eleven specimens have two layers in the normal direction and one in the longitudinal direction (L). The tests were performed using the Sonelastic apparatus indicated for the estimation of the dynamic modulus of elasticity and the damping of materials by the impulse excitation technique. A software attached to the apparatus analyzes the acoustic wave generated, and from it, the dynamic modulus of elasticity is determined. In order to verify the significance of this estimation, semi-destructive, three-point bending tests were performed in a universal test machine, determining E and G. It was concluded that the estimation of the modulus of elasticity is very significant when compared with the semi-destructive tests, and this method can be used to estimate the elasticity modulus of the CLB with high precision (R2 = 99% and p-value <0.001). Modulus of elasticity in the longitudinal direction were five times larger than those in the normal direction.

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Mollahassani, Amir, AmirHooman Hemmasi, Habibollah Khademi Eslam, Amir Lashgari, and Behzad Bazyar. "Dynamic and static comparison of beech wood dovetail, tongue and groove, halving, and dowel joints." BioResources 15, no. 2 (2020): 3787–98. http://dx.doi.org/10.15376/biores.15.2.3787-3798.

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Dynamic and static elastic properties beech wood joints were assessed. Conventional joints, namely dovetail, tongue and groove, dowel, and halving joints were prepared with beech wood (Fagus orientalis Lipsky) using polyvinyl acetate and cyanoacrylate adhesives. The results of the dynamic and static modulus of elasticity of the joints in this research indicated the highest reduction trends in halving, dowel, tongue and groove, and dovetail joints, respectively. The modulus of dovetail joint elasticity, its homogeneous joint texture, and lack of an extended adhesive line, corresponded to that of the jointed samples. The average static modulus of elasticity was approximately 10.5% lower than that of the dynamic modulus of elasticity. The results of the Student’s t-test indicated a significant difference between the mean of dynamic and the mean of static modulus of elasticity, significance at 5% level and the Pearson correlation test indicated that the dynamic and static modulus of elasticity of the samples were significant at the 5% level and indicated a positive correlation. Based on the observed correlation in the dynamic and static tests’ results, using these methods, dynamic assessment of NDTs may be regarded as an appropriate alternative in standardizing destructive static testing for wood assessment and categorization.

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Miccoli, Lorenzo, and Franz Loderer. "Influence of material properties on the modulus of elasticity of AAC masonry." ce/papers 6, no. 2 (2023): 109–14. http://dx.doi.org/10.1002/cepa.2225.

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AbstractAimThe goal of the presented study is to evaluate the influence of material properties on the modulus of elasticity of autoclaved aerated concrete masonry. In addition, it was assessed the reliability of the KE value included in the Eurocode 6 to calculate the modulus of elasticity of AAC masonry in relation to its characteristic compressive strength.MethodAn experimental campaign for the determination of modulus of elasticity of AAC masonry with a characteristic compressive strength in the range of 1.3‐2.0 MPa, was carried out. AAC units from different plants in Europe have been tested as well as the thin layer mortar used for the samples. The values of bulk density range between 270 and 350 kg/m3. Moreover, the testing comprised the determination of compressive strength as well as modulus of elasticity of masonry erected by using these blocks. Basis for testing of the compressive strength and modulus of elasticity was EN 1052‐1.ResultsThe experimental results were compared with the values of modulus of elasticity E calculated according to EN 1996‐1‐1. The comparison shows how the current range of values of KE reported by the German annex DIN EN 1996‐1‐1/NA fits well to the experimental results obtained.

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Waheed, Mohanned Q., and Noor M. Asmael. "Evaluation of Elasticity Modulus of Clayey Soil from Undrained Shear Strength." E3S Web of Conferences 427 (2023): 01028. http://dx.doi.org/10.1051/e3sconf/202342701028.

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The modulus of elasticity represents the soil stiffness; it was used to design and analyze the foundation, slope stability, retaining structure, etc. It is one of the main input parameters used in the finite element method for analyzing soil behavior. The scope of this study is to evaluate the correlation between the modulus of elasticity (E) and the cohesion of the soil (cu) for the remolded and undisturbed samples of clayey soil so it can assess the effect of lateral confining pressure on the soil modulus of elasticity. The unconfined test is chosen for remolded soil to identify the stress-strain behavior. After the experimental utilized is done, the test is modeled using the finite element method to study several states of soil. The PLAXIS program is utilized, and the results are compared with the practical results. The mohr-Coulomb model is chosen for this study because it is commonly used. Based on the results throughout this study, it can be concluded the simulation using the Mohr-Coulomb model of PLAXIS software gives good results for representing the unconfined compression test, so that for soft clay, the ratio between modulus of elasticity and cohesion is equal to (Eu = 30 cu) for remolded clay and (Eu = 55 cu) for undisturbed clay. While for stiff clay, it was equal (Eu = 65 cu) for remolded and (Eu = 120 cu) for undisturbed clay. The modulus of elasticity for the undisturbed is higher than for remolded clay, so the difference is almost double in the case of stiff clay. The lateral confining pressure affects the modules of soil; however, for soft clay, the range of soil modulus in the case of the drained test was (5 to 25 MPa), while the range is higher for the undrained case (18 to 54 MPa). Moreover, for stiff clay, the range was equal (11 to 100 MPa) for a drained test and between (18 to 100 MPa) for an undrained case.

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Mailyan, D. R., and G. V. Nesvetaev. "RIGIDITY AND STRENGTH ANALYSIS OF REINFORCED CONCRETE BEAMS BY VARYING ELASTICITY MODULUS." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture, no. 4 (August 29, 2018): 86–93. http://dx.doi.org/10.31675/1607-1859-2018-20-4-86-93.

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Relevance: The actual values of the elastic modulus used for manufacturing reinforced concrete products and concrete structures may differ significantly from those given in SNiP 63.13330. It is therefore interesting to estimate the rational value of the elasticity modulus of concrete for a particular design. Purpose: Calculation algorithm is proposed for normal stresses and deformations based on variation of the elasticity modulus of concrete by controlling prescribed and technological factors. Materials and methods: Ordinary concrete grades up to В120 grade with organic and mineral modifiers, reinforced concrete beams, modeling, numerical experiment, beam analysis by normal stresses and deformations. Results: The proposed beam analysis algorithm considers a possible change up to 2 times in the elasticity modulus of concrete. Conclusions: Calculations of the elasticity modulus ensure the beam rigidity, taking into account its reinforcement and cross-sectional parameters and strength for normal stresses at a concrete strength normalization corresponding to the elastic modulus, with regard to prescribed and technological factors.

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Rahman, Md Rezaur, Sinin Hamdan, M. Saiful Islam, and Md Shahjahan Mondol. "Mechanical Properties and Decay Resistance of Wood Polymer Composites (WPC)." Advanced Materials Research 264-265 (June 2011): 819–24. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.819.

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In Malaysia, especially Borneo Island Sarawak has a large scale of tropical wood species. In this study, selected raw tropical wood species namely Artocarpus Elasticus, Artocarpus Rigidus, Xylopia Spp, Koompassia Malaccensis and Eugenia Spp were chemically treated with sodium meta periodate to convert them into wood polymer composites. Manufactured wood polymer composites were characterized using mechanical testing (modulus of elasticity (MOE), modulus of rupture (MOR), static Young’s modulus) and decay resistance test. Modulus of elasticity and modulus of rupture were calculated using three point bending test. Static Young’s modulus and decay resistance were calculated using compression parallel to gain test and natural laboratory decay test respectively. The manufactured wood polymer composites yielded higher modulus of elasticity, modulus of rupture and static Young’s modulus. Wood polymer composite had high resistant to decay exposure, while Eugenia Spp wood polymer composite had highly resistant compared to the other ones.

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Couto Aguiar, Letícia, Luiz A. Melgaço N. Branco, Eduardo Chahud, et al. "Influence of Time Evolution in the Modulus of Elasticity of Concrete Reinforced by Carbon Fibers." Advanced Materials Research 1088 (February 2015): 640–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.640.

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The modulus of elasticity is an important property for the behavior analysis of concrete structures. This research evaluated the strain difference between concrete specimens with and without the application of laminate carbon fiber composites as well as the variation time, in months, of the axial strength compression and modulus of elasticity. Through the experimental results, it is concluded that increases in compressive strength and modulus of elasticity are more significant in the specimens without reinforcement.

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Chegenizadeh, Amin, and Hamid Nikraz. "Modulus of Elasticity of Reinforced Clay." Advanced Materials Research 261-263 (May 2011): 969–73. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.969.

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Reinforced soil has been among the most effective soil modification materials. Its use has been expanded rapidly into civil engineering, geotechnical engineering and pavement engineering. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fibre inclusion on the modulus of elasticity of subgrade material. Plastic fibre was used for this investigation. Fibre contents and aspect ratio have been changed during these tests. The fibre percentage varied from 0 % (for unreinforced samples) to 3%. Clay was used as sub grade material. Unconfined compression tests were carried out to investigate behaviour of the composite under different condition. The fibre length and fibre content found to play important rule on the modulus of elasticity of fibre. Furthermore it was observed that ductility of sample increased by fibre inclusion.

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Tampi, R., H. Parung, R. Djamaluddin, and A. Amiruddin. "Elasticity modulus concrete of abaca fiber." IOP Conference Series: Earth and Environmental Science 473 (May 14, 2020): 012146. http://dx.doi.org/10.1088/1755-1315/473/1/012146.

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Smardzewski, Jerzy, Wojciech Lewandowski, and Hasan Özgür İmirzi. "Elasticity modulus of cabinet furniture joints." Materials & Design 60 (August 2014): 260–66. http://dx.doi.org/10.1016/j.matdes.2014.03.066.

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Aerens, Richard, Vitalii Vorkov, and Joost R. Duflou. "Springback prediction and elasticity modulus variation." Procedia Manufacturing 29 (2019): 185–92. http://dx.doi.org/10.1016/j.promfg.2019.02.125.

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Zhang, Shi Min, Kai Yu, Zhi Ding, and Hao Miao Yang. "Research on the Factors Affect the Settlement of Soft Pile in Double-Layered Foundation." Advanced Materials Research 163-167 (December 2010): 4512–19. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4512.

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The pile work on the complex properties of three-dimensional finite element analysis has been made by building-up one 4x4 soft pole. Having studied on the factors which affect the flexibility pole compound foundation settlement factor in foundation, include the level of vertical load, elastic modulus of the pile, cushion thickness and elastic modulus. The results show that: the impact of soft pile settlement of the factors, the level of vertical load and pile elastic modulus greater impact cushion modulus of elasticity and thickness of the less affected. As for the pole body elasticity modulus and the bed course elasticity modulus, the compound foundation existence is controlled give value preferential treatment most subsides, the bed courses among them almost can be ignored since effect is less.

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Tatarciuc, Monica, Anca Vitalariu, Odette Luca, et al. "The Influence of Food Consistency on the Abutment Teeth in Fixed Prostheses A FEA study." Revista de Chimie 69, no. 2 (2018): 407–9. http://dx.doi.org/10.37358/rc.18.2.6117.

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The aim of our study was to evaluate through Finite Elements Analysis (FEA), the stress induced into the abutments and into a metallic bridge by an alimentary bolus of different consistency. Research was carried using the FEA on a model of the bridge with full crowns as retainers in the posterior teeth (34-36), obtained using a contact scanner and computer aided design (CAD) system. We surveyed the stress induced by different food consistency with elasticity modulus between 0 MPa and 60000 MPa. A 6MPa stress was induced by the bridge when the elasticity modulus was equal to 200 MPa. For the maximal value of the elasticity modulus, the stress was 13.68Mpa. The highest values of stresses are registered for the maximal values of the elasticity modulus.

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Liu, Jide, Xiaoming Du, Xue Wang, et al. "First-Principles Calculations of Elasticity Properties of AgW₂₀ Alloy." Journal of Physics: Conference Series 2459, no. 1 (2023): 012008. http://dx.doi.org/10.1088/1742-6596/2459/1/012008.

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Abstract In this paper, the first-principles calculations based on DFT were employd to investigate the elasticity characteristics of AgW20 alloy. The elasticity constants of the single crystals are calculated using the finite strain method and Voigt – Reuss – Hill (VRH) approach. The universal anisortropic index (AU ), shear anisortropic index, orientation dependency of Young’s modulus, bulk modulus were used to characterize elasticity anisortropy behaviors. The calculated elasticity properties of AgW20 alloy show a remarkable elasticity anisortropy for AgW20 alloy.

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Sözen, Eser. "Determination of Physical and Mechanical Properties of Waste Paper Boards Supported by Wood Chips and Chopped E-glass Fiber." Drvna industrija 73, no. 4 (2022): 486–94. http://dx.doi.org/10.5552/drvind.2022.2145.

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Today, legal regulations, along with social awareness, have made waste management a necessity. Depending on the type of waste, technological developments have enabled an increase in the number of approaches, e.g., reusing, recycling, and manufacturing of different products. In this study, low-density boards were produced using different proportions of office waste paper, wood chips, and chopped E-glass fiber. Waste paper and glass fiber formed the middle layer of the boards and wood chips comprised the surface layers. The density, water absorption, and thickness swelling properties of the boards were investigated. Among the mechanical properties, the modulus of rupture, modulus of elasticity, and internal bond strength were determined. The use of wastepaper led to a reduction in the modulus of rupture and modulus of elasticity of the boards. An increase in the glass fiber ratio contributed positively to the water absorption and thickness swelling properties, whereas it directly led to decreases in the internal bond strength, and the modulus of rupture and modulus of elasticity values. Nonetheless, the low-density boards were able to meet the minimum modulus of rupture and modulus of elasticity specified in ANSI 208.1 standards, while only one variation met the IB requirements.

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Irie, Masao, Masahiro Okada, Yukinori Maruo, Goro Nishigawa, and Takuya Matsumoto. "Shear Bond Strength of Resin Luting Materials to Lithium Disilicate Ceramic: Correlation between Flexural Strength and Modulus of Elasticity." Polymers 15, no. 5 (2023): 1128. http://dx.doi.org/10.3390/polym15051128.

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This study investigates the effect of the curing mode (dual-cure vs. self-cure) of resin cements (four self-adhesive and seven conventional cements) on their flexural strength and flexural modulus of elasticity, alongside their shear bond strength to lithium disilicate ceramics (LDS). The study aims to determine the relationship between the bond strength and LDS, and the flexural strength and flexural modulus of elasticity of resin cements. Twelve conventional or adhesive and self-adhesive resin cements were tested. The manufacturer’s recommended pretreating agents were used where indicated. The shear bond strengths to LDS and the flexural strength and flexural modulus of elasticity of the cement were measured immediately after setting, after one day of storage in distilled water at 37 °C, and after 20,000 thermocycles (TC 20k). The relationship between the bond strength to LDS, flexural strength, and flexural modulus of elasticity of resin cements was investigated using a multiple linear regression analysis. For all resin cements, the shear bond strength, flexural strength, and flexural modulus of elasticity were lowest immediately after setting. A clear and significant difference between dual-curing and self-curing modes was observed in all resin cements immediately after setting, except for ResiCem EX. Regardless of the difference of the core-mode condition of all resin cements, flexural strengths were correlated with the LDS surface upon shear bond strengths (R2 = 0.24, n = 69, p < 0.001) and the flexural modulus of elasticity was correlated with them (R2 = 0.14, n = 69, p < 0.001). Multiple linear regression analyses revealed that the shear bond strength was 17.877 + 0.166, the flexural strength was 0.643, and the flexural modulus was (R2 = 0.51, n = 69, p < 0.001). The flexural strength or flexural modulus of elasticity may be used to predict the bond strength of resin cements to LDS.

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43

Gold, Lorne W. "On the elasticity of ice plates." Canadian Journal of Civil Engineering 15, no. 6 (1988): 1080–84. http://dx.doi.org/10.1139/l88-140.

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The rigidity modulus is determined for simply supported, circular ice plates 0.5 and 1.22 m in diameter. Measurements for the 0.5 m diameter plates were made at −10 °C and for the 1.22 m plates in the range of −7 to −37 °C. The elastic moduli and Poisson's ratio, calculated from the rigidity modulus, are in the range of 6.0–12.0 GPa and 0.29–0.60 respectively, depending on ice type, temperature, and grain size. The plate characteristic lengths calculated from the measured values of the elastic moduli are compared with characteristic lengths determined from field measurements of the deflection of ice covers under load. Key words: ice, ice cover, rigidity modulus, elastic modulus, Poisson's ratio.

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Purwanto, Amanda, and Abdul Ro’uf. "Sistem Pengukuran Modulus Elastisitas Beton Menggunakan Metode Ultrasonic Pulse Velocity." IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 8, no. 1 (2018): 25. http://dx.doi.org/10.22146/ijeis.30978.

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Modulus of elasticity of concrete usually measured by Destructive Testing which is not considered as an effective way, because It will destroy the concrete. Ultrasonic Pulse Velocity can be a solution to measure value of modulus of elasticity without destructing it. The concept of the system is to look for velocity of wave, then put the value into modulus elasticity formula.UPV system will transmit ultrasonic wave through concrete. HC-SR04 used for generating 40 kHz wave, increasing voltage of wave on receiver, and calculating time travel. The voltage of wave sent by HC-SR04 is only about 10 volt, so that power and voltage of wave has to be amplified. Piezoelectric is used as a transducer which can converts electrical to mechanical energy. The results of this research shows that error value on wave velocity measurement have an average value for about 18,2% compared to result of UPV Pundit. Static modulus of elasticity from compressive test is compared to value of dynamic modulus of elasticity that is obtained by UPV system with HC-SR04. Ratio between two values is about 45% - 249%.

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Kim, Wonchang, Keesin Jeong, Taegyu Lee, and Sungyu Park. "A Study on Correlation between Ultrasonic Pulse Velocity Method and Coarse Aggregate for Estimating Residual Modulus of Elasticity of Concrete Exposed to High Temperatures." Applied Sciences 12, no. 13 (2022): 6644. http://dx.doi.org/10.3390/app12136644.

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In this study, the mechanical properties of normal concrete (NC) and lightweight concrete (LC) were measured upon exposure to high temperatures (20, 100, 200, 300, 500, and 700 °C). Then, analysis was conducted to predict the residual modulus of elasticity through ultrasonic pulse velocity. Crushed granite aggregate was mixed as the coarse aggregate for NC and coal-ash aggregate for LC. The effect of the water-to-binder (W/B) ratio (0.41, 0.33, and 0.28) on the mechanical properties (residual compressive strength, residual ultrasonic pulse velocity, residual modulus of elasticity, and stress–strain) of concrete was determined. The residual compressive strength, residual ultrasonic pulse velocity, and residual modulus of elasticity were higher for LC compared to NC. The correlation between the ultrasonic pulse velocity and residual modulus of elasticity was also analyzed, which yielded a high correlation coefficient (R2) at all levels. Finally, equations for predicting the residual modulus of elasticity using ultrasonic pulse velocity with R2 values of 0.94 and 0.91 were proposed for NC and LC, respectively.

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Cimbola, Zdravko, Anđelko Crnoja, Ivana Barišić, and Ivanka Netinger Grubeša. "Evaluation of the Applicability of Waste Rubber in Insulation Panels with Regard to Its Grain Size and Panel Thickness." Materials 17, no. 21 (2024): 5251. http://dx.doi.org/10.3390/ma17215251.

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This paper explores the effect of waste rubber grain size on the porosity, modulus of elasticity, thermal properties, and soundproofing performance of polymer composites with different thicknesses (10, 15, and 20 mm). All properties were tested in accordance with European standards, with the exception of porosity, which was measured using Archimedes’ principle. The findings indicate that with a consistent amount of polyurethane glue, finer rubber grains result in composites with higher porosity, leading to a lower modulus of elasticity but enhanced thermal and sound insulation. In contrast, coarser rubber grains produced composites with lower porosity and a higher modulus of elasticity, though with slightly reduced thermal insulation and significantly worse soundproofing. A combination of fine and coarse rubber grains provided a balanced performance, offering both good thermal and sound insulation while maintaining a high modulus of elasticity. Among the thicknesses tested, 15 mm was identified as optimal, combining a relatively high modulus of elasticity, low thermal conductivity, and better airborne sound insulation index. Future research will focus on applying this composite in concrete building products that meet noise protection and energy efficiency standards.

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Hans, Marcus, Lena Patterer, Denis Music, et al. "Stress-Dependent Elasticity of TiAlN Coatings." Coatings 9, no. 1 (2019): 24. http://dx.doi.org/10.3390/coatings9010024.

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We investigate the effect of continuous vs. periodically interrupted plasma exposure during cathodic arc evaporation on the elastic modulus as well as the residual stress state of metastable cubic TiAlN coatings. Nanoindentation reveals that the elastic modulus of TiAlN grown at floating potential with continuous plasma exposure is 7%–11% larger than for coatings grown with periodically interrupted plasma exposure due to substrate rotation. In combination with X-ray stress analysis, it is evident that the elastic modulus is governed by the residual stress state. The experimental dependence of the elastic modulus on the stress state is in excellent agreement with ab initio predictions. The macroparticle surface coverage exhibits a strong angular dependence as both density and size of incorporated macroparticles are significantly lower during continuous plasma exposure. Scanning transmission electron microscopy in combination with energy dispersive X-ray spectroscopy reveals the formation of underdense boundary regions between the matrix and TiN-rich macroparticles. The estimated porosity is on the order of 1% and a porosity-induced elastic modulus reduction of 5%–9% may be expected based on effective medium theory. It appears reasonable to assume that these underdense boundary regions enable stress relaxation causing the experimentally determined reduction in elastic modulus as the population of macroparticles is increased.

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Jeżo, Aleksandra, and Grzegorz Kowaluk. "Compression strength and other mechanical properties of particleboards induced by density." Annals of WULS, Forestry and Wood Technology 110 (June 30, 2020): 79–91. http://dx.doi.org/10.5604/01.3001.0014.4413.

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Compression strength and other mechanical properties of particleboards induced by density. The aim of the paper was to investigate the contractual compression strength and modulus of elasticity under compression of six types of commercially available particleboards of various thickness, density and surface finish. The basic mechanical and physical characteristics of the tested panels (modulus of elasticity and modulus of rupture during bending, density and density profile) were also performed. The studies showed that the compression strength raises linearly with panels’ density raise, and the modulus of elasticity under compression is linearly opposite, depending on the panels’ density.

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Pramono, Agus Edy, Yohannes Patrick, Aminudin Zuhri, et al. "The investigation of the properties of filaments fabricated from carbon biomass and LLDPE." Jurnal Polimesin 22, no. 4 (2024): 410. http://dx.doi.org/10.30811/jpl.v22i4.5084.

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This study aims to develop composites using electrically conductive carbon and polymer polyethylene (LLDPE) to enhance electrical conductivity. Investigations have been conducted on the fabrication of electrically conductive composites and the modulus of elasticity through heat compaction using mixtures of carbon-LLDPE powders. Heat compaction is performed at temperatures ranging from 120°C to 150°C, with varying composition ratios of carbon-LLDPE, including 50:50, 60:40, and 70:30 % wt. Higher proportions of carbon and compaction temperatures are correlated with increased electrical conductivity. For instance, the C7-3LLDPE composite, compacted at 150°C, demonstrates the highest electrical current flow of 0.0018 A, whereas the C5-5LLDPE composite, compacted at 135°C, exhibits the lowest current flow at 0.0000638 A. Regarding the modulus of elasticity, the composition ratio of C7-3LLDPE, compacted at 120°C, achieves the highest value at 2686.43 [N/mm2 ]. Conversely, the composition ratio of C5-5LLDPE, compacted at 135°C, yields the lowest modulus of elasticity at 1530.94 [N/mm2 ]. Elasticity modulus testing follows the ASTM D638 standard, with a speed of 2 mm/min. It is observed that increasing the compaction temperature results in a decreased modulus of elasticity across all composition ratios. Furthermore, a higher carbon content within the composite corresponds to a higher modulus of elasticity, regardless of the compaction temperature.

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Wang, Ping, Hao Xu, Rong Chen, Jingmang Xu, and Xiaohui Zeng. "Experimental Research on Compression Properties of Cement Asphalt Mortar due to Drying and Wetting Cycle." Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/769248.

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Uniaxial compression test of cement asphalt (CA) mortar specimens, due to drying and wetting cycle of 0, 2, 4 and 8 times, is carried out by using the electronic universal test machine, with the strain rate ranging from 1 × 10−5 s−1to 1 × 10−2 s−1. The effects of strain rate and drying and wetting cycle time on the compressive strength, elasticity modulus, and stress-strain full curve are investigated. Experimental results show that the strain-stress full curve of CA mortar is affected obviously by strain rate and drying and wetting cycle time. The compressive strength and elasticity modulus increase with the strain rate under the same drying and wetting cycle time. The compressive strength and elasticity modulus decrease with the increase of drying and wetting cycle time in the same strain rate. The lower the strain rate is, the greater the compressive strength and elasticity modulus of CA mortar decrease. When the strain rate is 1 × 10−5 s−1and drying and wetting cycle time is 8, the largest reduction of average compressive strength of CA mortar is 40.48%, and the largest reduction of elasticity modulus of CA mortar is 35.51%, and the influence of drying and wetting cycle on the compressive strength of CA mortar is greater than its influence on the elasticity modulus.

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Journal articles on the topic 'Modulus elasticity'

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