Academic literature on the topic 'Dynamic modulus of elasticity'

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Journal articles on the topic "Dynamic modulus of elasticity"

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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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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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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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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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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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Prošek, Zdeněk, and Jaroslav Topič. "LONG-TIME INVESTIGATION OF CEMENT COMPOSITE MATERIAL WITH MICRONIZED WASTE MARBLE POWDER: DYNAMIC MODULES." Acta Polytechnica CTU Proceedings 13 (November 13, 2017): 93. http://dx.doi.org/10.14311/app.2017.13.0093.

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This article focus on “blended cement”. The blended cement was created by using waste marble powder (WMP) as a partial replacement for cement. We investigated the influence of WMP on the developing of the dynamic modulus of elasticity and the dynamic shear modulus in time. Four different cement composites with WMP as a partial replacement for cement were studied (5, 10, 15 and 50 wt. %) together with reference samples. Dynamic modulus of elasticity was monitored during the first 377 days since manufacture by use of non-destructive testing (resonance method). The results showed that WMP in a small amount had a no effect on the dynamic modulus of elasticity and the dynamic shear modulus.
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OVSYANNIKOV, S. N., O. V. LELYUGA, A. S. SAMOKHVALOV, E. A. LYMAREVA, and T. S. BOLSHANINA. "EXPERIMENTAL STUDIES OF ELASTIC-DISSIPATIVE PROPERTIES OF STRUCTURAL AND SEALING MATERIALS OF TRANSLUCENT STRUCTURES." Building and reconstruction 104, no. 6 (2022): 56–68. http://dx.doi.org/10.33979/2073-7416-2022-104-6-56-68.

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The analytical solution of the problem of sound and vibration passage through structures and joints requires determining the elastic-dissipative properties of structural and sealing materials of translucent structures: the dynamic modulus of elasticity and loss factor. In this paper, the parameters of the dynamic modulus of elasticity and loss coefficient of some well-known building materials are investigated and experimentally established in comparison with previously obtained data from other authors. To automate and accurately measure the coefficient of dynamic characteristics of materials, a measurement technique was used, using Zetlab software and measuring equipment. When measuring the dynamic modulus of elasticity of sealing materials, LDS measuring equipment was used. The refined values obtained for the dynamic modulus of elasticity and the loss factor of materials allow them to be used in vibroacoustic calculations of translucent structures.
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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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Zhang, Junzhi, Yueming Wang, Xixi Li, Yurong Zhang, and Lingjie Wu. "Enhancing Concrete Mechanical Properties through Basalt Fibers and Calcium Sulfate Whiskers: Optimizing Compressive Strength, Elasticity, and Pore Structure." Materials 17, no. 7 (2024): 1706. http://dx.doi.org/10.3390/ma17071706.

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To study the effects of basalt fibers (BFs), calcium sulfate whiskers (CSWs), and modified calcium sulfate whiskers (MCSWs) on the compressive strength and dynamic modulus of elasticity of concrete, this paper utilizes Mercury Intrusion Porosimetry (MIP) to measure the microstructure of concrete and calculate the fractal dimension of pore surface area. The results indicate that both CSWs and BFs can increase the compressive strength of concrete. CSWs can enhance the dynamic modulus of elasticity of concrete, while the effect of BFs on the dynamic modulus of elasticity is not significant. The improvement in compressive strength and dynamic modulus of elasticity provided by MCSWs is significantly greater than that provided by CSWs. Both CSWs and BFs can effectively improve the pore structure of concrete and have a significant impact on the surface fractal dimension. CSWs inhibit the formation of ink-bottle pores, while BFs increase the number of ink-bottle pores. Due to the ink-bottle pore effect, the fractal dimension of the capillary pore surface is generally greater than three, lacking fractal characteristics. The compressive strength and dynamic modulus of elasticity of concrete have a good correlation with the fractal dimensions of large pores and transition pores.
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Li, Zhong Hua, Hui Xu, Chao Su, Duo Zheng, and Jia Liang Yang. "Effect of Water-Binder Ratio and Mineral Admixture on Frost Scaling Resistance of Concrete." Advanced Materials Research 881-883 (January 2014): 1212–15. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1212.

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In order to increase freeze-salt scaling resistance of concrete, effect of water-binder ratio, fly ash, slag and silica fume on freeze-salt scaling resistance are researched according to the CDF method. The results show that the scaled mass and the dynamic modulus of elasticity loss rate of the concrete are reduced with decreasement of water-binder ratio. When mineral admixture compound is added into concrete the scaled mass and the dynamic modulus of elasticity loss rate are also reduced. Compared with fly ash and slag the trend is more obvious as result of fume and slag added. The scaled mass and the loss rate of dynamic elasticity modulus are slightly reduced with decreasement of fly ash and slag. But the scaled mass and the loss rate of dynamic elasticity modulus are obviously reduced with increasement of silica fume and slag.
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Dissertations / Theses on the topic "Dynamic modulus of elasticity"

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Waghorn, Matthew J. "Effect of initial stand spacing and breed on dynamic modulus of elasticity of Pinus radiata." Thesis, University of Canterbury. Forestry, 2006. http://hdl.handle.net/10092/1129.

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Wood stiffness or modulus of elasticity (MOE) is one of the most important wood properties for solid timber applications, and as such, the efficacy of wood use, especially for structural timber is strongly related to MOE. MOE in Pinus radiata is highly variable and poorly understood. In this study, the effect of initial stand spacing and breed on outerwood MOE and the vertical distribution of MOE of Pinus radiata was assessed. Understanding positive or negative influences of growth caused by initial stand spacing and genetic material on MOE is appealing because it could enable us to better comprehend how forest growers could adapt silvicultural operations to the demands of wood processing. Physical characteristics of different breeds and propagation methods of Pinus radiata were assessed at a variety of initial stand spacings. Stem diameter, crown height, stem slenderness and branch size were all heavily influenced by stand spacing. Breed had a marginally significant influence on diameter and stem slenderness. Internode length was not affected by stand spacing, but showed sizeable differences, especially between the long internode 870 breed and the remaining growth and form (GF) breeds. Outerwood MOE was significantly (P<0.0001) influenced by stand spacing and breed, but not their interaction (P>0.05). MOE scaled positively with stand spacing. MOE increased by 39% from 5.4 GPa at 209 stems ha-1 to 7.5 GPa at 2551 stems ha-1. The majority of this increase (33%) occurred between 209 and 835 stems ha-1. Physiologically aged cuttings of greater maturation status exhibited greater MOE, with the three-year-old cuttings being stiffer than the one-year-old cuttings, seedlings from the 870, 268 and 850 series, by 15, 17, 22 and 27%, respectively. Stem slenderness exhibited the strongest significant (P<0.0001) relationship with MOE (r2=0.49), followed by green crown height (r2=0.46) and diameter (r2=0.44). Stem slenderness and green crown height had a direct influence on MOE that explained 53% of the variance in MOE. MOE was also significantly (P<0.0001) influenced by spacing and breed when using the resonance technique to assess whole stem MOE. The vertical distribution of MOE showed that the lowest portion of the stem (bolt 1) was approximately 30% less stiff than bolts 2 and 3. After the greatest MOE value had been obtained at bolt 3, MOE gently declined to the top of the measured stem. Variation of MOE within trees was significant (58%) at the high stockings of 1457 and 2551 stems ha-1, but somewhat lower (36%) at the lower stockings. The 870 breed was approximately 8% and 16% stiffer than the 268 and 850 breeding series respectively, across all stockings, with the three-year-old cuttings being 7% stiffer than the one-year-old cuttings. At stockings of 481 stems ha-1 and less, the proportional height at which MOE was greatest within a tree was between 25% and 50% of stem height. At stockings above 481 stems ha-1 the proportional height at which maximum MOE was obtained was between 15% and 40% of stem height. Bolt slenderness was found to be the most significant factor impacting on MOE of the bolt. Regression of critical buckling height against diameter at ground level yielded a scaling exponent of 0.55, which was lower than the scaling exponent of 0.67 predicted with constant density-specific stiffness. There was a tendency for some bolts with lower mean diameter to display significantly higher safety margins than bolts with higher mean diameter, suggesting that the largest bolts, which occur at the base of tree, are the point of most likely critical failure.
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Kocáb, Dalibor. "Experimentální stanovení faktorů ovlivňujících statický modul pružnosti betonu s využitím nedestruktivních zkušebních metod." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-355639.

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The Ph.D. thesis deals with one of the most important characteristics of hardened concrete; i.e. the modulus of elasticity. The thesis aims to describe and evaluate the important factors that affect the final value of concrete modulus of elasticity, especially those that can be influenced during construction. Another aim is to find ways to determine the static modulus of elasticity of concrete by non-destructive means (primarily ultrasonic pulse method, resonance method and use of electronic rebound hammers), thus to determine the possibility of creating calibration curve for NDT determination of the modulus of elasticity.
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Engström, Anders, and Toma Sumbasacu. "The length effect on Norway spruce boards : An investigation on indicating properties based on axial dynamic and edgewise bending MOEs." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-49099.

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When using timber for construction purposes it is important to know its strength. One way to do this is by sorting the boards into strength classes that are defined by European standards.  A commonly used method for strength grading is based on dynamic excitation in the longitudinal direction of the board to obtain an average dynamic longitudinal modulus of elasticity (MOE). This in turn correlates with the bending strength of the board in such a way that it can be used as an indicating property (IP) to bending strength. The use of MOE as an IP has proven to give the highest coefficient of determination (R2) to both bending and tensile strength in boards. Through the research described in this thesis, one might find that both reducing the length of a board to half its initial length and by removing the part containing the lowest local MOE in edgewise bending provided similar results, the axial dynamic MOE remaining within a 1% tolerance whereas the lowest IP based on local MOE in edgewise bending increased by 6–7%.
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Kocuba, Robert. "Diagnostika a hodnocení prefabrikované železobetonové konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372269.

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This thesis deals with inspection and constructionally technical research of reinforced concrete prefabricated construction from the second half of 20th century. In theoretical part, the research of literature, documents and valid standards is performed, with a focus on production and construction of prefabricated elements and also on the metodology of research. In practical part, the detection of reinforcement of individual elements of the construction and concrete properties is performed. The result of this work is the assessment of the state of the construction, static calculation of the ceiling panel and idea proposal for eventual reconstruction.
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Valentová, Renata. "Zjišťování dynamických modulů cihelného střepu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225668.

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This master’s thesis deals with the determination of dynamic modulus of elasticity non-destructive methods of brick body. The test samples were laboratory-made from two types of brick earth and further were used cotouts from the full brick types clinker. For measuring were used ultrasonic impulse and resonant-impact method.
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Tichý, Aleš. "Vliv velikosti a tvaru zkušebního tělesa na modul pružnosti lehkých betonů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391974.

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The diploma thesis deals with the determination of the influence of size, shape and type of test specimen on values of modulus of elasticity of light-weight concrete. A lot of different specimens were prepared from two concrete’s mixtures for the experiment. Tests for measurement of static modulus of elasticity and dynamic modulus of elasticity by ultrasonic impulse velocity method were made. The results were assessed and summarized in tabular and graphical form.
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Halamová, Romana. "Problematika zjišťování statického modulu pružnosti betonu v konstrukcích." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265362.

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The thesis deals with the measurement of the elastic modulus of concrete in existing structures and possibilities of applicability of equations for the calculation of characteristic values of concrete compressive strength on the modulus of elasticity. The modulus of elasticity is determined by dynamic and static methods on specimens taken from the concrete blocks, whose composition varies by a water cement ratio and varying amounts of admixtures. In conclusion, the results of the measurements are compared and the characteristic values of the modulus of elasticity is determined.
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Wiberg, Johan. "Bridge Monitoring to Allow for Reliable Dynamic FE Modelling : A Case Study of the New Årsta Railway Bridge." Licentiate thesis, KTH, Civil and Architectural Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3897.

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<p>Today’s bridge design work in many cases demands a trustworthy dynamic analysis instead of using the traditional dynamic amplification factors. In this thesis a reliable 3D Bernoulli-Euler beam finite element model of the New Årsta Railway Bridge was prepared for thorough dynamic analysis using in situ bridge monitoring for correlation. The bridge is of the concrete box girder type with a heavily reinforced and prestressed bridge deck. The monitoring system was designed for long term monitoring with strain transducers embedded in the concrete and accelerometers mounted inside the edge beams and at the lower edge of the track slab.</p><p>The global finite element model used the exact bridge geometry but was simplified regarding prestressing cables and the two railway tracks. The prestressing cables and the tracks were consequently not included and an equivalent pure concrete model was identified.</p><p>A static macadam train load was eccentrically placed on one of the bridge’s two tracks. By using Vlasov’s torsional theory and thereby including constrained warping a realistic modulus of elasticity for the concrete without prestressing cables and stiffness contribution from the railway tracks was found. This was allowed by comparing measured strain from strain transducers with the linear elastic finite element model’s axial stresses. Mainly three monitoring bridge sections were used, each of which was modelled with plane strain finite elements subjected to sectional forces/moments from a static macadam train load and a separately calculated torsional curvature.</p><p>From the identified modulus of elasticity the global finite element model was updated for Poisson’s ratio and material density (mass) to correspond with natural frequencies from the performed signal analysis of accelerometer signals. The influence of warping on the natural frequencies of the global finite element model was assumed small and the bridge’s torsional behaviour was modelled to follow Saint-Venant’s torsional theory.</p><p>A first preliminary estimation of modal damping ratios was included. The results indicated that natural frequencies were in accordance between modelling and signal analysis results, especially concerning high energy modes. Estimated damping ratios for the first vibration modes far exceeded the lower limit value specified in bridge design codes and railway bridge dynamic analysis recommendations.</p>
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Bizet, Laurent. "Caractérisation et modélisation du comportement thermomécanique des matériaux métalliques : vers la prise en compte des hétérogénéités micro-structurales intrinsèques." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAA001/document.

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La prédiction de la géométrie d'une pièce mise en forme par déformation plastique grâce à un logiciel de calcul par éléments finis (EF) s'effectue en suivant séquentiellement différentes étapes : la caractérisation thermo-mécanique du matériau, la modélisation de son comportement et son intégration dans un logiciel EF, puis la mise en données et la simulation de l'opération de formage. La phase de modélisation consiste entre autre à identifier quel type de modèle de comportement est le plus approprié pour prédire les réactions du matériau lors de l'opération de formage. Ces modèles sont essentiellement développés dans le cadre de la mécanique des milieux continus (MMC). L'hypothèse forte, si ce n'est centrale, de la MMC consiste à considérer que les variables qui servent à déterminer le comportement du matériau sont continues et dérivables. Cependant, les connaissances les plus élémentaires de métallurgie indiquent que les grandeurs locales dans les matériaux métalliques sont discontinues. La majorité des modèles de comportement mécanique des matériaux métalliques repose sur la définition d'un volume élémentaire représentatif dont la taille est assez grande pour permettre une homogénéisation de la description du comportement en gommant l'influence des hétérogénéités localesL'objet de ces travaux est de montrer que la prise en compte des hétérogénéités locales dans la modélisation du comportement des matériaux métalliques est pertinente et contribue à l'amélioration de la prédiction des simulations d'opérations de mise en forme en élargissant le potentiel prédictif des modèles ainsi construits. Un modèle élasto-plastique prenant en compte les hétérogénéités locales est alors proposé<br>To obtain a relevant shape of a formed part during its finite element simulation, several steps are needed: thermo-mechanical caracterization of the material, definition of the most relevant model and integration of this model in the FE software and finally after data converting and computing processes. The modelling step include, among other things, the identification of the most appropriate model to fit the experimental material behaviour. Those models are essentially developped within the framework of continuum mechanics (CM). A strong, if not the main assumption of the CM consists in considering that mechanical description variables are continuous and differentiable. However, the basic knowledge of metallurgy indicates that local data in metallic materials are discontinuous. For metallic materials, the majority of constitutive models are based on the definition of a representative elementary volume (REV). This REV is supposed to be large enough to erase the incidence of local heterogeneities. Then those constitutive models are assumed to be homogeneous.The aim of this work is to show that introducing local heterogeneities in the description of constitutive models is relevant and contribute to improve the simulation accuracy. Those models also provide an enlargement of the simulation predictive potential. Then an elasto-plastic model, based on local heterogeneities description, is proposed
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Sousa, Fernando Henrique Fernandes. "Avaliação da relação entre os módulos de elasticidade estático e dinâmico de concretos produzidos com agregados graúdos reciclados em substituição aos agregados graúdos naturais." Universidade do Vale do Rio dos Sinos, 2018. http://www.repositorio.jesuita.org.br/handle/UNISINOS/7170.

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Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2018-08-16T13:06:28Z No. of bitstreams: 1 Fernando Henrique Fernandes Sousa_.pdf: 2658604 bytes, checksum: e7b64f91760b00255d2c12f5440cf17d (MD5)<br>Made available in DSpace on 2018-08-16T13:06:28Z (GMT). No. of bitstreams: 1 Fernando Henrique Fernandes Sousa_.pdf: 2658604 bytes, checksum: e7b64f91760b00255d2c12f5440cf17d (MD5) Previous issue date: 2018-05-28<br>Nenhuma<br>O módulo de elasticidade é um parâmetro que mensura a rigidez do concreto, sendo uma das propriedades que é levada em consideração na verificação da segurança estrutural, pois expressa as condições dos estados limites último e de serviço. Quando é avaliada - a influência da substituição de agregados graúdos naturais por agregados graúdos reciclados - o comportamento elástico do concreto torna-se imprescindível, uma vez que não é similar ao comportamento de resistência à compressão, que por sua vez pode alcançar resistências superiores ao concreto produzido inteiramente com agregados graúdos naturais. Nesse sentido, o uso da resistência à compressão como parâmetro único, para se estimar o módulo de elasticidade do concreto produzido com agregados graúdos reciclados, tem sido cada vez mais questionável. Tratando-se da influência do uso de agregado graúdo reciclado no módulo de elasticidade do concreto, poucos são os estudos que apresentam os valores de módulo de elasticidade estático e módulo de elasticidade dinâmico. Diante disso, o objetivo desta pesquisa é avaliar a relação entre o módulo de elasticidade estático e o módulo de elasticidade dinâmico de concretos produzidos com agregados graúdos reciclados em substituição aos agregados graúdos naturais, com o intuito de relacionar o tipo de agregado graúdo ao módulo de elasticidade. Para tal, foram utilizados agregados graúdos reciclados de concreto e agregados graúdos reciclados de cerâmica vermelha em taxa de substituição de 30% em relação ao agregado graúdo natural. Os concretos foram produzidos em três traços experimentais, sendo eles: traço pobre (maior relação a/c), traço intermediário e traço rico (menor relação a/c). As propriedades dos concretos foram avaliadas aos 28 dias, sendo elas: massa específica do concreto no estado fresco e endurecido; porosidade; resistência à compressão; módulos de elasticidade estático e dinâmico. Como principais resultados, verificou-se que o tipo de agregado graúdo reciclado de modo geral influenciou negativamente o módulo de elasticidade, sendo essa influência mais pronunciada no módulo de elasticidade dinâmico; não foi possível obter uma relação entre o módulo de elasticidade estático e dinâmico dos concretos produzidos com agregados graúdos reciclados; o módulo de elasticidade estático dos concretos produzidos com agregados graúdos reciclados é mais fortemente relacionado à resistência e à compressão; o módulo de elasticidade dinâmico possui maior relação com a porosidade dos concretos produzidos com agregados graúdos reciclados; os módulos de elasticidade estimados por equações algébricas apresentam elevada variabilidade.<br>Modulus of elasticity is a parameter that measures the stiffness of the concrete, being one of the properties taken into account in the structural safety check, since it expresses the conditions of the ultimate and service boundary state. When the influence of the replacement of natural aggregates by recycled aggregates is evaluated, the elastic behavior of the concrete becomes essential, since it cannot be compared to the behavior of compressive strength, usually lower than the concrete produced with natural aggregates. The use of compressive strength as a single parameter to estimate the modulus of elasticity of concrete produced with recycled aggregates has been increasingly questionated. Considering the influence of the use of recycled aggregate on the modulus of elasticity of concrete, only a few studies have compared the values of static elastic modulus and dynamic modulus. This research aims to evaluate the relationship between the static elastic modulus and the dynamic elastic modulus of concrete produced with recycled aggregates in replacement of natural aggregates, in order to correlate the type of aggregate to the modulus of elasticity, verifying the relationship between the two procedure of determination of elasticity modulus. Aggregates made of recycled concrete and of ceramic bricks were used in a replacement rate of 30% to the natural aggregate. The concretes were produced in three experimental proportions (lower w/c ratio, intermediate w/c ratio and higher w/c ratio). The properties evaluated at 28 days are: bulk concrete mass; porosity; compressive strength; static and dynamic modulus of elasticity. The main conclusions are: the recycled aggregate decrease the modulus of elasticity, mainly the dynamic modulus; there are no relationship between the static and dynamic modulus of elasticity of concrete produced with recycled aggregates; the static modulus of concrete produced with recycled aggregates has a higher relationship to the compressive strength; the dynamic modulus of elasticity is higher related to the porosity of concrete produced with recycled aggregates; the moduli of elasticity estimated by algebraic equations present high variability.
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Books on the topic "Dynamic modulus of elasticity"

1

Lee, Hosin David. Validation of the mix design process for cold in-place rehabilitation using foamed asphalt. Public Policy Center, University of Iowa, 2007.

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Chrzanowska, Elżbieta. Ocena dynamicznych modułów sprężystości skał na podstawie pomiarów wybranych własności fizycznych utworów fliszu podhalańskiego: Dynamic moduli evaluation based on measurements of selected physical properties of Podhale flysh [i.e. flysch] rocks. Wydawnictwo Polskiej Akademii Nauk, 1996.

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Wolfenden, A., ed. Dynamic Elastic Modulus Measurements in Materials. ASTM International, 1990. http://dx.doi.org/10.1520/stp1045-eb.

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1940-, Wolfenden Alan, ASTM Committee E-28 on Mechanical Properties., ASTM Committee E-28 on Mechanical Properties. Task Group E28.03.05 on Dynamic Modulus Measurements., and Symposium on Dynamic Modulus Measurements (1988 : Kansas City, Mo.), eds. Dynamic elastic modulus measurements in materials. ASTM, 1990.

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Shaker, Atif F. The effective modulus of elasticity of concrete in tension. Dept. of Civil Engineering, University of Alberta, Canada, 1991.

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John, Youngquist, and United States Forest Service, eds. Density, modulus of elasticity, creep, and durability of hardboard: A bibliography. U.S. Dept. of Agriculture, Forest Service, 1994.

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John, Youngquist, and United States Forest Service, eds. Density, modulus of elasticity, creep, and durability of hardboard: A bibliography. U.S. Dept. of Agriculture, Forest Service, 1994.

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John, Youngquist, and United States Forest Service, eds. Density, modulus of elasticity, creep, and durability of hardboard: A bibliography. U.S. Dept. of Agriculture, Forest Service, 1994.

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Craster, Richard V., and Julius Kaplunov, eds. Dynamic Localization Phenomena in Elasticity, Acoustics and Electromagnetism. Springer Vienna, 2013. http://dx.doi.org/10.1007/978-3-7091-1619-7.

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Ray, Lundy James, Oregon. Dept. of Transportation. Research Unit., and United States. Federal Highway Administration., eds. Asphalt mix characterization using dynamic modulus and APA testing: Final report. Oregon Dept. of Transportation, Research Unit, 2005.

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Book chapters on the topic "Dynamic modulus of elasticity"

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Zezulová, Eva. "The Dynamic Modulus of Elasticity as an Important Parameter for Military Use of Constructions." In Durability of Critical Infrastructure, Monitoring and Testing. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-3247-9_22.

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Özerkan, N. G., and İ. Ö. Yaman. "Use of Dynamic Modulus of Elasticity to Assess the Durability of Self Consolidating Concrete." In Nondestructive Testing of Materials and Structures. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_43.

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Lüttschwager, Nils Olaf Bernd. "Modulus of Elasticity." In Raman Spectroscopy of Conformational Rearrangements at Low Temperatures. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08566-1_6.

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Keaton, Jeffrey R. "Modulus of Elasticity." In Selective Neck Dissection for Oral Cancer. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_205-1.

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Gooch, Jan W. "Modulus of Elasticity." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7589.

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Keaton, Jeffrey R. "Modulus of Elasticity." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_205.

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Flohr, Alexander, Catharina Rohde, Savitha Devarajamohalla Narayana, and Andrea Osburg. "Evaluation of Strength and Modulus of Elasticity of Polymer-Modified Cement Concrete (PCC) Under Thermal Impact Within a Defined Service Temperature Range." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_52.

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AbstractPolymer-modified cement mortars (PCM) and concretes (PCC) are mainly used in concrete repair and restoration exhibiting improved durability, suitable chemical resistance, and beneficial adhesion strength compared to unmodified cementitious materials. Due to these favorable properties, the material is increasingly implemented in construction. Commonly, the modifiers applied to cementitious binders consist of thermoplastic polymers, which feature a change in the deformation behavior under the influence of different temperatures. Despite the distinct temperature-dependent properties of the polymers, the load-dependent deformation behavior of PCM and PCC was barely investigated within a service temperature range. To make statements about the effect of polymers on the load bearing and elastic deformation behavior of PCM and PCC, the engineering properties of the material have to be experimentally assessed under thermal conditioning. Accordingly, the compressive and flexural strength as well as dynamic and static modulus of elasticity of seven different PCM mixtures were characterized while the specimens were exposed to service temperatures of −20 ℃, 20 ℃, and 60 ℃. After the specimens were thermally conditioned in a climate chamber, the samples were transferred to the equally conditioned test machine and tested in the proposed temperature scope. The experimental results reveal influential changes in all tested mechanical attributes for the modified system within the applied service temperature range compared to an unmodified reference. This knowledge is essential to further investigate the temperature impact on the material and develop appropriate prediction models for the application of polymer-modified cementitious materials in construction and the integration in design guidelines.
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Akbarov, S. D., and A. N. Guz. "Normalized Modulus of Elasticity." In Mechanics of Curved Composites. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-9504-4_10.

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Collings, E. W. "Dynamic Elastic Modulus." In Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2095-1_4.

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Parker, Kevin J. "Dynamic Elasticity Imaging." In Ultrasound Elastography for Biomedical Applications and Medicine. John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119021520.ch15.

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Conference papers on the topic "Dynamic modulus of elasticity"

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Kashcheev, I. D., K. G. Zemlyanoi, and A. R. Khafizova. "The determination of dynamic modulus of refractory elasticity." In PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON INDUSTRIAL MANUFACTURING AND METALLURGY (ICIMM 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0074722.

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Valenzuela, M. Anibal, John M. Bentley, and Robert D. Lorenz. "Dynamic on-line sensing of sheet modulus of elasticity." In 2008 54th IEEE Pulp and Paper Industry Technical Conference - PPIC. IEEE, 2008. http://dx.doi.org/10.1109/papcon.2008.4585810.

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Sabev, Sabi, and Plamen Kasabov. "Determination of the dynamic modulus of elasticity Ed of AlSi18Cu3CrMn alloy." In 10th International Scientific Conference “TechSys 2021” – Engineering, Technologies and Systems. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0091007.

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Mizar, Shivananda P., and Ryszard J. Pryputniewicz. "Dynamic Characterization of Shape Memory Alloys for Integration With Electronic Packaging." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/epp-24727.

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Abstract Integration of Shape Memory Alloys (SMAs) with electronic packaging depends on detailed knowledge of thermomechanical behavior of SMAs. In this paper, thermomechanical behavior of SMAs is studied using a new approach based on Analytical, Computational, and Experimental Solutions (ACES) methodology. More specifically, variation in modulus of elasticity of equiatomic NiTi alloy is studied, as a function of temperature. The results show that the modulus of elasticity of the NiTi alloy studied herein varies from 38 GPa to 72 GPa as the temperature changes from −15°C to 190°C, corresponding to phase transition from martensite to austenite. Comparison of analytical, computational, and experimental results shows good correlation.
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Cristina Dos Santos Ferreira, Gisleiva, and WÉlida De Sousa Sarro. "Correlation between dynamic and static modulus of elasticity in mini panels of soil-cement." In XXIII Congresso de Iniciação Científica da Unicamp. Galoá, 2015. http://dx.doi.org/10.19146/pibic-2015-38195.

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Danciu, Ciprian. "COMPARATIVE�ANALYSIS�OF�THE�MOISTURE�AND�POROSITY�INFLUENCE�ON�THE�STATIC�AND�DYNAMIC�ELASTICITY�MODULUS�." In SGEM2012 12th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2012. http://dx.doi.org/10.5593/sgem2012/s02.v2005.

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Šimunović, Mirjana, Pavica Senić Barišić, and Sanja Dimter. "Elastic moduli of stabilized mixtures with wood ash." In 8th International Conference on Road and Rail Infrastructure. University of Zagreb Faculty of Civil Engineering, 2024. http://dx.doi.org/10.5592/co/cetra.2024.1681.

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Stabilized base courses are an indispensable part of today's pavement structures. Stabilized mixtures as we know them consist of high-quality crushed aggregate bound with a hydraulic binder, usually cement. Due to their composition, stabilizing mixtures increase the strength and stiffness of the pavement structure, which is expressed by modulus of elasticity, i.e., the measure of the stiffness of the pavement structure due to dynamic loading. Although classic stabilized mixtures meet the criteria of load capacity, stiffness and durability, the modern approach in road construction is changing. Namely, in order to meet requirements of sustainable development, it is necessary to use alternative, waste materials. Wood ash, a by-product of the combustion of wood biomass in the production of electricity and thermal energy, has been shown through various studies to be a potentially valuable and non-standard material that can be used in road construction. Wood ash can improve the properties of stabilizing mixtures (as strengths or modulus of elasticity) and can contribute to reducing the amount of cement required in the stabilized mixture. This paper describes the determination of the elasticity modulus on stabilized mixtures containing sand, cement and wood ash by a non-destructive ultrasonic method. The mixture of sand and ash was stabilized with different amounts of cement. The aim of the work was to determine the dependence of the modulus of elasticity value on the stabilized mixture composition. This study also established a correlation between the modulus of elasticity and the ultrasound velocity. These test results show the improvement of stabilized mixtures properties as well as the importance of ultrasonic method in assessing properties and quality of stabilized mixtures.
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Mutswatiwa, Lovejoy, Celestin Nkundineza, and Mehmet A. Güler. "Modelling the Effect of Track Stiffness Variation on Wheel Rail Interaction Using Finite Element Method." In 2021 Joint Rail Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/jrc2021-58519.

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Abstract For predictive maintenance purpose, wheel and rail wear evolution models have been developed based on wheel rail contact force calculations. These models are known to assume the wheel rotating on a rigid rail. However recent developments have shown that the flexibility of the track plays an important role in wear evolution. On the other hand, vertical track stiffness variation along the track is known to exist and to affect the track flexibility. The present research work investigates the influence of non-uniform track modulus on the wheel rail contact forces using elasto-plastic explicit dynamic Finite Elements (FE). The FE model is composed of a quarter car model running on a rail supported by three cross-ties. The modulus of elasticity of the cross-ties is calibrated to produce the total track modulus of the railroad track infrastructure. Non-uniformity of the track is modeled by assigning distinct elasticity moduli to the cross-ties. The instantaneous contact physical parameters are extracted from FE models repetitively for various cross-tie modulus ratios. The results show that increase in cross-tie modulus variation results in increased fluctuation amplitudes of wheel-rail contact parameters such as force, stress and contact area. This effect leads to changes of the rate of material removal on the wheels and rails. This research work intends to incorporate the spatial variation of the railroad track stiffness into rail vehicle wheel and track wear prediction models.
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GIACCU, GIAN FELICE, DANIEL MELONI, MONICA VALDÈS, and MASSIMO FRAGIACOMO. "DYNAMIC DETERMINATION OF THE MODULUS OF ELASTICITY OF MARITIME PINE CROSS-LAMINATED PANELS USING VIBRATION METHODS." In SUSTAINABLE DEVELOPMENT AND PLANNING 2017. WIT Press, 2017. http://dx.doi.org/10.2495/sdp170501.

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Ereiz, Suzana, Ivan Duvnjak, Janko Košćak, Marko Bartolac, Domagoj Damjanović, and Marina Frančić-Smrkić. "INTEGRATION OF THE OMA AND FEMU FOR ESTIMATION MODULUS OF ELASTICITY IN MASONRY STRUCTURES." In 3rd Croatian Conference on Earthquake Engineering. University of Zagreb Faculty of Civil Engineering, 2025. https://doi.org/10.5592/co/3crocee.2025.44.

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The recent seismic activity in Croatia has inflicted significant damage on numerous buildings, with masonry structures being especially vulnerable. For the effective rehabilitation and restoration of these structures, it is critical to assess key mechanical properties such as the modulus of elasticity, compressive strength, tensile strength, and shear strength. Conventional methods for determining these properties often involve labour-intensive field tests and laboratory analysis of masonry samples. This paper introduces an innovative methodology that integrates Operational Modal Analysis (OMA) with Finite Element Model Updating (FEMU) to estimate the modulus of elasticity in masonry structures. By leveraging dynamic parameters, including natural frequencies and mode shapes derived from OMA, the methodology allows for the updating of a numerical sub-model of the masonry. This integrated approach was applied to a real structure, with results compared to those obtained using traditional testing methods. The findings indicate that the proposed method is not only more efficient but also yields highly accurate estimations of mechanical properties, particularly the modulus of elasticity, with minimal disruption to the structure. The reduced need for invasive testing, coupled with its precision, positions this approach as a compelling alternative to traditional methods for assessing the structural integrity of masonry buildings following seismic events.
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Reports on the topic "Dynamic modulus of elasticity"

1

Carter, Austin D., and S. Elhadj. Modulus of Elasticity and Thermal Expansion Coefficient of ITO Film. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1325877.

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Correa, Laurice Mara Spinelli, Frederica Jose Nistal Franca, Rubin Shmulsky, R. Daniel Seale, Robert Ross, and Christopher Adam Senalik. Evaluation of Modulus of Elasticity and Modulus of Rupture of Cross-Laminated Timber with Longitudinal Vibration NDE Techniques. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2022. http://dx.doi.org/10.2737/fpl-rp-714.

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Verrill, Steve P., Frank C. Owens, David E. Kretschmann, and Rubin Shmulsky. Statistical models for the distribution of modulus of elasticity and modulus of rupture in lumber with implications for reliability calculations. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2017. http://dx.doi.org/10.2737/fpl-rp-692.

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Turk, Chris, John F. Hunt, and David J. Marr. Cantilever-beam dynamic modulus for wood composite products. Part 1, apparatus. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2008. http://dx.doi.org/10.2737/fpl-rn-308.

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Burchell, Timothy. AGC-1 irradiation induced property changes analysis report: Dynamic Elastic Modulus. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1999109.

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Shives, T. Robert, and Richard J. Fields. Modulus of elasticity and Poisson's ratio for types 17-4 PH and 410 stainless steels in compression. National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4671.

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Chang, Y. W., and R. W. Seidensticker. Dynamic characteristics of Bridgestone low shear modulus-high damping seismic isolation bearings. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10181217.

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Burakovsky, Leonid, Daniel Blaschke, and Dean Preston. IC W20_thermoelasticity Highlight: Dynamic strength - shear modulus scaling for tantalum at extreme pressures. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1766974.

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Kretschmann, David, James Evans, Mike Wiemann, Bruce A. Kimball, and Sherwood B. Idso. Long-term effects of elevated carbon dioxide concentration on sour orange wood specific gravity, modulus of elasticity, and microfibril angle. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2007. http://dx.doi.org/10.2737/fpl-rn-307.

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Schmidt, Daniel. COLLABORATIVE RESEARCH AND DEVELOPMENT (CR&D) Delivery Order 0065: Nanostructured Dynamic Modulus Materials. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada530596.

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