Relevant bibliographies by topics / Angel of internal friction

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Angel of internal friction'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Angel of internal friction.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Angel of internal friction"

1

Masoud, Talal. "Shear strength characteristics of Jerash expansive soil." Journal of Advanced Sciences and Engineering Technologies 3, no. 2 (2021): 74–80. http://dx.doi.org/10.32441/jaset.03.02.08.

Full text
Abstract:
The results of the direct shear test on Jerash expansive soil show the effect of the initial water content on the cohesion (c) and on the angel of internal friction ( ) [shear strength parameters].it show that, as the initial water increase, the cohesion (c) of Jerash expansive soil also increase up to the shrinkage limit, after that increase of water even small amount, decrease the cohesion of the soil. On the other hand, the results of direct shear test show also that as the water content increase, the angle of internal friction ( )remain unchanged up to shrinkage limit , any increase of water cause a large decrease on the angle of internal friction of Jerash expansive soil.
APA, Harvard, Vancouver, ISO, and other styles
2

Zegzulka, Jiri, Daniel Gelnar, Lucie Jezerska, Alvaro Ramirez-Gomez, Jan Necas, and Jiri Rozbroj. "Internal Friction Angle of Metal Powders." Metals 8, no. 4 (2018): 255. http://dx.doi.org/10.3390/met8040255.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Mo, You, Xu Chuan Liu, Zi Hong Guo, Bin Teng, Zu Yin Zou, and Zhan Yuan Zhu. "Slip-Line Field Theory's Application in Soil Subgrade." Applied Mechanics and Materials 170-173 (May 2012): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.283.

Full text
Abstract:
Acquiring soil’s critical load is very important when designing soil foundation and soil subgrade with overloading method. Mohr-Coulomb strength theory is combined with slip-line field theory, then a theoretic method which is practicable to analyze critical load of soil come out. Analyzed theoretically and compared with others, the theoretic method is applied to describe the relationship between internal friction angel, internal cohesion, δ, lateral pressure and critical load, which express that this theoretic method is rational. Numerical analysis is adopted which make it clear that soil subgrade’s yield zone is small when it is under the critical pressure, which approve that this theory is very close to lower limit of soil’s critical load. The theoretical method can provide useful information to engineering designers and researchers.
APA, Harvard, Vancouver, ISO, and other styles
4

Zhang, Lian Wei. "Influence of Anisotropic Internal Friction Angle on the Stability of Uniform Soil Slopes." Applied Mechanics and Materials 170-173 (May 2012): 270–73. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.270.

Full text
Abstract:
The effect of anisotropy of friction angle in natural deposited soil on the stability of soil slopes was studied in this paper. Stability analysis was performed on a uniform soil slope with anisotropic friction angle. Spencer’s method was used, and the variation of friction angle was assumed to be linear to the change of direction of the slip surface. It was shown that 7-10 percent of change in safety factor might achieve within a 10m-highed anisotropic soil slope. It was also found from the analysis that that frictional anisotropy had no obvious effect on the location of critical slip surface.
APA, Harvard, Vancouver, ISO, and other styles
5

Md., Monir. Hossain, Sultana Nasima, and Chandro Malo Ripon. "Correlations between CPT, SPT and Soil Parameters for Khulna, Bangladesh." Journal of Geotechnical Studies (e-ISSN: 2581-9763) 5, no. 1 (2020): 27–32. https://doi.org/10.5281/zenodo.3741371.

Full text
Abstract:
Soil is naturally heterogeneous and non-uniform materials because it is made up of different types of matter. Understanding of soil parameters is one of the most complex tasks in geotechnical engineering. Several laboratory tests of soil have to carry out for engineering practices. Laboratory tests take too much time to accomplish and extravagant also. There is another alternative way to get soil parameters direct from soil field investigation report to save time and cost. The main objective of this study is to investigate the relationships of soil parameters with most commonly used soil investigating tools SPT and CPT. In this research, three pairs of CPT and SPT tests were performed at the riverbank of the Rupsha River, Khulna, Bangladesh. Different correlations have been developed in this paper among various field tests and laboratory tests. Analysis demonstrate that qtc/N1-60 ratio as a function of constant are better applicable to the local soils instead of D50 or fc based correlations. Finally, Internal angel of friction (ϕ) has been carried out using the correlation of SPT, CPT and compare with internal friction angle (ϕ) from Direct Shear (DS), and Multi-Stage Triaxial tests (MSTT) have been performed.
APA, Harvard, Vancouver, ISO, and other styles
6

Petersen, DR, RE Link, NS Pandian, A. Sridharan, and S. Srinivas. "Angle of Internal Friction for Pond Ashes." Journal of Testing and Evaluation 28, no. 6 (2000): 443. http://dx.doi.org/10.1520/jte12135j.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

WÓJCIK, Artur, and Jarosław FRĄCZEK. "THE INFLUENCE OF THE REPOSE ANGLE AND POROSITY OF GRANULAR PLANT MATERIALS ON THE ANGLE OF INTERNAL FRICTION AND COHESION." Tribologia, no. 5 (October 31, 2017): 117–23. http://dx.doi.org/10.5604/01.3001.0010.5931.

Full text
Abstract:
Internal friction in granular plant materials is a very complex phenomenon. This is due to a vast number of factors that determine the behaviour of these materials. This article looks at exploring the impact of porosity, the repose angle, and moisture on the value of the internal friction angle and cohesion. Statistical analysis showed that the influence of the examined factors on the parameters of friction is statistically significant. Nonlinear estimation was performed, which allowed developing functions describing the mentioned relationship, for which the goodness-of-fit (depending on the material type) ranged from 0.813 to 0.915 for the internal friction angle and from 0.748 to 0.963 in the case of cohesion. It has been found that internal friction and cohesion need further research that will take into account additional factors defining the examined material in a more accurate manner.
APA, Harvard, Vancouver, ISO, and other styles
8

Daldrop, Jan O., Julian Kappler, Florian N. Brünig, and Roland R. Netz. "Butane dihedral angle dynamics in water is dominated by internal friction." Proceedings of the National Academy of Sciences 115, no. 20 (2018): 5169–74. http://dx.doi.org/10.1073/pnas.1722327115.

Full text
Abstract:
The dihedral dynamics of butane in water is known to be rather insensitive to the water viscosity; possible explanations for this involve inertial effects or Kramers’ turnover, the finite memory time of friction, and the presence of so-called internal friction. To disentangle these factors, we introduce a method to directly extract the friction memory function from unconstrained simulations in the presence of an arbitrary free-energy landscape. By analysis of the dihedral friction in butane for varying water viscosity, we demonstrate the existence of an internal friction contribution that does not scale linearly with water viscosity. At normal water viscosity, the internal friction turns out to be eight times larger than the solvent friction and thus completely dominates the effective friction. By comparison with simulations of a constrained butane molecule that has the dihedral as the only degree of freedom, we show that internal friction comes from the six additional degrees of freedom in unconstrained butane that are orthogonal to the dihedral angle reaction coordinate. While the insensitivity of butane’s dihedral dynamics to water viscosity is solely due to the presence of internal friction, inertial effects nevertheless crucially influence the resultant transition rates. In contrast, non-Markovian effects due to the finite memory time are present but do not significantly influence the dihedral barrier-crossing rate of butane. These results not only settle the character of dihedral dynamics in small solvated molecular systems such as butane, they also have important implications for the folding of polymers and proteins.
APA, Harvard, Vancouver, ISO, and other styles
9

Jiang, Ping, and Meng Su Zhang. "Real-Time Monitor Method of Soil Slope Stability in Seasonal Frozen Area." Applied Mechanics and Materials 303-306 (February 2013): 777–81. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.777.

Full text
Abstract:
Soil slope in seasonal frozen area subject to rainfall or freezing and thawing cycles, the shear strength of soil damage and lead to landslide hazard. In order to predict the landslide hazard through monitoring the soil slope stability real-time, the soil slope stability evaluation system is established. The Neural Network Algorithm can simulate elastic-plastic finite element method well, and using Genetic Algorithm to search cohesion(c) and internal friction angel(φ) which meet the accuracy requirements. And the intelligent parameter inversion model of soil shear strength (c, φ) based on displacement is established. So, the slope stability can be evaluated real –time based on displacement monitor. Application of this method in actual project shows that this method is accurate and effective.
APA, Harvard, Vancouver, ISO, and other styles
10

Nasima, Sultana, S. M. Fahad Hossain A, Bhowmic Shotodru, Shahidul Hoque Md, and Akter Shantana Farjana. "A Study on the Friction Angel of Cox's Bazaar Sea Sand by Adding Recycled Plastic Chips." Journal of Advances in Geotechnical Engineering 2, no. 2 (2019): 1–5. https://doi.org/10.5281/zenodo.3377197.

Full text
Abstract:
Sea sand is that type of soil which is abundantly available, does not contain any organic content; the gradation of this soil is naturally good and can be mined at a low cost. The strength of this soil can be improved by using various methods. This study is mainly focused on the strength behavior of sea sand by adding recycled plastic chips of various percentages. The main reason for using plastic chips is that plastic materials should be used in a constructive way. As the usage of plastic materials is increasing day by day, it has become a great threat to our society and environment. In this study, used plastic bottles are altered into plastic chips and then these are mixed up with sea sand which was collected from Cox’s Bazar and plastic chips of 5, 10 and 15 percent were mixed. Direct shear test has been conducted to check the friction angel the sea sand. According to the results it is seen that the angle of internal friction of sea sand does not improve much by adding different percentages of plastic chips with the mother soil.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Angel of internal friction"

1

Omam, Alan Frederic. "Internal friction." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

Find full text
Abstract:
The phenomenon of internal friction most generally defined as the dissipation of mechanical energy inside a gaseous, liquid or solid medium. It is basically different from “friction” in the tribological sense, i.e., the resistance against the motion of two solid surfaces relative to each other (“external friction”).
APA, Harvard, Vancouver, ISO, and other styles
2

COSTA, Daniel Beserra. "Análise da deformação permanente de misturas asfálticas a partir dos critérios de Mohr Coulomb." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1538.

Full text
Abstract:
Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-08-23T13:35:50Z No. of bitstreams: 1 DANIEL BESERRA COSTA - DISSERTAÇÃO (PPGECA) 2018.pdf: 3178699 bytes, checksum: cdb4fe8ec72383894c5c447ebe2853ae (MD5)<br>Made available in DSpace on 2018-08-23T13:35:50Z (GMT). No. of bitstreams: 1 DANIEL BESERRA COSTA - DISSERTAÇÃO (PPGECA) 2018.pdf: 3178699 bytes, checksum: cdb4fe8ec72383894c5c447ebe2853ae (MD5) Previous issue date: 2018-02-21<br>Capes<br>A deformação permanente é definida como o acúmulo de pequenas quantidades de deformação não recuperáveis resultante da aplicação das cargas dos veículos. A deformação permanente na camada de revestimento asfáltico pode ser oriunda por três mecanismos: deformação permanente por densificação, por uso e por fluência da mistura. Dado que as temperaturas de serviço da camada de revestimento estão em torno de 40 a 60 °C, a mistura asfáltica nesse intervalo de temperatura se comporta como um material sólido. Sendo assim, é razoável supor que os mecanismos de falha aplicáveis aos materiais sólidos sejam válidos para as misturas de asfálticas. Sendo o critério Mohr-Coulomb amplamente utilizado para descrever as características de cisalhamento de materiais sólidos, poderá ser utilizado para obtenção do ângulo de atrito interno da mistura, bem como o seu intercepto coesivo. Este trabalho teve como objetivo a determinação de ângulos de atrito internos de diferentes misturas asfálticas e sua influência no comportamento mecânico, em especifico, na resistência à deformação permanente destas misturas. Como forma de atingir o objetivo da pesquisa foi desenvolvido um programa experimental visando à avaliação das propriedades mecânicas relacionadas ao ângulo de atrito interno das misturas asfálticas com CAP 50/70 e E – 55/75. Foi possível executar análises em laboratório a partir da determinação de parâmetros de ruptura por cisalhamento, com o auxílio da teoria de Mohr-Coulomb, tendo como inferência o desempenho de misturas estudadas em campo. Verificou-se que, a cada acréscimo de 5% de partículas graúdas em uma faixa granulométrica, as misturas estudadas apresentaram, em geral, um ganho de 1° (Grau) no ângulo de atrito interno para cada faixa estudada. Entretanto, deve ser observado o limite de 30 a 35% de partículas graúdas para cada mistura. Pode-se concluir que: os parâmetros de ruptura por cisalhamento, ângulo de atrito interno e intercepto coesivo são fatores determinantes no desempenho a deformação permanente de misturas asfálticas. Para os ligantes utilizados os resultados indicaram que o acréscimo do ângulo de atrito interno resulta numa maior resistência a deformação permanente.<br>Permanent deformation is defined as the accumulation of small amounts of non-recoverable deformation resulting from the application of vehicle loads. The permanent deformation in the surface layer of asphalt pavements can come from three mechanisms: permanent deformation by densification, by use and by creep of the mixture. Since the service temperatures of the pavement surface layer are around 40 and 60 ºC, the asphalt mixture, in this temperature range, behaves as a solid material. Therefore, it is reasonable to assume that failure mechanisms applicable to solid materials are valid for asphalt mixtures. As the Mohr-Coulomb criterion is widely used to describe the shear characteristics of solid materials, it can be used to obtain the internal friction angle of the asphalt mixture as well as to estimate its cohesive intercept. This work had as objective to determine the internal angles of friction of different asphalt mixtures and their influence on the mechanical behavior, in particular, on the resistance to permanent deformation of these mixtures. In order to achieve the objective of this research, an experimental program was developed to evaluate the mechanical properties related to the internal angle of friction of asphalt mixtures with the 50/70 asphalt binder and the E 55/75 asphalt binder. It was possible to perform laboratory analyses from the determination of shear rupture parameters, supported by the Mohr-Coulomb's theory, inferred by the performance of mixtures studied in the field. It was verified that, at each increment of 5% of coarse particles in a particle size range, the studied mixtures presented, in general, a gain of 1° (degree) in the internal angle of friction for each size range studied. However, the limit of 30 to 35% of coarse particles should be observed for each mixture. It can be concluded that: the parameters of shear rupture, internal angle of friction and cohesive intercept are determining factors in the permanent deformation performance of asphalt mixtures. For the asphalt binders used, the results indicated that the increment of the internal angle of friction results in a greater resistance to permanent deformation.
APA, Harvard, Vancouver, ISO, and other styles
3

Yang, Lisheng. "Friction modelling for internal combustion engines." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343482.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Otto, Oliver, Sebastian Sturm, Nadanai Laohakunakorn, Ulrich Keyser, and Klaus Kroy. "Rapid internal contraction boosts DNA friction." Diffusion fundamentals 20 (2013) 77, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13665.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Otto, Oliver, Sebastian Sturm, Nadanai Laohakunakorn, Ulrich Keyser, and Klaus Kroy. "Rapid internal contraction boosts DNA friction." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183656.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Brutzer, Hergen, Alexander Huhle, Daniel Klaue, and Ralf Seidel. "Internal friction of a migrating Holliday junction." Diffusion fundamentals 20 (2013) 72, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13659.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Brutzer, Hergen, Alexander Huhle, Daniel Klaue, and Ralf Seidel. "Internal friction of a migrating Holliday junction." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183596.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Srinivasan, Anand. "The influence of internal friction on rotordynamic instability." Thesis, [College Station, Tex. : Texas A & M University, 2004. http://hdl.handle.net/1969.1/263.

Full text
Abstract:
Thesis (M.S.)--Texas A & M University, 2003.<br>"Major Subject: Mechanical Engineering." Title from author supplied metadata (automated record created on Jul. 18, 2005.). Vita. Abstract. Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
9

Liu, Zhong-ming. "Characterization of superconducting properties using internal friction measurement." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17591077.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Jonák, Martin. "Optimalizace konstrukce korečkových dopravníků." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-364617.

Full text
Abstract:
This thesis deals with a study of methods sufficient to describe the behavior of bulk materials (homogeneous and non-homogeneous) during their transport by bucket elevators in the application focused on the optimization of the bucket shape and also on the optimization of operating parameters of whole elevator. More specifically, this thesis is based on the studying and creating analytical and numerical computational models which are used for description of flows and deformations especially of particulate materials. Firstly, the thesis is focused on the process of discharging the bucket – the relationship among the shape of the surface of a particulate material and geometry, position and movement of the bucket. The beginning and way of discharge of the bucket will be determined. Secondly, the thesis includes the overall computational model of a bucket elevator which is based on discrete element method and presented in the case study. The goal is to determine the limits of some classical physical and mathematical descriptions.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Angel of internal friction"

1

J, Walton, and United States. National Aeronautics and Space Administration., eds. Internal rotor friction instability. National Aeronautics and Space Administration, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Blanter, Mikhail S., Igor S. Golovin, Hartmut Neuhäuser, and Hans-Rainer Sinning. Internal Friction in Metallic Materials. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68758-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

TSeitlin, A. I. Role of internal friction in dynamic analysis of structures. Balkema, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

H, Barr D. I., and HR Wallingford (Firm), eds. Tables for the calculation of friction in internal flows. T. Telford, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

T︠S︡eĭtlin, A. I. Role of internal friction in dynamic analysis of structures. A.A. Balkema, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

S, Blanter M., and Piguzov I͡U︡ V, eds. Metod vnutrennego trenii͡a︡ v metallovedcheskikh issledovanii͡a︡kh: Spravochnik. "Metallurgii͡a︡", 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

J, Tattar Marc, and Lewis Research Center, eds. Analytical skin friction and heat transfer formula for compressible internal flows. Lewis Research Center, National Aeronautics and Space Administration, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

J, Tattar Marc, and Lewis Research Center, eds. Analytical skin friction and heat transfer formula for compressible internal flows. Lewis Research Center, National Aeronautics and Space Administration, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Institution of Mechanical Engineers (Great Britain). Combustion Engines Group., Chung-kuo chi hsieh kung chʻeng hsüeh hui (Peking, China), and International Conference on "Combustion Engines : Reduction of Friction and Wear (2nd : 1989 : London, England), eds. Combustion engines: Reduction of friction and wear : second international conference, 19-20 September 1989, Birdcage Walk, London. Published for the Institution by Mechanical Engineering Publications, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

International Conference on Internal Friction and Ultrasonic Attenuation in Solids (8th 1985 University of Illinois). Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids: June 3-6, 1985, University of Illinois Urbana (USA). Editions de physique, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Angel of internal friction"

1

Keaton, Jeffrey R. "Angle of Internal Friction." In Selective Neck Dissection for Oral Cancer. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_16-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Keaton, Jeffrey R. "Angle of Internal Friction." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Sun, Zongjun, Yingfeng Han, Fei Liu, and Rui Min. "Sensitivity Analysis of Influencing Factors of Vertical Bearing Capacity of Rock-Socketed Piles Based on Orthogonal Test." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4090-1_9.

Full text
Abstract:
AbstractIn order to investigate the sensitivity of influencing factors of rock-socketed piles’ vertical bearing capability. The field static load test of embedded rock piles was performed in the article, and the pile-soil interaction model was built using ABAQUS software. The orthogonal test is properly designed to examine the sensitivity of the influencing elements of embedded rock piles by varying the relevant pile, pile side soil and bedrock parameters. The conclusions are as follows: (A) From large to small, the following factors have varying degrees of influence on the bearing capacity of rock-socketed piles: rock internal friction angle, pile diameter, rock elastic modulus, pile elastic modulus, rock poisson's ratio, soil density, soil thickness, rock-socketed depth, rock friction coefficient, rock cohesion, pile density, soil poisson's ratio, soil friction coefficient, soil elastic modulus, rock density, soil cohesion, pile poisson's ratio and soil internal friction angle; (B) Rock internal friction angle, pile diameter, rock elastic modulus, pile elastic modulus, rock poisson's ratio, soil density, soil thickness, and depth of the rock-socketed piles all have a greatly significant impact on the vertical bearing capacity of these piles. The bearing capacity of rock-socketed piles is significantly impacted by the rock friction coefficient and rock cohesiveness. The research results can provide a basis for the design of rock-socketed piles and the prediction of bearing capacity of rock-socketed piles.
APA, Harvard, Vancouver, ISO, and other styles
4

Lv, Dongbin, Honggang Zhang, Lihao Zeng, and Jiechao Lei. "Study on High Temperature Performance of Asphalt Mixture and Correlation of Its Evaluation Indexes." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2532-2_4.

Full text
Abstract:
AbstractIn order to better evaluate the high-temperature performance of asphalt mixture, based on the conventional rutting test and Hamburg rutting test, this paper further studies the influence of temperature, grading and asphalt type on the high-temperature shear resistance of asphalt mixture by using uniaxial penetration test and uniaxial compression test. Based on Mohr Coulomb theory, the cohesive force and internal friction angle of mixture were calculated. Based on the analysis of variance, the significance of the influence of temperature and gradation on the high-temperature shear characteristics was studied. Linear regression analysis was used to reveal the correlation between the fractal dimension treated gradation and the shear resistance characteristics. Finally, the correlation between the high-temperature shear resistance performance index and the high-temperature rutting resistance evaluation index was analyzed. The results show that temperature has a significant effect on cohesion and internal friction angle of gradation pairs, and the fractal dimension Dc of coarse aggregate is positively correlated with cohesion and internal friction angle, with the strongest correlation. It indicates that the high-temperature performance of the mixture can be improved by increasing the passing rate of the sieve hole above 4.75 mm in the grading design. The correlation R2 between cohesive force index and high-temperature rutting resistance index of mixture at 35 ℃ is higher than 0.9, which belongs to extremely strong correlation. The shear resistance index of cohesion at 35 ℃ can be used to characterize the high-temperature rutting resistance of asphalt mixture.
APA, Harvard, Vancouver, ISO, and other styles
5

Zakarka, Mindaugas, and Šarūnas Skuodis. "Granular Soil Relationship Between Angle of Internal Friction and Uniformity Coefficient." In Lecture Notes in Civil Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20172-1_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Dalai, Subhashree, and Chittaranjan Patra. "Prediction of Angle of Internal Friction Based on SPT N Values." In Lecture Notes in Civil Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6466-0_43.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Zhong, Zicheng. "Development of Pre Drilling In-Situ Rock Mass Shear Measurement System." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_20.

Full text
Abstract:
AbstractIn engineering construction, it is of great significance to calculate the shear strength and internal friction Angle of rock mass. Compared with laboratory test and theoretical analysis, in-situ test can maintain the essential state of rock mass to the maximum extent, and obtain multiple groups of test data conveniently and quickly. The pre drilling in situ rock mass shear measurement system is independently developed. The system is described from the aspects of shear principle, overall design, hardware design and software platform. The system can get the shear strength parameters of rock mass quickly and efficiently, and the linear correlation of test data is high.
APA, Harvard, Vancouver, ISO, and other styles
8

Li, Hongshuai, Lei Tan, and Huanxin Zhao. "Influence of Blade Geometry on Performance of Hydrogen Vortex Blower in Fuel Cell System." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_18.

Full text
Abstract:
AbstractHydrogen fuel cell has great potential in replacement of traditional fossil energy systems to decrease carbon dioxide emission. Vortex blower is a key device in the hydrogen recirculation system, which need to be studied deeply to improve the performance of the whole fuel cell. In this paper, the steady internal flow of a hydrogen vortex bower was numerical simulated, and the effect of blade number and blade flapping angle on the performance was studied. The simulation results were compared with experimental data, and the deviation of simulation in choking condition was observed. With the validated simulation method, the influence of blade number and flapping angle was studied. Higher blade number causes more friction, and less blade number leads to flow separation. The negative flapping angle also has the effect on depressing low-pressure region. This research illuminates the simulation method can be further applied to the aerodynamic study and structure optimization of vortex blower.
APA, Harvard, Vancouver, ISO, and other styles
9

Yin, Jianliang, Zhikui Liu, Zhanfei Gu, Yan Yan, Yong Xiong Xie, and Bingyan Huang. "Effect of Dry-Wet Cycling on Shear Strength of Phyllite-Weathered Soil in Longsheng, Guilin." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_42.

Full text
Abstract:
AbstractThe phyllite-weathered soil is a regional speciality. It is essential to study the changes in shear strength of phyllite-weathered soil under dry-wet cycles to understand the changes in mechanical properties of phyllite-weathered soil in the process of dry-wet climate and to manage the slope of phyllite-weathered soil. This paper simulated 12 dry-wet cycles on the specimens of remodelled phyllite-weathered soil. Direct shear and SEM tests were conducted on the specimens in the 0th, 3rd, 6th, 9th, and 12th drying paths. The effects of moisture content and the number of dry-wet cycles on the shear strength of phyllite-weathered soil were analysed macroscopically and microscopically. The following conclusions were obtained: (1) The cohesion of the weathered soil of phyllite will be reduced by increasing the number of cycles, and the more the number of dry-wet cycles, the more pronounced the reduction; the internal friction angle of the weathered soil of phyllite will be reduced by increasing the number of cycles, but the pattern of the decrease in the internal friction angle is not obvious. (2) The increase in the number of dry-wet cycles will increase the stiffness and brittleness of the phyllite-weathered soil specimen, and it will change from the weak hardening type of plastic damage to the solid softening type of brittle damage after a certain number of cycles. (3) The SEM test found that phyllite-weathered soil particles in Longsheng, Guilin are large, and most of the particles are in face-to-face and angle-to-face contact, which is easy to form a hollow structure, and the dry density value of the soil in the natural state is small. At the same time, the soil is reddish-brown in colour because of the leaching of Fe2 O3. The shear strength index of the cemented phyllite-weathered soil with Fe2 O3 is more significant than that of phyllite-weathered soil in other areas. The soil has a good shear strength index and a small dry density.
APA, Harvard, Vancouver, ISO, and other styles
10

Qingping, Kong, and Xu Kuangdi. "Internal Friction." In The ECPH Encyclopedia of Mining and Metallurgy. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-0740-1_921-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Angel of internal friction"

1

Khan, Hamad, Muhammad Jawad-ul-Haq, Abdullah Khan Jadoon, and Haq Nawaz Khan. "Optimizing Granular Soil Properties with Marble Dust: A Case Study from Peshawar City." In 14th International Civil Engineering Conference. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-ozq4uc.

Full text
Abstract:
A The marble processing industry in the Peshawar region generates a significant amount of waste during the cutting and processing stages, with approximately 20 to 25% of the total processed stone ending up as waste. This waste is often disposed of in open land, causing severe environmental problems. To address these issues, this study investigates the use of waste marble dust for soil stabilization as an economical and sustainable solution, particularly in regions where granular material for backfilling is scarce. Granular soil (sand) samples were mixed with varying percentages of waste marble dust (3.5%, 7%, 14%, 21%, and 28% by dry weight of soil). A series of geotechnical tests, including specific gravity, sieve analysis, modified Proctor compaction tests, and large direct shear tests, were conducted on both natural and marble dust-stabilized soils. The modified Proctor tests identified an optimum moisture content and maximum dry density at a 14% marble dust mixture. Subsequent large direct shear tests on this optimum mixture revealed enhanced shear strength parameters, including improved cohesion and angle of internal friction. The results demonstrated that incorporating marble dust into granular soil significantly improved its geotechnical properties. At the optimum 14% marble dust content, the soil exhibited increased compactness and enhanced shear strength, making it a viable alternative to traditional backfill materials. This study not only offers a cost-effective approach to soil stabilization but also provides a sustainable solution for managing marble waste, contributing to environmental preservation especially for Peshawar city and the development of local construction projects.
APA, Harvard, Vancouver, ISO, and other styles
2

Jocsak, Jeffrey, Yong Li, Tian Tian, and Victor W. Wong. "Analyzing the Effects of Three-Dimensional Cylinder Liner Surface Texture on Ring-Pack Performance With a Focus on Honing Groove Cross-Hatch Angle." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1333.

Full text
Abstract:
Frictional losses in the piston ring-pack of an engine account for approximately 20% of the total frictional losses within an engine. Although many non-conventional cylinder liner finishes are now being developed to reduce friction and oil consumption, the effects of the surface finish on ring-pack performance is not well understood. The current study focuses on modeling the effects of three-dimensional cylinder liner surface anisotropy on piston ring-pack performance. A rough surface flow simulation program was developed to generate flow factors and shear stress factors for three-dimensional cylinder liner surface textures. Rough surface contact between the ring and liner was modeled using a previously published methodology for asperity contact pressure estimation between actual rough surfaces. The surface specific flow factors, shear stress factors, and asperity contact model were used in conjunction with MIT’s previously developed ring-pack simulation program to predict the effects of different surface textures on ring-pack behavior. Specific attention was given to the effect of honing groove cross-hatch angle on piston ring-pack friction in a stationary natural gas engine application, and adverse effects on engine oil consumption and durability were also briefly considered. The modeling results suggest that ring-pack friction reduction is possible if the liner honing cross hatch angle is decreased by reducing the feed-to-speed ratio of the honing tool. Reducing the cross-hatch angle increased oil flow blockage and increased the lubricant’s effective viscosity during mixed lubrication. This allowed more load to be supported by hydrodynamic pressure, reducing ring-pack friction. However, there appeared to be a potential for increased oil consumption and scuffing tendency corresponding to a decrease in honing cross-hatch angle.
APA, Harvard, Vancouver, ISO, and other styles
3

Shatri, Vlora. "THE CORRELATION BETWEEN THE MODULUS OF DEFORMATION, E AND THE SOIL INTERNAL FRICTION ANGLE, ?" In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/12/s02.110.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Yu, Z. Z., and Y. B. Xie. "Study of the Piston System Structure of Advantageous to Low Friction and Economizing Energy." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1421.

Full text
Abstract:
There must be an end gap in the piston ring because of the need of mounting and compensation for diameter after the wear of ring. Richardson’ and many author’ studies have showed the effects of the end gap to blowby and oil consumption, especially in the presence of ring or liner wear. This problem has influenced the effective utilization of the fuel energy for many years. Moreover the ring will rotate in the working cycle of engine. Once the end gaps of two compression rings come to the site of superposition, the shortest passage of gas flow is formed and blowby will be increased. The deflection of crankpin and rotation of piston were calculated according to the analytical model based on the torque transmission theory of crankshaft. The positive and negative deflections of crankpin result in the reciprocating rotation of piston in the IC engine working cycle. The peak values of deflection and rotation are in the vicinity of crank angle position of deflagration. Because the clingy moment of compression rings are less than rotational resistance moment in a few section of crank angle, they are unable to keep synchronism with piston and the rotations opposite to piston occur. The rotation angle of the second compression ring is more than that of the first ring. The superposition of the end gaps of two compression rings comes about when they turn to the same angle position. Based on above study, the structure of one compression ring in piston system should be widely used, which is in favor of reduction of friction and engine weight, pushing forward the lightweight process, being useful to the decrease of fuel consumption and emission. The pressure of combustion gas will not remarkably descend in this structure. The problem of ring suspension and pressure release in the first ring land can be resolved. Two types of rings with complete seal and economizing energy design are showed for the structure of one ring, which will also avoid the increase of end gap after the rings are worn.
APA, Harvard, Vancouver, ISO, and other styles
5

Ye, Xiaoming, Guohua Chen, Maji Luo, and Yankun Jiang. "Three-Dimensional Analysis of Tribological Performance and Heat Transfer in Piston and Cylinder Liner System." In ASME 2003 Internal Combustion Engine and Rail Transportation Divisions Fall Technical Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/icef2003-0735.

Full text
Abstract:
A three-dimensional, hydrodynamic mixed lubrication model has been developed to investigate the frictional performance of piston ring and cylinder liner contact. The model is based on the average Reynolds equation and asperity contact approach with the considerations of surface roughness, rupture location, blowby through the piston ring pack and nonaxisymmetry in circumferential direction of cylinder liner. The equation has been solved cyclically using the finite difference method in a fully flooded inlet boundary condition and a flow-continuity Reynolds boundary condition for cavitation outlet zone. The oil film thickness, hydrodynamic pressure distribution, friction force and friction heat generated at the piston ring/cylinder liner interface are determined as the function of crank angle position. The results show that the shape of the cylinder liner (out-of-roundness) significantly affects the lubrication performance of the piston ring pack. A heat transfer model has been presented to evaluate the effects of friction heat on the temperatures of piston and cylinder liner system. The friction heat is added on the piston ring/cylinder liner interface as the flux boundary condition. The temperature fields of piston and cylinder liner system are acquired by the FEM, which reveal the distribution of the friction heat in this system. The results show that the friction heat mainly affects the temperature on the region near the top ring groove of the piston ring pack. The effect decreases at the region away from the top ring groove, especially at the piston skirt. The effect of friction heat on the temperature of cylinder liner is smaller than that of piston ring pack.
APA, Harvard, Vancouver, ISO, and other styles
6

O’Rourke, Bryan, Donald Radford, and Rudolf Stanglmaier. "Tri-Axial Force Measurements on the Cylinder of a Motored SI Engine Operated on Lubricants of Differing Viscosity." In ASME 2009 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ices2009-76037.

Full text
Abstract:
Friction is a determining factor in the efficiency and performance of internal combustion engines. Losses in the form of friction work typically account for 10–20% of an engine’s output. Improvements in the friction characteristics of the power cylinder assembly are essential for reducing total engine friction and improving the mechanical efficiency of internal combustion engines. This paper describes the development and implementation of a new concept of the ‘floating liner’ engine at Colorado State University that allows 0.5 crank angle degree resolved measurement of the forces on the cylinder along 3 axes — in the axial direction, the thrust direction, and along the wrist pin. Three different lubricants with differing properties were tested to observe the friction characteristics of each. Experimental results showed that the floating liner engine was able to resolve changes in friction characteristics coinciding with changes in lubricant viscosity and temperature. Axial force increases at TDC and BDC were observed as lubricant viscosity was decreased and larger amounts of mixed and boundary lubrication began to occur. For each test the axial friction force data was used to calculate total cycle friction work. The thrust and off-axis (wrist pin direction) forces are discussed under the same circumstances.
APA, Harvard, Vancouver, ISO, and other styles
7

Ejakov, Mikhail A. "Modeling of Axial and Circumferential Ring Pack Lubrication." In ASME 2001 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-ice-433.

Full text
Abstract:
Abstract The ring-pack lubrication is a complicated physical process involving multiple physical phenomena. This paper presents an attempt to model the ring-pack lubrication in three-dimensional space, considering the ring-bore structure interaction, bore distortion, ring-twist, piston secondary motion, non-Newtonian lubricant behavior, and ring/bore asperity contacts. The physics of the model includes the interface between the structure of the ring, oil lubricant, and the structure of the cylinder liner. The ring is modeled as a three-dimensional FEA model with the nodes along the ring circumference. The ring face orientation changes circumferentially depending on ring geometry as well as piston tilt angle and three-dimensional ring twist angle at every crank angle degree. The oil lubrication is modeled with the Reynolds equation with shear thinning and temperature dependent oil viscosity and with or without the flow factors. The cylinder liner description allows three-dimensional bore distortion and ring/liner asperity contact to be modelled. The key of the analysis is solving simultaneously at every crank angle increment a set of coupled linear and non-linear equations of ring structure, ring face lubrication, bore distortion, and asperity contact. The model predicts variations of the ring-pack lubrication in the axial and circumferential directions. Using the hydrodynamic lubrication model coupled with the asperity contact model allows calculations of the friction forces due to asperity contact (boundary and mixed lubrication) and oil film interactions (hydrodynamic and mixed lubrication). The transition from hydrodynamic lubrication to boundary lubrication through mixed lubrication is determined interactively based on ring / liner surface properties, ring loads, and lubrication properties. The new friction sub-module calculates axial and circumferential variation of both types of friction forces as well as total friction. The asperity contact induced friction forces and asperity contact pressure can further be used for ring wear calculations. The developed model has been applied to determine the performance of a production engine ring-pack. The influence of different phenomena affecting the ring-pack performance has been analyzed and compared.
APA, Harvard, Vancouver, ISO, and other styles
8

Schäfer, Johannes, Roberto Leidhold, and Frederik Achilles. "Steer-by-Wire: Universal Calculation of Production-Dependent, Strongly Fluctuating Friction in Steering." In Automotive Technical Papers. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-5082.

Full text
Abstract:
&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;In steer-by-wire (SbW) vehicles, understanding the steering rack force is essential to replicate a realistic steering feel, allowing conclusions to be drawn about road surface conditions by the decoupled manual actuator. Since internal friction varies with each steering system manufactured and installed, these models differ greatly in accuracy. This paper presents a concept for continuously calculating fluctuating friction based on the internal steering variables to avoid additional and complex individual measurements. An SbW system offers the right approach by adjusting the driver’s desired steering angle and the required motor control. The underlying steering clearance and the Kalman filter are used to calculate the steering rack force. The validity of the proposed concept is shown in drive tests according to ISO 13674 and ISO 7401 to gauge high and low friction values in different speed ranges.&lt;/div&gt;&lt;/div&gt;
APA, Harvard, Vancouver, ISO, and other styles
9

Lapcik, Lubomir, Ivo Krasny, Ivana Kupska, and Barbora Barbora Lapcikova. "Effect of low temperature air plasma treatment on physico-chemical properties of kaolinite." In 13th International Conference on Plasma Surface Engineering September 10 - 14, 2012, in Garmisch-Partenkirchen, Germany. Linköping University Electronic Press, 2013. http://dx.doi.org/10.3384/wcc2.364-367.

Full text
Abstract:
It was found in this study that air plasma treatment of particular kaolinite has led to the change of its wettability. This was reflected in the decreased values of water contact angles of wetting. There were determined yield locus and flow function dependencies at different stress levels for virgin and different time plasma treated samples (flow index - ffc, effective angle of internal friction - phie, unconfined yield strength - sigmac). It was found that by plasma treatment the character of the flow was shifting from region of very cohesive (ffc = 2.39) to the cohesive (ffc = 3.19). For untreated samples effective angle of internal friction was decreased with increasing applied consolidation stress, while for plasma treated kaolinite it was increased.
APA, Harvard, Vancouver, ISO, and other styles
10

Zhu, Jiangnan, Xiying Wang, Changxian Zhang, and Hui Miao. "Shape Optimization of Partly Removed Straight Ribs in Turbine Internal Rectangular Cooling Channel With 45 Degree Ribs." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75221.

Full text
Abstract:
Angled ribs have been widely used in the rectangular internal cooling channel of gas turbine to enhance heat convection strength and the optimal rib parameters have been shown in the former investigations. However, the heat transfer strength of the wall near the terminal of angled ribs is less enhanced by the rib and the local Nusselt number ratio may be lower than 1, which means that the local heat transfer strength of the ribbed wall is lower than that of smooth wall. At the same time, the ribs also generate large friction loss. As a result, a part of ribs which provides little heat transfer enhancement effect are removed in order to both reduce friction loss and maintain or enhance local heat transfer strength. In order to find out the optimal geometry parameters of the removed part of the rib, the optimization study are conducted in this paper based on the ANSYS Workbench software. The channel width to height ratio is 1 and 4. The rib attack angle is 45 degrees. The length of removed part, the transverse location of the removed part and the angle between the flow direction and the incision edge are chosen as the design variables. The area-averaged Nusselt number ratio and temperature on the ribbed wall, the friction factor ratio of the channel and the thermal performance factor are chosen as the objectives. The samples are generated by Latin Hypercube Sampling method and the CFD calculation is conducted by ANSYS CFX module using SST turbulence model. The response surface is obtained by Kriging model based on the CFD results and the Pareto optimal solution of this multi-objective problem is conducted by Multi-Objective Genetic Algorithm (MOGA) in the Response Surface Optimization module of ANSYS Workbench. The results show that the removed part of rib could both maintain or slightly enhance the overall Nusselt number ratio and obviously reduce the friction factor at the same time. Furthermore, the Nusselt number ratio in the terminal region of original ribs is also largely enhanced.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Angel of internal friction"

1

Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

Full text
Abstract:
Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
APA, Harvard, Vancouver, ISO, and other styles
2

Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

Full text
Abstract:
Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibratory table. The results show an increase in density with the increase in amplitude and frequency of vibration. However, the increase in density with the increase in amplitude of vibration is more pronounced for the coarse aggregates than for the sands. A comparison of the maximum dry densities of different test materials shows that the dry densities obtained after compaction using the vibratory hammer are greater than those obtained after compaction using the vibratory table when both tools were used at the highest amplitude and frequency of vibration available. Large-scale vibratory roller compaction tests were performed in the field for No. 30 backfill soil to observe the effect of vibration frequency and number of passes on the compaction density. Accelerometer sensors were attached to the roller drum (Caterpillar, model CS56B) to measure the frequency of vibration for the two different vibration settings available to the roller. For this roller and soil tested, the results show that the higher vibration setting is more effective. Direct shear tests and direct interface shear tests were performed to study the impact of particle characteristics of the coarse-grained backfill materials on interface shear resistance. The more angular the particles, the greater the shear resistance measured in the direct shear tests. A unique relationship was found between the normalized surface roughness and the ratio of critical-state interface friction angle between sand-gravel mixture with steel to the internal critical-state friction angle of the sand-gravel mixture.
APA, Harvard, Vancouver, ISO, and other styles
3

Tehrani, Fariborz M., Kenneth L. Fishman, and Farmehr M. Dehkordi. Extending the Service-Life of Bridges using Sustainable and Resilient Abutment Systems: An Experimental Approach to Electrochemical Characterization of Lightweight Mechanically Stabilized Earth. Mineta Transportation Institute, 2023. http://dx.doi.org/10.31979/mti.2023.2225.

Full text
Abstract:
Bridges are critical components of transportation infrastructure. This research addresses the need to extend the service life of bridges by improving the safety and reliability of bridge abutments and reducing their life-cycle cost and footprints. Mechanically stabilized earth (MSE) is a known strategy to enhance the economy and performance of bridge abutments. In addition, the application of rotary-kiln-manufactured lightweight aggregate backfills improves the performance of MSE bridge abutments with a leaner structural system. Such improvements include a reduction of structural demands due to a lower density, free drainage of granular materials, a high internal friction angle, less settlement with no consolidation, and accelerated construction requiring less compaction effort. This project aims to assess the electrochemical properties of expanded shale, clay, and slate (ESCS) aggregates and their influence on the corrosion of embedded steel strips. The experimental methodology involves evaluating current testing methods to measure electrical resistivity, pH, sulfate, chloride, and corrosion considering various gradation, moisture, dilution, and curing conditions. Samples represent available sources of ESCS with one source of normal weight aggregates for comparison. Results indicate the appropriateness of ESCS for addressing corrosion in MSE backfills. Further, outcomes provide guidelines to categorically predict the corrosivity of steel reinforcement when ESCS is employed as fill within MSE systems. These guidelines can help optimize the design and reduce the need to maintain and rehabilitate bridges, abutments, and approach and departure slabs on roadways to keep transportation systems safe and cost-efficient for sustainable infrastructure.
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, Xiao, D. M. Photiadis, J. A. Bucaro, et al. Low Temperature Internal Friction of Diamond-Like Carbon Films. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada446596.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Freels, M., P. K. Liaw, E. Garlea, J. S. Morrell, and M. Radiovic. Elastic Properties and Internal Friction of Two Magnesium Alloys at Elevated Temperatures. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1017409.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Cao Romero, Julio A., Jorge Reyes-Avendaño, Julio Soriano, Leonardo Farfan-Cabrera, and Ali Erdemir. A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears. SAE International, 2022. http://dx.doi.org/10.4271/2022-01-0320.

Full text
Abstract:
In contrast to conventional powertrains from internal combustion engine vehicles (ICEV), the tribological performance of powertrains of electric vehicles (EVs) must be further evaluated by considering new critical operating conditions such as electrical environments. The operation of any type of electric motor produces shaft voltages and currents due to various hardware configurations and factors. Furthermore, the common application of inverters intensifies this problem. It has been reported that the induced shaft voltages and currents can cause premature failure problems in tribological components such as bearings and gears due to accelerated wear and/or fatigue. It is ascribed to effects of electric discharge machining (EDM), also named, sparking wear caused by shaft currents and poor or increasingly diminishing dielectric strength of lubricants. A great effort has been done to study this problem in bearings, but it has not yet been the case for gears. Considering that EVs powertrains can be configurated with an electric motor coupled to a single-speed or multi-speed transmission, it is expected that shaft currents can also affect gears to some extent. The pin-on-disc test has been widely used to study sliding wear of gear materials under comparable or realistic operating conditions. This accelerated test is effective for screening materials, lubricants and operating conditions allowing evaluations of their friction and wear properties. However, it has not been implemented for studying gear materials under electrified environments. Thus, this paper aims to explore the friction coefficient and wear of gear materials under non-electrified and electrified sliding in a pin-on-disc tester applying typical of EVs powertrain shaft currents during sliding. The tests were carried out at two different DC currents under comparable gear dry and lubricated sliding contact conditions. Friction coefficient, wear volumes and morphologies were evaluated and reported in this work.
APA, Harvard, Vancouver, ISO, and other styles
7

Petzke, Jonas, Dennis Kleinschmidt, and Florian Brüning. Simulative approach for predicting the heating behavior of elastomers in the solid-state microwave heating process. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.ms.2.

Full text
Abstract:
The increasing demand for energy efficient vulcanization of rubber extrusions requires the optimization and further development of existing processes. Microwave vulcanization allows the energy required for this process to be coupled directly into the material via dielectric losses. Microwave heating requires the polarity of the rubber so that the electromagnetic wave can cause the polar components of the material to vibrate. These vibrations cause internal friction, resulting in an increase in the temperature of the rubber compound. In this research project, microwaves were used to heat a rubber strand placed in a specially prepared waveguide. This method offers advantages over conventional methods, such as hot air vulcanization. A key advantage is that the energy is coupled directly into the material, resulting in low losses. In contrast to hot air vulcanization, where the air must first be heated, the heating of the material also takes place within the product to be heated. This results in a significant increase in energy efficiency, reaching up to 90 %. In addition, internal heating provides a more homogeneous heat distribution in the rubber strand compared to external heating by hot air vulcanization. To predict the heating behavior of rubber in the microwave process, a simulative model is created in the multiphysics simulation environment CST Studio Suite®. The model describes the microwave heating behavior of rubbers based on the thermodynamic and electromagnetic material data of the rubber compound. This simulation is known as a bi-directional simulation, so that temperature-dependent variables such as dielectric loss and thermal conductivity can be considered. The model is used to analyze parameter variations of the electromagnetic wave frequency, waveguide geometry, and strand orientation in the waveguide. Finally, optimized settings for the real process are recommended.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Angel of internal friction' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography