Academic literature on the topic 'Shear-sliding mechanism'
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Journal articles on the topic "Shear-sliding mechanism"
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Li, Rong Jian, Qiang Xu, Wen Zheng, and Hung Chou Lin. "The Instability Mechanism of the Down TuDiLing Landslide." Advanced Materials Research 393-395 (November 2011): 1558–61. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1558.
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By making use of the developed strength reduction finite element codes based on which the matric suction can be considered, the sliding mechanism of the Down TuDiLing slope is analyzed. The results show that the stability of the Down TuDiLing slope is stable under the condition of employing the peak shear strength of soil and the lose of matric suction, but under the condition of the residual shear strength, the safety factor of the slope is decreasing to instability with the weakening of the matric suction, and a local sliding surface occurs. Through the strength reduction finite element computation, the position of the local sliding surface of slope can be differentiated and determined, so the problem of the local sliding should be paid to more attention in the reinforcement design.
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Saitoh, Ken-ichi, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi, and Ryuketsu Chin. "Molecular Dynamics Study on Lubrication Mechanism in Crystalline Structure between Copper and Sulfur." Journal of Materials 2015 (October 26, 2015): 1–13. http://dx.doi.org/10.1155/2015/963257.
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To clarify the nanosized mechanism of good lubrication in copper disulfide (Cu2S) crystal which is used as a sliding material, atomistic modeling of Cu2S is conducted and molecular dynamics (MD) simulations are performed in this paper. The interatomic interaction between atoms and crystalline structure in the phase of hexagonal crystal of Cu2S are carefully estimated by first-principle calculations. Then, approximating these interactions, we originally construct a conventional interatomic potential function of Cu2S crystal in its hexagonal phase. By using this potential function, we perform MD simulation of Cu2S crystal which is subjected to shear loading parallel to the basal plane. We compare results obtained by different conditions of sliding directions. Unlike ordinary hexagonal metallic crystals, it is found that the easy-glide direction does not always show small shear stress for Cu2S crystal. Besides, it is found that shearing velocity affects largely the magnitude of averaged shear stress. Generally speaking, higher velocity results in higher resistance against shear deformation. As a result, it is understood that Cu2S crystal exhibits somewhat liquid-like (amorphous) behavior in sliding condition and shear resistance increases with increase of sliding speed.
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Gevaert, Matthew R., Martine LaBerge, Jennifer M. Gordon, and John D. DesJardins. "The Quantification of Physiologically Relevant Cross-Shear Wear Phenomena on Orthopaedic Bearing Materials Using the MAX-Shear Wear Testing System." Journal of Tribology 127, no. 4 (June 1, 2005): 740–49. http://dx.doi.org/10.1115/1.2000272.
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Background: The occurrence of multi-directional sliding motion between total knee replacement bearing surfaces is theorized to be a primary wear and failure mechanism of ultra-high molecular weight poly(ethylene) (UHMWPE). To better quantify the tribologic mechanisms of this cross-shear wear, the MAX-Shear wear-testing system was developed to evaluate candidate biomaterials under controlled conditions of cross-shear wear. Method of approach: A computer controlled traveling x-y stage under a 3 degree-of-freedom statically loaded pin is used to implement the complex multi-directional motion pathways observed during TKR wear simulation. A MHz collection of dynamic x-y friction was available on all six environmentally controlled stations. The functionality of this testing platform was proven in a 100,000 cycle, 11.6 MPa, wear test using 15.0 mm diameter polished stainless steel spheres against flat GUR4150 UHMWPE. A five-pointed star wear pattern was used to incorporate the physiologically relevant cross-shear sliding conditions of stop/start, 50mm∕s entraining velocity and five crossing angles of 72°. Using normalized volumetric reconstruction of the resulting surface damage, a direct quantitative relationship between linear and cross-shear surface damage intensity was obtained. Results: Cross-shear surface damage volume loss was found to be 2.94 (±0.88) times that associated with linear sliding under identical tribologic conditions. SEM analysis of linear wear damage showed consistent fibril orientation along the direction of sliding while cross-shear wear damage showed multi-directional fibril orientations and increased surface roughness. Significant increases in discrete crossing-point friction coefficients were recorded throughout testing. Conclusions: This scientific approach to quantifying the tribologic effects of cross-shear provides fundamental wear mechanism data that are critical in evaluating potential biomaterials for use as in vivo bearings. Relevant multi-axis, cross-shear wear testing is necessary to provide quantifiable measures of complex biomaterials wear phenomena.
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Ma, Minghui, Fenhua Ren, and Wensheng Liu. "Experimental Investigation on Shear Failure Mechanism of Rock Mass with Intermittent Joints." Advances in Civil Engineering 2021 (March 16, 2021): 1–10. http://dx.doi.org/10.1155/2021/6623148.
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There are a large number of discontinuous weak planes distributed in the natural rock mass, which makes the sliding failure of rock mass along the intermittent structural plane very complex. To investigate the shear failure mechanism of rock mass with intermittent joints and study the influence of different joint heights on the shear failure mode of the rock mass, direct shear tests were carried out by presetting a series of jointed rock specimens with different undulating heights. During the shear loading, digital image correlation (DIC) technology was employed to monitor the surface strain field of the specimens in real time. The results show that the fluctuation height has a significant effect on the evolution of shear strain. With the increase of shear load, the maximum shear strain of the jointed specimens with different undulating heights first increases slowly and then increases rapidly. When the undulating height is 5 mm, the failure of the specimen is dominated by the rock sliding along prefabricated joints. When the undulating height is larger than 10 mm, the shear fracture of the rock becomes dominant. With the increase of the undulating height, more penetrating cracks perpendicular to the preexisting joints appear between the serrated surfaces, and the shear fracture phenomenon is more obvious.
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Zhu, Yuxuan, Fuchu Dai, and Xin Yao. "Preliminary understanding of the emplacement mechanism for the Tahman rock avalanche based on deposit landforms." Quarterly Journal of Engineering Geology and Hydrogeology 53, no. 3 (October 8, 2019): 460–65. http://dx.doi.org/10.1144/qjegh2019-079.
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Based on remote sensing interpretation, detailed field investigation of the deposit landforms and previous research, we propose that the emplacement mechanism of the Tahman rock avalanche, a giant Holocene rock avalanche, can be divided into three distinct phases: an extension-dominated sliding phase, a lateral shear-dominated sliding phase and a compression-dominated sliding phase.
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Li, Jun, Bin Li, Kai He, Yang Gao, Jiawei Wan, Weile Wu, and Han Zhang. "Failure Mechanism Analysis of Mining-Induced Landslide Based on Geophysical Investigation and Numerical Modelling Using Distinct Element Method." Remote Sensing 14, no. 23 (November 30, 2022): 6071. http://dx.doi.org/10.3390/rs14236071.
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Underground mining activity in the karst mountain in southwestern China has induced several large-scale rocky landslides and has caused serious casualties. At present, there is a lack of systematic research on the formation mechanism of landslides in this area using multi-method fusion technology. First, the orthophoto images of the landslide area obtained by UAV photography were used to analyze the deformation characteristics of the landslide. Second, the failure characteristics of the strata overlying the goaf were analyzed by geophysical detection. Finally, the deformation response characteristics of the mountain under underground mining were analyzed by UDEC numerical simulation. The results revealed that during the underground mining, the failure process of the mountain occurred in four stages: fracture expansion, subsidence and collapse, shear sliding, and multi-level sliding. Gently dipping soft–hard alternant strata and a blocky rock mass structure formed the geological foundation of the landslides. Underground mining accelerated the fracturing of the overlying strata and the formation of a stepped penetrating sliding surface. Tensile movement of the structural planes of hard sandstone in the free face, and shear sliding of the weak mudstone layer, were the main causes of the landslides. The slope instability mode was tension-shear fracturing, shear sliding, back toppling, and compressive shear failure. In addition, the fracture propagation in the overlying strata and damaged geological structure revealed by the geophysical detection were consistent with the simulation results. This study provides ideas for the precise countermeasures of disaster prevention and mitigation for similar landslides in this area.
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Nie, Lei, Min Zhang, and He Qing Jian. "Study on the Mechanism of the Landslide of Heda Expressway K377." Advanced Materials Research 255-260 (May 2011): 3437–43. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3437.
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During the construction of Heda expressway, the Ermi landslide, which occurred on section K377, has interrupted the construction of the expressway. Additional engineering geological investigation became necessary. The direct economic losses are over 3 million US dollars. This paper analyzed the Ermi landslide from the aspects of formation process, engineering geological conditions, the structural characteristics and stability analysis of the landslide. The results show that the formation of the Ermi landslide is mainly due to geological conditions in project area. Because the structure of the sliding body is loose and some weak interlayer exists in the slope, the shear strength of the sliding surface and sliding body is low. As cut-slope excavating, the resistant of the slope body reduced. Eventually the slope lost its stability and a landslide formed. In the stability analysis of the slope, the shear strength parameters of the sliding surface was determined by anti-analysis. Therefore, the result of the evaluation is closer to the actual conditions. Analyzing the stability of the three sliding surfaces respectively, the stability factors for initial slope are between 1.211 and 1.468, and the stability factors for current slope are between 0.958 and 1.076. Hence, the cut-slope excavation is the direct cause of the landslide.
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Xie, Wan-li, Qianyi Guo, Jason Y. Wu, Ping Li, Hui Yang, and Maosheng Zhang. "Analysis of loess landslide mechanism and numerical simulation stabilization on the Loess Plateau in Central China." Natural Hazards 106, no. 1 (January 15, 2021): 805–27. http://dx.doi.org/10.1007/s11069-020-04492-w.
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AbstractLoess landslides have complicated deformation mechanisms. Accurately describing the internal failure deformation of loess landslides and establishing a theoretical method of landslide instability evaluation for the prevention of subsequent landslides have become important topics in western development project construction in China. This paper presents a case study of the Zhonglou Mountain landslide in Shaanxi Province, China. Based on field investigation results, a two-dimensional stability analysis model was constructed using the finite element method. Taking the deformation characteristics of the landslide as the research basis, the distribution laws of the displacement, stress, and shear strain of this landslide were identified with the strength reduction finite element numerical simulation method. Additionally, the safety factor was evaluated under normal and storm conditions. The numerical simulation results show that the horizontal tensile stress of the landslide was mainly distributed in the middle and upper parts of the landslide under normal conditions, while the vertical tensile stress was distributed near the sliding surface. Under heavy rainfall, the sliding force increased, and the anti-sliding force and anti-sliding section decreased; the location of the maximum shear strain shifted down from the middle and upper parts of the landslide body to the area with a shear crack, and the plastic shear strain area expanded along nearly the entire the sliding surface, leading to the occurrence of a landslide. Thus, the use of anti-slide piles to stabilize the landslide was proposed and tested. Monitoring points were arranged along the sliding surface to evaluate the displacement, stress, and strain responses. The on-site observation results agreed with the modeling results. The use of anti-slide piles was demonstrated to be an effective stabilization method for the Zhonglou Mountain landslide.
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Hooyer, Thomas S., and Neal R. Iverson. "Flow mechanism of the Des Moines lobe of the Laurentide ice sheet." Journal of Glaciology 48, no. 163 (2002): 575–86. http://dx.doi.org/10.3189/172756502781831160.
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AbstractRapid flow of the Des Moines lobe of the Laurentide ice sheet may have been related to its unlithified substrate. New reconstructions of the lobe, based on moraine elevations, sediment subsidence during moraine deposition, and flow-direction indicators, indicate that the lobe may have been ∼3 times thicker than in previous reconstructions. Nevertheless, implied basal shear stresses are <15 kPa, so internal ice deformation was not significant. Instead, the lobe likely moved by a combination of sliding, plowing of particles through the bed surface, and bed shear. Consolidation tests on basal till yield preconsolidation stresses of 125–300 kPa, so effective normal stresses on the bed were small. A model of sliding and plowing indicates that at such stresses most particles gripped by the ice may have plowed easily through the till bed, resulting in too small a shear traction on the bed to shear it at depth. Consistent with this prediction, measurements of orientations of clasts in basal till yield a weak fabric, implying pervasive bed shear strain less than ∼2, although some stronger fabrics have been reported by others. We infer, tentatively, that movement was principally at the bed surface by plowing.
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Guo, Wei, Yao Hu, Wenqi Hou, Xia Gao, Dan Bu, and Xu Xie. "Seismic Damage Mechanism of CRTS-II Slab Ballastless Track Structure on High-Speed Railway Bridges." International Journal of Structural Stability and Dynamics 20, no. 01 (November 22, 2019): 2050011. http://dx.doi.org/10.1142/s021945542050011x.
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China Railway Track System II (CRTS II) slab ballastless track structure is one of commonly adopted track systems on the high-speed railway bridge, which has been found seismically vulnerable under strong earthquakes. To investigate the earthquake-induced damage mechanism of the CRTS II slab ballastless track structure, a nonlinear numerical model of typical 7-span simply supported bridge–track system was established by the finite element software OpenSees and well calibrated by the test data and relative literatures. The nonlinear time history analysis was employed to calculate seismic responses of bridge and track parts under a suite of 10 seismic records. Results demonstrate that the sliding layer in the track structure is the most damage-prone component, especially at the bridge-subgrade transition section, and the shear alveolar may also sustain earthquake-induced fail. By analyzing the seismic damage mechanism of the track structure, this paper reveals that the nonuniform displacement responses of the girders and friction plate at the bridge-subgrade transition section are main factors that result in the extensive damage of the sliding layer and failure of the shear alveolar. However, the damage of these two components are beneficial to reduce the seismic responses of other components in the track structure and protect them from being damaged. From the perspective of engineering safety, the sliding layer and shear alveolar should be rigorously designed because the residual displacement of the sliding layer increases along with the maximum displacement and the failure of the shear alveolar may make the whole track structure failed.
Dissertations / Theses on the topic "Shear-sliding mechanism"
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Pham, Van Tien. "MECHANISMS AND HAZARD ASSESSMENT OF RAINFALL-INDUCED LANDSLIDE DAMS." Kyoto University, 2018. http://hdl.handle.net/2433/231989.
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付記する学位プログラム名: グローバル生存学大学院連携プログラムKyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第21056号
工博第4420号
新制||工||1687(附属図書館)
京都大学大学院工学研究科社会基盤工学専攻
(主査)教授 寶 馨, 教授 角 哲也, 准教授 佐山 敬洋
学位規則第4条第1項該当
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Vouaillat, Guillaume. "Analyse de la fatigue de contact d'engrenages aéronautiques." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI035.
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Le micro-écaillage est une défaillance en fatigue de contact qui intervient sur les composants de transmissions mécaniques tels que les roulements et les engrenages. Le plus souvent, il est le résultat d’un manque de lubrification ou d’un écart avec les spécifications d’état de surfaces. La conséquence est alors l’apparition de sur-contraintes dans le matériau qui évoluent vers des arrachements microscopiques de matière. Ces derniers sont appelés micro-écailles et peuvent éventuellement amener à des dysfonctionnements de la transmission dans laquelle les pièces impactées sont en jeu. La littérature a alors mené de nombreuses études à ce sujet mais manque de travaux liant dans la même analyse, la représentation de l’état de surface à l’origine de la défaillance d’une part et la simulation d’un état microstructural du matériau sollicité qui rentre en compte dans les mécanismes de création de la fatigue de contact, d’autre part. Les travaux de cette thèse présentent donc d’abord, un modèle regroupant ces deux caractéristiques, construit à partir des outils et théories de la littérature. Une étude paramétrique est alors conduite et permet d’estimer l’influence de plusieurs paramètres de contact (glissement, frottement, pressions, rugosité) sur les résultats de trois critères en fatigue de contact. La mise en place d’un critère complémentaire est alors nécessaire pour apporter des précisions là où les premiers critères semblent insuffisants. A partir de l’étude des contraintes de cisaillement au niveau des joints de grains du matériau, la prise en compte de l’historique complet de la sollicitation est possible. Elle permet notamment de proposer une durée de vie avant initiation des microfissures et d’identifier dans le cas du glissement, des cycles locaux complémentaires de sollicitation. Ces derniers résultent des passages répétés des pics rugueux en surface du matériau. Finalement, une comparaison avec une application expérimentale sur composant denture d’engrenages apporte des éléments d’identification des zones à risque vis-à-vis du micro-écaillage dans les applications concernéesGears and rolling elements that are parts of transmissions are sometimes subjected to rolling contact fatigue failures as micro-pitting. It usually results from a lubrication loss or an uncontrolled surface finishing. First layers of the material are consequently overstressed. Microscopic material wrenching then occurs and is called micro-pitting. Such transmission parts failures may potentially lead to the whole system dysfunction. Several studies have already been performed in the literature concerning this topic. However, few of them take into account both surface roughness and material microstructure analyses which impact rolling contact fatigue mechanisms. Thus, a model with those characteristics is developed from literature theories and tools and presented in this thesis. A parametrical study is then conducted so as to estimate the influence of specific contact parameters (among sliding, friction, pressure and roughness) on three fatigue criteria results. However the use of an additional criterion is necessary in order to give more accurate conclusions. Intergranular shear stresses are subsequently studied and make the analysis of the complete stress history possible. Moreover, a life expectancy to micro-cracks nucleation is computed. An identification of sliding-linked local shear stress oscillations which result from successive rough peaks passing over the material surface is also made. Finally, numerical results are compared to an experimental investigation conducted on FZG-type gears. The most at risk areas regarding micropitting in the relevant applications are thus identified among the addendum, the dedendum and the pitch
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Chen, Yongjian. "Quantifying the compressive ductility of concrete in RC members through shear friction mechanics." Thesis, 2015. http://hdl.handle.net/2440/95248.
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This thesis contains a series of journal papers in which the compressive ductility of concrete in RC members has been quantified through shear friction mechanics. Firstly, the size dependent stress‐strain models for unconfined and actively confined concrete are derived based on the fundamental mechanics of shear friction theory. At this stage, the shear friction properties, that is the relationship between the shear stress, normal stress, crack widening and interface slip across the sliding plane, are not specifically required. It is shown how the stress‐strain from cylinder tests of one specific length can be modified to determine that for any size of cylinder. Moreover, it is shown that the proposed approach can be used to make existing generic stress/axial‐strain relationships size dependent and these size dependent relationships can be directly used to determine the corresponding size dependent stress/lateral‐strain relationship. Being mechanics based, size dependent stress‐strain models reduce the reliance on vast experimental testing as only one size of specimen needs be tested to obtain stress‐strain relationships for all sizes. Secondly, the shear friction properties, that is the relationship between the shear stress, normal stress, crack widening and interface slip across the sliding plane is derived and presented in a generic form suitable for application. These generic shear‐friction material properties are then used to simulate and quantify the shear‐sliding behaviour of initially uncracked concrete generally obtained directly from relatively expensive tests. In addition, it is also shown how these shear‐sliding capacities can then be used to quantify the shear capacity of RC beams without stirrups and without the need for size factors as the mechanics based approach automatically, through mechanics, allows for member size. Thirdly, the generic shear‐friction material properties derived in Chapter 3 are used to simulate passive confinement in FRP confined cylinders. Importantly, two distinct cylinder failure modes have been identified and examined: that of the circumferential wedge that is common in standard cylinders with aspect ratios of 2:1; and that of the single sliding plane that occurs at higher aspect ratios. It shows the mechanics solutions for the influence of specimen size, that is both diameter and height, on the stress‐strain relationship of axially loaded FRP confined concrete cylindrical specimens and how small scale FRP wrapped specimens suitable for compression testing can be designed so that the stress/strain relationship of the full scale member under pure compression can be extracted from those of the small test specimen. Finally, a series test of steel tube confined concrete columns is designed to verify the accuracy of the size effect expressions proposed in previous chapters. Importantly, it shows that because the standard material test always adopts small scale 2:1 aspect ratio specimens, the majority failure mode in material test specimens is the circumferential wedge failure. Consequently it is for this wedge failure mode that most axial‐stress/global-axial‐strain relationships are developed. However, similar to the specimens studied in this test program, the aspect ratio of most practical steel tube confinement columns is more than 2. Hence only in a minority of cases does the circumferential wedge failure occur in practice. Therefore, the empirical or semi‐empirical equations developed from small scale concrete specimens are not truly representative of the actual behaviour of full‐scale columns which have aspect ratios markedly different from the 2:1 ratio most commonly tested.Thesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2015
Book chapters on the topic "Shear-sliding mechanism"
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Kocharyan, Gevorg G., Alexey A. Ostapchuk, and Dmitry V. Pavlov. "Fault Sliding Modes—Governing, Evolution and Transformation." In Springer Tracts in Mechanical Engineering, 323–58. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_15.
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AbstractA brief summary of fundamental results obtained in the IDG RAS on the mechanics of sliding along faults and fractures is presented. Conditions of emergence of different sliding regimes, and regularities of their evolution were investigated in the laboratory, as well as in numerical and field experiments. All possible sliding regimes were realized in the laboratory, from creep to dynamic failure. Experiments on triggering the contact zone have demonstrated that even a weak external disturbance can cause failure of a “prepared” contact. It was experimentally proven that even small variations of the percentage of materials exhibiting velocity strengthening and velocity weakening in the fault principal slip zone may result in a significant variation of the share of seismic energy radiated during a fault slip event. The obtained results lead to the conclusion that the radiation efficiency of an earthquake and the fault slip mode are governed by the ratio of two parameters—the rate of decrease of resistance to shear along the fault and the shear stiffness of the enclosing massif. The ideas developed were used to determine the principal possibility to artificially transform the slidding regime of a section of a fault into a slow deformation mode with a low share of seismic wave radiation.
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de Jong, G. De Josselin. "Elasto-plastic version of the double sliding model in undrained simple shear tests." In Soil Mechanics and Transport in Porous Media, 44–67. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/978-1-4020-3629-3_6.
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Li, Hao, and Xiaojun Li. "A Testing Device for Shear Strength of Sliding-Zone Soil and Its Application." In Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 54–61. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_6.
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Su, Miau-Bin, I.-Hui Chen, Shei-Chen Ho, Yu-Shu Lin, and Jun-Yang Chen. "Long-Term Monitoring of Slope Movements with Time-Domain Reflectometry Technology in Landslide Areas, Taiwan." In Landslides - Investigation and Monitoring. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.89809.
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The study employs time-domain reflectometry (TDR) technology for landslide monitoring to explore rock deformation mechanism and to estimate locations of potential sliding surfaces in several landslide areas, Taiwan, over ten years. Comparing to laboratory and field testing, sliding surfaces in landslide areas occurred mainly at two types, namely shear and extension failure. The TDR technology is used for field monitoring to analyze locations of sliding surfaces and to quantify the magnitude of the sliding through laboratory shear and extension tests. There are several TDR-monitoring stations in six alpine landslide areas in the middle of Taiwan for long-term monitoring. A relation between TDR reflection coefficients and shear displacements was employed for a localized shear deformation in the field. Furthermore, the type of a cable rupture for the TDR monitoring in landslides can be determined as shear, extension, or compound failure through the field TDR waveforms. Overall, the TDR technology is practically used for a long-term monitoring system to detect the location and magnitude of slope movement in landslide areas.
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Gao, Quanping, and Xiaoli Song. "Seepage Exploration on a Landslide in a Hydroelectric Power Station." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220950.
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Landslide stability analysis is the basement of landslide research. To study the influence of water on reservoir landslide stability, taking a landslide for example in a hydroelectric power station based on detailed field investigation and reservoir operation data, the geological conditions, reservoir and rainfall were considered, the slope failure pattern under natural state and rain state were simulated with Mohr-Coulomb criterion after an numerical three-dimensional model established by the fast Lagrange analysis of continua in 3-dunebsion. A simulation was made for the sliding direction under limit equilibrium situation. The change laws of stability were analyzed under self-gravity, rainfall and reservoir water fluctuation. The distribution characteristics of plastic deformation, displacement and potential sliding surface inside slope were intuitively showed under different conditions. From the point of instability mechanism, water is one of the important factors inducing landslide instability. The key block is suddenly broken with shear rupture that triggers landslide. It offers a reliable basis for both prediction of second landslide induced by rainfall and disaster prevention.
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Ovcharenko, A., G. Halperin, and I. Etsion. "On the mechanism of junction growth in pre-sliding." In Meso-Scale Shear Physics in Earthquake and Landslide Mechanics, 25–29. CRC Press, 2009. http://dx.doi.org/10.1201/b10826-5.
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Mate, C. Mathew, and Robert W. Carpick. "Lubrication." In Tribology on the Small Scale, 259–300. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199609802.003.0009.
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For situations where high friction is not explicitly needed, lubricants are used to reduce friction and wear to acceptable levels. Lubricants function mainly by introducing a layer of solid or liquid material with low shear strength between two sliding surfaces. This chapter covers the basic regimes of lubrication: hydrostatic, hydrodynamic, elastohydrodynamic, mixed, and boundary. Viscosity is the most important physical parameter describing a lubricant, and it is thoroughly discussed in this chapter. Slippage of lubricants and other liquids against solid surfaces is also discussed. The chapter also discusses the basic mechanisms and types of bearings that provide hydrodynamic and elastohydrodynamic lubrication.
Conference papers on the topic "Shear-sliding mechanism"
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Chavan, Datta S., Anupama Singh, Sapana, Ravleen Kaur Manocha, Jaywant Sankpal, Anamika Shukla, Indu, and Niranjana. "Wind turbine model testing using blower fan sliding mechanism to create wind shear." In 2017 International Conference on Energy, Communication, Data Analytics and Soft Computing (ICECDS). IEEE, 2017. http://dx.doi.org/10.1109/icecds.2017.8390220.
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Xu, H., and K. Komvopoulos. "Fracture Mechanics Analysis of Asperity Cracking Due to Repetitive Sliding Contact." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41162.
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Asperity failure due to repetitive sliding is a common process of wear particle formation. Linear elastic fracture mechanics and the finite element method (FEM) were used to analyze asperity cracking due to sliding against another rigid asperity. The maximum ranges of the tensile and shear stress intensity factors (SIFs) were used to determine the crack growth direction and the dominant mode of fracture. Simulations of repetitive sliding showed a strong dependence of the wear particle size and wear rate on the direction and rate of crack growth. The maximum ranges of tensile and shear SIFs were used to determine the dominant mode of crack growth. The effects of asperity interaction depth, sliding friction, initial crack position, crack-face friction, and material properties on crack growth direction, dominant fracture mode, and crack growth rate are discussed in the context of FEM results. It is shown that the asperity interaction depth and sliding friction exhibit the most pronounced effects on the crack growth direction and growth rate. A transition from shear- to tensile-dominant mode of crack growth was observed with the increase of the asperity interaction depth and/or sliding friction coefficient. Crack-face opening, slip, and stick mechanisms are discussed in the light of crack mechanism maps constructed for different asperity interaction depths and sliding friction coefficients.
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Sagapuram, Dinakar, and Koushik Viswanathan. "Viscous Shear Banding in Cutting of Metals." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6697.
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Shear banding is a type of plastic flow instability with often adverse implications for cutting and deformation processing of metals. Here, we study the mechanics of plastic flow evolution within single shear bands in two different (Ti and Ni-based) alloy systems. The local shear band displacement profiles are quantitatively mapped at high resolution using a special micro-marker technique. The results show that shear bands, once nucleated, evolve by a universal viscous sliding mechanism that is independent of microstructural details. The evolution of local deformation around the band is accurately captured using a simple momentum diffusion model by assuming Bingham flow rheology for the band material. The predicted band viscosity is very small, comparable to those of liquid metals. A plausible explanation for this small viscosity and fluid-like behavior at the band, based on phonon drag, is presented.
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Diaconescu, E. N., and M. L. Glovnea. "Tangential Interactions Arising When a Circular Rigid Punch Slides Over an Elastic Half-Space." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44387.
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The mechanism of surface interaction in dry sliding is attributed either to a constant friction coefficient or to a constant friction shear stress. This paper investigates these assumptions in the case of circular rigid punches sliding against the elastic half-space bounding plane. Normal displacements generated by these interactions are calculated. It is found that these do not comply with front surface of the punch in the case of a constant friction coefficient, whereas a perfect agreement arises when a constant friction shear stress is assumed.
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Deeks, Andrew, Hongjie Zhou, Henry Krisdani, Fraser Bransby, and Phil Watson. "Design of Direct On-Seabed Sliding Foundations." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24393.
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This paper describes a new framework for the geotechnical design of pipeline-related foundations (e.g. foundations for PLETs and Tees) designed to slide directly over the seabed during pipeline operation. This approach can present considerable savings in terms of fabrication and construction costs because of reduced foundation sizes. Over the design life, a pipeline is likely to endure many thermal/ pressure load cycles due to product and flow rate variations during operation. These cycles result in the foundation sliding back and forth across the seabed within a footprint. These loads and corresponding motions impose cyclic shear stresses on the soil that can (i) degrade foundation bearing capacity and (ii) cause additional foundation settlement. Often the key design consideration is whether or not the cumulative settlements will eventually compromise the integrity of the pipeline system to which the PLET and its associated foundation are attached. In addition to consolidation and creep, two key mechanisms are shown to control cyclic foundation settlement: (i) bearing mechanism induced burial and (ii) cyclic shear stress driven soil volume reduction. Their relative significance depends on the soil conditions (soil state) and input pipeline movements. The paper presents key aspects required for the design of direct on-seabed sliding foundations, including the soil parameters and associated testing required. Validation of the design approach is illustrated by comparison to laboratory model tests performed on carbonate soils. The impact of soil properties on potential foundation performance is illustrated with a design example and the importance of conducting site specific soil testing and settlement analyses is emphasised. It is also illustrated that close integration of the pipeline, structural and geotechnical analysis is necessary to reliably quantify system performance of these novel foundations.
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Zhu, Z., B. S. Xu, Y. Liu, Y. X. Chen, S. Ma, and Z. X. Li. "The Delamination Wear Mechanism of Thermally Sprayed Coating." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p1462.
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Abstract The delamination wear mechanism of the thermally sprayed coatings was studied by analyzing coatings structural feature and stress distribution on the warm surface, and the influencing factors on the delamination wear were discussed. And the delamination wear mode of coating was developed. The results show that, the thermally sprayed coatings have typical aspect of lamellar structure. There are oxide layers between splats, and there also exist porosity and micro-crack in the coatings. The coating surface was subjected to alternately tensile stress and compression stress caused by normal load and friction force during sliding. In a certain depth below the surface, there exists maximum shear stress. Therefore fatigue damage will take place at subsurface of the coating under alternate stress. The adhesion strength between splats of coating prepared by HVAS is by far lower than casting material because of lamellar structure. And the adhesion strength between splats is further weakened due to the defects (such as porosity and micro-crack) appearing mostly on the boundaries between thin oxide sheets and splats. When the fatigue damage accumulates to a certain value, micro-cracks initiate at the defects between splats. Then these micro-cracks grow, connect, and propagate along the defects between splats. Finally, these cracks shear to the coating surface leading to spallation of the splats, and thus wear debris is generated. By repeating the above process delamination of the coatings will occur. Reducing friction coefficient, increasing coatings hardness and adhesion strength between inter-splats are the basic methods to improve the wear resistance of thermally sprayed coatings. Abstract only; no full-text paper available.
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Gevaert, Matthew R., Martine LaBerge, Jennifer M. Gordon, and John D. DesJardins. "The Quantification of Physiologically Relevant Cross Shear Wear Phenomena on Orthopaedic Bearing Materials Using a Novel Wear Testing Machine." In ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64150.
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Background: Multi-directional sliding motions between total knee replacement materials is a suspected primary wear mechanism of ultra-high molecular weight poly(ethylene) (UHMWPE). Method of Approach: A wear testing machine was developed to quantify damage from crossing contact pathways on candidate biomaterials. A cyclic five-pointed star pattern was used to evaluate the tribological differences between linear and cross-motion surface tribology of stainless steel pins on flat UHMWPE. Results: Volumetric reconstruction of resultant damage showed that cross-shear volume loss was 2.94(± 0.88) times that of linear loss during testing. Conclusions: Basic multi-axis, cross-shear wear testing provides quantifiable measures of complex biomaterials wear phenomena.
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Meinshausen, Lutz, Ming Liu, Tae-Kyu Lee, Indranath Dutta, and Li Li. "Reliability Implications of Thermo-Mechanically and Electrically Induced Interfacial Sliding of Through-Silicon Vias in 3D Packages." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48124.
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In conjunction with micro bumps, Through-Silicon-Vias (TSVs) are used for die stacking, leading to reduced footprints and a higher performance due to shorter communication bus-length. However the large difference between the thermal expansion of silicon and copper and an increased temperature of the die stack due to Joule heating lead to shear stress at the interface between TSV and substrate. Temperature activated interfacial diffusion in combination with the shear stress leads to diffusional interfacial sliding, resulting in TSV pro- or intrusion. In addition, electromigration (EM) at the interface leads to TSV motion. Against this background the protrusion/intrusion of Cu TSVs (ø 10 μm, length 100 μm) during fast and slow rate thermal cycling (TC) and during EM experiments was investigated. Parallel to the experimental investigation a finite element analysis (FEA) was performed to study the micro-mechanical responses of Cu-filled TSV during thermal cycling. For this purpose interfacial sliding was incorporated into the FE model by diffusional creep mechanism. The FE model captures the main features being observed in experiments such as stress hysteresis and intrusion/protrusion of the TSV relative to Si substrate.
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Suzuki, Tomohiro, Kazuyoshi Ogawa, and Shoji Hotta. "Experimental Analysis and Life Prediction of Pitting Failures for Carburized Gear Material." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14378.
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Abstract In order to elucidate the mechanism and factors of tooth face pitting, roller tests were carried out. In the tests, the oxidized-nonmartensitic layer, surface roughness, case hardness and residual compressive stress were noted as the material factors, and sliding, oil temperature and viscosity were considered the running condition factors. As a result, the pitting could be classified into two forms according to the crack origin; subsurface origin pitting and surface origin pitting. In the former case, the pitting life coincided with the value estimated from the shear stress and shear strength related to the Vickers hardness. In the latter case, the influence of shot peening could be regarded as the sum of influences due to surface roughness, hardness and residual compressive stress. These factors of shot peening, the existence of the oxidized-nonmartensitic layer and specific sliding determined the life of the surface origin pitting. The life of tooth face pitting could be calculated using these roller test results.
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Sridhar, N., Q. D. Yang, and B. N. Cox. "Fiber Pullout Characteristics Under Dynamic Loading Conditions." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/ad-25305.
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Abstract Inertial effects in the mechanism of fiber pullout during dynamic propagation of a bridged crack are critically examined. By reposing simple shear lag models of pullout as problems of dynamic wave propagation, the effect of frictional coupling between the fiber and the matrix is accounted for in a fairly straightforward way. The frictional sliding between the fiber and the matrix is described by a constant interfacial friction stress, the sign of which depends on the relative particle velocity of the fiber and the matrix. Analytical solutions are derived when the load or bridging traction on the fiber in the crack plane increases linearly in time. The results show that when the wave speed of the matrix exceeds a critical value, the frictional fiber pullout behavior transitions from a state of pure slip to a state where part of the sliding zone slips and the remaining sticks. When stick occurs, the fiber and the matrix within the stick zone slide past each other with an interfacial shear stress less than the shear stress required for slipping. Regions of slip and stick propagate and increase with time and influence the time-dependent relationship between the crack opening displacement and the bridging tractions.
Reports on the topic "Shear-sliding mechanism"
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Lever, James, Susan Taylor, Arnold Song, Zoe Courville, Ross Lieblappen, and Jason Weale. The mechanics of snow friction as revealed by micro-scale interface observations. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42761.
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The mechanics of snow friction are central to competitive skiing, safe winter driving and efficient polar sleds. For nearly 80 years, prevailing theory has postulated that self-lubrication accounts for low kinetic friction on snow: dry-contact sliding warms snow grains to the melting point, and further sliding produces meltwater layers that lubricate the interface. We sought to verify that self-lubrication occurs at the grain scale and to quantify the evolution of real contact area to aid modeling. We used high-resolution (15 μm) infrared thermography to observe the warming of stationary snow under a rotating polyethylene slider. Surprisingly, we did not observe melting at contacting snow grains despite low friction values. In some cases, slider shear failed inter-granular bonds and produced widespread snow movement with no persistent contacts to melt (μ < 0.03). When the snow grains did not move and persistent contacts evolved, the slider abraded rather than melted the grains at low resistance (μ < 0.05). Optical microscopy revealed that the abraded particles deposited in air pockets between grains and thereby carried heat away from the interface, a process not included in current models. Overall, our results challenge whether self-lubrication is indeed the dominant mechanism underlying low snow kinetic friction.