Papers by Keyword: Sliding

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Authors: Jia Chun Wang, Na Li, Yun Peng Kou, Yu Lin Yang
Abstract: A better understanding of friction modeling is really important for producing more realistic finite element models of machining processes. This paper presents a methodology to determine the friction at the tool-chip interface. By matching the measured values of the cutting forces with the predicted results from finite element simulations (FEM), a revised friction model on the tool-chip interface is developed. Reasonable distribution of the stress, strain and strain-rate, as well as the temperature fields at the tool-chip interface could be achieved by using this approach. An attempt is made by FEM to obtain a full understanding of relationships between the complex physical behavior and friction at the tool-chip interface. It is found that the sticking-sliding separated area is located at the points with the greatest temperature. And the corresponding relationship between cutting parameters and sticking-sliding friction separated area is found.
Authors: Hisao Fukui, W. Yang, Shozo Tsuruta, K. Kaikawa, A. Sugimura, Shoji Takeda, Mitsuo Niinomi
Abstract: An intensive amplitude arrangement for reciprocal tribocontact of biomedical alloys, Ag-20.0Pd-14.5Cu-12.0Au, Au-5.0Pt-2.0Pd-9.2Ag-15.0Cu and Ti-29Nb-13Ta-4.6Zr was conducted in order to check the details of friction and wear alterations around the transition from fretting to sliding. It is shown that the friction force exhibits stagnation for the Ag alloy and decrease for the Au alloy and the Ti alloy in certain domain of oscillating amplitude. Beyond the domain the friction force increases with the amplitude, and below the lower threshold and above the upper threshold triboevent is complete fretting and sliding respectively. Observation of friction-force waveform and SEM topography found, a hybrid mechanism of fretting and sliding is dominant in the amplitude domain, and the strong adhesion between the self-mated alloys is responsible to this exhibition.
Authors: Kai Zeng, Xiao Cong He, Cheng Jiang Deng, Hui Yan Yang, Sen Zhou, En Liu
Abstract: Self-Pierce Riveting (SPR) is a new cold-press rivet technique for hard-to-weld materials joining in the field of automobile lightweight design and manufacture. The interlock slid under mechanical loading was the main induction factor to the failure of SPR joints. In this paper, the property of the interlock slid in SPR joints was studied by using digital image analysis technology and mechanical experiments. A special double-rivets specimen was designed, and simple tensile test was carried out. Several digital microscopes pointing to the region of the mechanical interlock were set up to observe and record synchronously the sequential images of the deformation of SPR during the tensile test. The process of image gray matching for the calculation of the interlock slid was described. Results showed that this method can be used to detect automatically the sliding in SPR joints and analyze the sliding qualitatively and quantitatively. And it can provide a new path for the mechanical property evaluation for this type joints.
Authors: B.M. Darinskii, Y. Kalinin, D.S. Sajko
Abstract: The geometrical classification of the intercrystalline general type boundaries with various misorientations of contacting crystals and orientations of boundary planes was suggested previously. An arbitrary grain boundary breaks up into three families of thermodynamically stable boundaries as a result of fragmentation process due to annealing of polycrystalline sample. Geometrical representations of linear defects (dislocation, steps) and point defects (vacancy, interstitials) in intercrystalline and interphase general type boundaries of different families are developed. Representations about thermal excitations of boundary are developed. Different kinetic processes responsible for intercrystalline sliding, migration are considered, and expressions for characteristics of the low-temperature and high-temperature internal friction grain boundary peaks are obtained. Explanations of internal friction peaks observed near to the so-called ‘grain boundary peak’ are given. Mechanisms of atomic reorganization of grain boundary responsible for the grain boundary phase transitions are also considered. Conditions for the creation of amorphous atomic structure into boundary near to the fusion temperature of a crystal are specified.
Authors: Dun Ben Sun, Qing Wen Ren
Abstract: For the instability problem of gravity dam sliding along base surface, cubic nonlinear constitutive model of soft material in base surface is adopted, which is usually expressed by Weibull model. Dynamic Equations of dam sliding along base surface is established. By means of catastrophe theory, the jumping and hysteresis phenomena of the vibration amplitude of the dam is analyzed, the parameter range of stable region in which amplitude doesn’t happen catastrophe is given and the factors which cause amplitude instability are discussed. The results obtained in the paper are of significant value for understanding the sliding instability mechanism of gravity dam under earthquake, as well as guiding the design of gravity dams.
Authors: Lorella Ceschini, Carla Martini, Giuliano Sambogna, Fabrizio Tarterini
Abstract: The present study focuses on the influence of the PEO (Plasma Electrolytic Oxidation) treatment on the tribological behaviour of the AA2618/20 % vol. Al2O3p composite, dry sliding against induction hardened UNI C55 steel. Particle-reinforced Al based composites offer a higher wear resistance by comparison with the corresponding unreinforced alloys, however, the presence of critical loads and/or velocities which lead to transition towards severe wear regime, was often observed. In such conditions, the composite can show higher wear rates than those of unreinforced alloys. For this reason, surface modifications, such as PEO, might contribute to improve wear resistance. In this paper, topography, microstructure, phase constitution and surface hardness of the PEO-treated composite were investigated and its tribological behaviour was studied by dry sliding tests using a block-on-ring tribometer. The results were compared with those from the uncoated composite, demonstrating a very positive effect of the PEO treatment, which moved transitions from mild to severe wear towards more severe test conditions, in terms of both load and velocity.
Authors: Alexander H. King
Authors: Ping Jun Tao, Yuan Zheng Yang, Xiao Jun Bai, Qiang Ru, Zhi Wei Xie
Abstract: The effect of load on linear reciprocating sliding friction and wear behavior in a Zr55Cu30Ni5Al10 bulk metallic glass was investigated. With increasing load, the average friction coefficient descends, while the grinding trace width increases. The grinding traces exhibit smooth linear furrows. The larger the load is, the more serious the wear extent exhibits. Under smaller loads, the wear mechanism inclines to a combined result of slight bite or bite welding and continuous wear. While with the increase of load, the wear mechanism changes gradually to the combined effects of continuous wear, occlusion or bite welding, adhesive wear and abrasive wear.
Authors: Andrey V. Chumaevsky, Dmitry V. Lychagin, Sergei Yu. Tarasov, Alexandr Melnikov
Abstract: Copper single crystals grown according to the Bridgman method and having their axes [] or [11 aligned with the normal load axis were processed by dry sliding. As shown, sliding-induced severe plastic deformation occurred in the subsurface of single crystals and caused formation of a lip by mechanism of texture formation. The SEM structure of this lip was found to be composed of fragments with their shapes dependent on the single crystal orientation with respect to normal load and friction force.
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