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Finite element analysis and experimental validation of polymer-metal contacts in block-on-ring configuration

Friction 2024年第3期12卷 554-568页

作者： K.Y.Eayal AWWAD Khosro FALLAHNEZHAD B.F.YOUSIF Ahmad MOSTAFA Omar ALAJARMEH A.SHALWAN Xuesen ZENG Mechanical Engineering Department Faculty of EngineeringTafila Technical UniversityTafila 66110Jordan Medical Device Research Institute College of Science and EngineeringFlinders UniversitySouth Australia 5042Australia Centre for Future Materials University of Southern QueenslandToowoomba 4350Australia Department of Manufacturing Engineering Technology Public Authority for Applied Education and TrainingKuwait 13092Kuwait

The wear profile analysis,obtained by different tribometers,is essential to characterise the wear ***,most of the available methods did not take the stress distribution over the wear profile in consideration,which causes inaccurate *** this study,the wear profile of polymer–metal contact,obtained by block-on-ring configuration under dry sliding conditions,was analysed using finite element modelling(FEM)and experimental ***’s wear equation was integrated into a developed FORTRAN-UMESHMOTION code linked with Abaqus software.A varying wear coefficient(k)values covering both running-in and steady state regions,and a range of applied loads involving both mild and severe wear regions were measured and implemented in the *** FEM was in good agreement with the *** model reproduced the stress distribution profiles under variable testing conditions,while their values were affected by the sliding direction and maximum wear depth(hmax).The largest area of the wear profile,exposed to the average contact stresses,is defined as the normal *** the critical zones were characterized by high stress concentrations reaching up to 10 times of that at the normal *** wear profile was mapped to identify the critical zone where the stress concentration is the key point in this *** surface features were examined in different regions using scanning electron microscope(SEM).Ultimately,SEM analysis showed severer damage features in the critical zone than that in the normal zone as proven by ***,the literature data presented and considered the wear features the same at any point of the wear *** this study,the normal zone was determined at a stress value of about 0.5 MPa,whereas the critical zone was at about 5.5 *** wear behaviour of these two zones showed totally different features from one another.

关键词： polymer-to-metal contact block-on-ring wear profile wear model

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Research and experimental analysis of precision degradation method based on the ball screw mechanism

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High Technology Letters 2023年第3期29卷 247-256页

作者：孔德顺 GAO Xiangsheng JIANG Huizeng Institute of Standard Metrology China Academy of Railway Sciences Corporation LimitedBeijing 100081P.R.China Beijing Huaheng Technology Co.Ltd. Beijing 100081P.R.China Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing 100124P.R.China Hebei Changxiang Rubber Plastic Technology Co.Ltd. Hengshui 053500P.R.China

As a key transmission component in computer numerical control(CNC) machine tools,the ball screw mechanism(BSM) is usually investigated under working load conditions. Its accuracy degradation process is relatively long,which is not conducive to the design and development of new products. In this paper,the normal wear depth of the BSM nut raceway is calculated under the variable speed operation condition using the fractal wear analysis method and the BSM’s accelerated degradation proportional wear model. Parameters of the acceleration degradation model of the double-nut preloaded ball screw pair are calculated based on the physical simulation results. The accelerated degradation test platform of the BSM is designed and manufactured to calculate the raceway wear model when the lubrication condition is broken under the variable-speed inertial load and the boundary lubrication condition under the uniform speed state. Three load forces and two samples are selected for the accelerated degradation test of the BSM. The measured friction torque of the BSM is employed as the evaluation index of the accuracy degradation test. In addition,the life cycle of the accuracy retention is accurately calculated by employing the parameters of the physical simulation model of the BSM. The calculations mentioned above can be used to estimate BSM’s accuracy performance degradation law under normal operating conditions. The application of the proposed model provides a new research method for researching the precision retention of the BSM.

关键词： ball screw mechanism(BSM) fractal theory wear model accelerated degradation method friction torque precision retention

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Evaluation and prediction of the effect of load frequency on the wear properties of pre-cracked nylon 66

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Friction 2014年第3期2卷 240-254页

作者： A.ABDELBARY M.N.ABOUELWAFA I.M.EL FAHHAM Mechanical Engineering Department Faculty of EngineeringAlexandria UniversityAlexandriaEgypt

Nylon 66 has been widely used for numerous mechanical applications but its sliding wear mechanisms are not fully *** particular,limited attention has been paid to the generation of fatigue surface cracks under constant and cyclic load *** present work focuses on the effect of load frequency on the wear behavior of a polymer with surface defects in dry sliding *** defects were imposed vertical deep cracks perpendicular to the direction of *** studies were conducted against a steel counterface at constant loads,and in cyclic loads at different *** neural network(ANN)models were examined to identify one that optimally simulates wear under the applied load *** cracks were found to have a remarkable adverse effect on the wear behavior of the *** wear rates were influenced by the number of cracks as well as the type of applied ***,results suggest that the presence of surface cracks is attributable to the section B wear ***,acceptable predicted wear rate values were obtained by introducing the ANN wear model.

关键词： nylon wear surface defects wear model

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wear RESISTANCE OF Ni-Ti ALLOY

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Acta Metallurgica Sinica(English Letters) 1988年 76-81页

作者： JIN Jialing WANG Hongliang Shanghai Iron and Steel Research Institute,Shanghai,China Engineer,Shanghai Institute of Iron and Steel Research,Wusong,Shanghai,China

An elastic—plastic wear model for metal abrasion has been built up based on comparingthe dry abrasion behavior and high temperature hardness of Ni-Ti,Co45 and38CrMoA1A alloys and studying the microstructure and the deformation character ofNi-Ti *** was used to interprete the nature of wear resistance of Ni-Ti alloywhich possesses low hardness and high elastisity.

关键词： Ni-Ti alloy wear resistance wear model microstructure

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