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Effects of friction heat on the Tribological Properties of the Woven Self-lubricating Liner

Chinese Journal of Mechanical Engineering 2009年第6期22卷 918-924页

作者： YANG Yulin ZU Dalei ZHANG Ruijun QI Xiaowen Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science and Technology. Yanskan Universiry Qinhuangdao 066004 China

In the dry-sliding process of the woven self-lubricating liner which is used in the self-lubricating spherical plain bearing, the friction heat plays an important role in the tribological performances of the liner. It has important value to study on the relationship between tribological performances of the liner and the friction heat. Unforttmately, up to now, published work on this relationship is quite scarce. Therefore, the effect of friction heat on the tribological performances of the liner was investigated in the present work. The tribological behaviors of the liner were evaluated by using the high temperature end surface wear tester. Scanning electron microscopy （SEM） was utilized to examine the morphologies of worn surfaces of the liner and study the failure modes. Differential scanning calorimetry （DSC） measurement and X-ray diffraction （XRD） analysis were performed to study the behaviors of the wear debris. The temperature rise on the worn surface was calculated according to classical models. SEM observation shows that the dominating wear mechanism for the liner is mainly affected by friction shear force, contact pressure and friction heat. Higher fusion heat for the wear debris than that for the pure polytetrafluroethylene （PTFE） indicates that the PTFE is the main portion of the wear debris, and, the PTFE in the wear debris shows a higher crystallisation degree owing to the effects of friction shear force and the friction heat. Combining the calculated temperature rise results with the wear rate of the liner, it can be concluded that the effects of temperature rise o n the tribological performances of the liner become more obvious when the temperature rise exceeds the glass transition temperature （Tg） of the PTFE. The wear resistance of the liner deteriorates dramatically when the temperature rise approaches to the melting point （Ton） of the PTFE. The tribological performances of the liner can be improved when the temperature rise exceeds Tg but is far l

关键词： woven fabric self-lubricating liner friction and wear friction heat differential scanning calorimetry thermal analysis transfer film

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Tribological behaviors of turbofan seal couples from friction heat perspective under high-speed rubbing condition

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friction 2016年第2期4卷 176-190页

作者： Siyang GAO Weihai XUE Deli DUAN Shu LI Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The tribological behaviors of two types of seal coatings, nickel-graphite and aluminum-hexagon-boron nitride (Ni-Cg and Al-hBN, respectively) versus a Ti-6Al-4V blade used in turbofan engines were investigated using a high-speed rubbing test. The wear status and damage mechanism of the friction couples were studied and the abradability of the seal coatings was evaluated. By analysis of the coating properties and damage mechanism of the seal couple, the friction heat effect was identified as the key factor influencing blade wear forms as well as coating abradability. A one-dimensional heat conduction model was established to estimate the effect of increasing temperature on the friction interface. The results indicated that in the Ni-Cg and Ti-6Al-4V seal couple, the temperature rising rate (TRR) of the Ti-6Al-4V blade was faster than that of the Ni-Cg coating, and so the Ti-6Al-4V blade softened earlier than the Ni-Cg coating, causing the blade to suffer severe wear. In the Al-hBN and Ti-6Al-4V seal couple, the TRR of the Ti-6Al-4V blade was slower than that of the Al-hBN coating, and so the Al-hBN coating softened first; thus, blade damage was reduced or even replaced by coating adhesion. The square root ratio of thermal diffusivity between the blade and the coating could be taken as an indicator of the ratio of TRR between the blade and coating to predict blade wear status as well as damage mechanism. The results of the model agreed well with the experiment results of the two seal couples used in this study.

关键词： seal coating high-speed rubbing wear mechanism friction heat thermophysical property

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Vibration-Induced friction Temperature Field Analysis Under Different Working Condition of Heavy Load Bolt

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Journal of Iron and Steel Research International 2011年第S1期18卷 641-645页

作者： LIANG Feng-rui,SU Hang,YANG Cai-fu (Institute for Structural Materials,Central Iron and Steel Research Institute,Beijing 100081,China) Cent Iron & Steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China

Based on thermal-stress coupling analysis and material properties studies,the vibration-induced friction process of a special used heavy-load bolt has been *** temperature distribution of the bolt has been calculate with heat radiation and heat convection *** a solid lubricant,polytetrafluoroethylene (PTFE) has bee considered to reduce the friction heat *** result shows that,there are very strong heat effect while no lubracant considered,the temperature of the bolt joint increased sharply and up to 700℃,which exceed the allowable temperature range of the *** PTFE lubricant has been applied,the temperature of the bolt joint increased to 260 ℃,and the bolt steel can by applied in this *** results provide important guidance for the bolt structure modification and material selection.

关键词： friction heat temperature field materials phase transition solid lubrication thermal-stress coupling analysis

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Theoretical Explanation of Uneven Transverse Temperature Distribution in Wide Thin Strip Rolling Process

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Journal of Iron and Steel Research International 2010年第4期17卷 18-23页

作者： TIAN Li-li Paolo Patrizi ZHANG Jie Fabio Miani University of Science and Technology Beijing Beijing 100083 China University of Udine Udine 33100 Italy

A new theoretical thermomechanical explanation of the uneven transverse temperature distribution, along the width for thin and wide hot rolled strip was proposed. In particular, starting from the irregular pressure and friction distribution which led to an uneven heat generation, a 2D mathematical model of calculating the transverse termperature distribution was presented. A physical explanation for this problem was given and the model was used as an essential basis to build a corresponding FEM simulation model, in which heat loss and generation were considered. Deformation and friction heat were described in details. For a clearer and more logical analysis, the heat generation problem was split into two parts： one for the strip centre, and one for the sides, in correspondence with the temperature peak points at 100 mm from the strip edge. Finally, the result shows that how thenew theoretical model can lead to the exact interpretation of the measured uneven temperature distribution.

关键词： hot strip rolling strip temperature distribution strip thermomechanical behaviour deformation heat friction heat

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Dynamic engagement characteristics of wet clutch based on hydro-mechanical continuously variable transmission

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Journal of Central South University 2021年第5期28卷 1377-1389页

作者： ZHAO Jing XIAO Mao-hua Petr BARTOS Andrea BOHATA College of Engineering Nanjing Agricultural UniversityNanjing 210031China Faculty of Agriculture University of South BohemiaStudentska 1668Czech

The effect of the design parameter on the clutch engagement process of the hydro-mechanical continuously variable transmission(CVT)was ***,the model of the power train was developed with the software of SimulationX,and the clutch shift experiment was used to validate the correctness of the ***,the friction coefficient function was fitted with the test data to get the friction coefficient model suitable for this ***,based on the evaluating index of the friction torque and the friction power,two groups of design parameters(oil pressure and friction coefficient)were simulated and explained the changing regulation *** to the simulation results,the high oil pressure and friction coefficient can reduce the slipping *** large oil pressure can increase the peak torque but the effect of friction coefficient on the peak torque is not so *** friction power reaches the maximum value at 3.2 s,the peak value increases as the oil pressure and friction coefficient *** effect of the oil pressure on the clutch engagement and thermal performance is greater than the friction coefficient.

关键词： wet clutch friction heat friction torque friction power

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