摘要
循环载荷对粗糙界面接触刚度、热阻以及电阻的影响机制是评估复杂工程结构界面性能需解决的关键问题.如何表征接触过程随机性,并揭示界面不同物理量耦合机制,从而预测界面性能(接触刚度、热阻和电阻)演化规律是极具挑战的问题.本文提出了一种随机接触过程概率表征方法,并基于此建立了界面力-热-电接触理论模型来描述循环载荷下粗糙界面接触行为,揭示了循环载荷对界面刚度、隔热能力和导电能力影响机制,为复杂工程结构界面性能评估和寿命预测提供了理论参考。
The influence mechanism of cyclic loading on the stiffness,thermal resistance,and electrical resistance of rough contact surfaces is a key issue in evaluating the interface contact performance of engineering structures under complex loading conditions.How to characterize this random contact process and reveal the correlation mechanism of different physical quantities at the contact interface,and to predict the changes of interface contact stiffness,thermal resistance and electrical resistance with cyclic load is a very critical and challenging problem.In this paper,a probabilistic characterization method for the random contact process is proposed.Then,based on this method,theoretical models are established to describe the mechanical behavior,thermal and electrical contact resistance of the rough contact surface under cyclic loading.The results show that the cyclic load has a significant effect on the thermal and electrical contact resistance.The stiffness,thermal insulation capacity,and electrical conductivity of the interface are closely related to the number of cyclic loads,which provides a reference for the evaluation of interface performance and life prediction of engineering structures in complex environments.
作者
赵行
他吴睿
周又和
Hang Zhao;Wurui Ta;Youhe Zhou(Institute of Superconductor Mechanics,Lanzhou University,Lanzhou 73000,China;Department of Mechanics and Engineering Science,College of Civil Engineering and Mechanics,Lanzhou University Lanzhou 730000,China;Key Laboratory of Mechanics on Environment and Disaster in Western China,The Ministry of Education of China,Lanzhou University,Lanzhou 730000,China)
基金
The authors are grateful to Prof.Yuanwen Gao and Prof.Xingyi Zhang for their help and enlightening discussions in experiments as well as financial support from the Natural Science Foundation of China(Grant No.12272157)
the National Key R&D Program of China(Grant No.2022YFC3003401)
State Key Laboratory Project of Geohazard Prevention and Environment Protection(Grant No.SKLGP2023K023)
the Young Scientific and Technological Talent Support Project of Gansu(Grant No.GXH20210611-03)
the Lanzhou Science and Technology Support Project(Grant No.2021-1-153)
the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2021-ct04)
the 111 Project(Grant No.B14044).
