Modelling of mechanical systems with friction interfaces considering variable normal contact load and tangential micro/macro slip

Dongwu Li, Chao Xu

科研成果: 书/报告/会议事项章节会议稿件同行评审

2 引用 (Scopus)

摘要

Mechanical structures with frictionally constrained interfaces often involve complex contact kinematics induced by tangential and normal relative motions. The tangential motion induces stick-micro/macro slip friction and causes energy dissipation. The normal motion induces normal load variation and possible separation of the joint interfaces. For effective analysis of dynamics of jointed structures, a reduced friction contact model is needed to characterize the nonlinear, coupled normal and tangential contact behaviors precisely. However, most developed microslip friction contact models considers only constant normal load. In this paper, an improved microslip friction model with normal load variation induced by normal motion is proposed. The tangential stick-micro/macro slip friction is modeled by continuous Iwan hysteretic model. This model is characterized by a slippage uniform distribution density function and a linear stiffness at stick state. The coupling relationship between tangential nonlinear restoring force and normal load variation is built. This leads to generalization of the original Iwan hysteretic friction model to consider the effect of variable normal load. The proposed model is applied to model a 7-dofs frictional damping experimental system. The results show that normal load variation and tangential microslip motion exert an important effect on prediction of friction contact behaviors. The proposed model is capable of generating asymmetric hysteresis loops and intermittent normal separation. The numerical simulation fit well with the experimental results for the 7-dofs frictional damping system, which validates the effectiveness and accuracy of the proposed model.

源语言英语
主期刊名ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
出版商American Society of Mechanical Engineers (ASME)
ISBN(电子版)9780791850558
DOI
出版状态已出版 - 2016
活动ASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016 - Phoenix, 美国
期限: 11 11月 201617 11月 2016

出版系列

姓名ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
4B

会议

会议ASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016
国家/地区美国
Phoenix
时期11/11/1617/11/16

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