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浙江大学学报(工学版)
浙江大学学报(工学版)
能源工程     
基于热弹塑性理论的法向接触刚度分形模型
冯燕1,2, 俞小莉1, 刘震涛1
1. 浙江大学 动力机械及车辆工程研究所,浙江 杭州 310027; 2. 浙江同济科技职业学院 机电系,浙江 杭州 311231
Fractal model of normal contact stiffness based on thermal elasto-plastic theory
FENG Yan1,2, YU Xiao-li1, LIU Zhen-tao1
1. Power Machinery & Vehicular Engineering Institute, Zhejiang University, Hangzhou 310027, China; 2. Department of Mechanical and Electrical Engineering, Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311231, China
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摘要：

针对现有法向接触刚度分形模型没有考虑热应力影响、不适用于分析结合部温度变化的问题,基于各向异性分形几何理论的法向接触力学模型,引入表征粗糙表面热力学特性的热弹塑性接触理论,建立了粗糙表面热弹塑性接触法向刚度模型.该模型是传统法向接触刚度分形模型在基础理论和应用范围的拓展,可用于计算和分析工程实际中大量存在的结合部温度发生改变的接触情况.通过数字仿真,分析了典型参数对结合部热弹塑性接触法向刚度的影响规律.结果表明：热弹塑性接触法向刚度随线膨胀系数、比例系数、温差、分形维数的增大而增大,随表面粗糙度的增大而减小.
Abstract:

Without considering the influence of thermal stress, the existing fractal models of normal contact stiffness are not applicable to analyze the contact issues when the temperature changes. Based on normal contact mechanics model adopting anisotropic fractal geometrical theory, thermal elasto-plastic contact theory that characterize thermodynamic properties of rough surface was introduced, then the fractal model of thermal elasto-plastic contact of rough surfaces was established in order to analyze the real contact conditions between fixed contact surfaces when the temperature changes. This model expands basic theory and applications of traditional models. The effects of main parameters on the normal contact stiffness of thermal elasto-plastic contact of joint interface was analyzed through digital simulation. The results make clear that the normal contact stiffness of thermal elasto-plastic contact increases with the coefficient of linear expansion, scale factor, temperature difference, fractal dimension, and decreases with fractal roughness.
出版日期: 2015-08-01
:  TH 123  
基金资助:

国家“863”高技术研究发展计划资助项目(2012AA111709)
通讯作者: 刘震涛,男,副教授     E-mail: liuzt@zju.edu.cn
作者简介: 冯燕(1985—),女,讲师,从事耐久可靠性设计理论与试验方法研究.E-mail: fengyan111e@126.com
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引用本文:

冯燕, 俞小莉, 刘震涛. 基于热弹塑性理论的法向接触刚度分形模型[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.08.021.

FENG Yan, YU Xiao-li, LIU Zhen-tao. Fractal model of normal contact stiffness based on thermal elasto-plastic theory. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.08.021.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2015.08.021    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I8/1553

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