Research on Continuous Smooth Exponential Model of Elastic-Plastic Contact and Normal Contact Stiffness of Rough Surface

doi:10.7652/xjtuxb201607010

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Research on Continuous Smooth Exponential Model of Elastic-Plastic Contact and Normal Contact Stiffness of Rough Surface

更新时间：2025-07-09

- Research on Continuous Smooth Exponential Model of Elastic-Plastic Contact and Normal Contact Stiffness of Rough Surface
- Vol. 50, Issue 7, Pages: 58-67(2016)
- 作者机构：
  
  太原科技大学机械工程学院,太原,030024
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201607010
  CLC： TH113.1
- Online First：10 July 2016，
  
  Published：2016
- 稿件说明：
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Research on Continuous Smooth Exponential Model of Elastic-Plastic Contact and Normal Contact Stiffness of Rough Surface[J]. 2016, 50(7): 58-67.
DOI：

Research on Continuous Smooth Exponential Model of Elastic-Plastic Contact and Normal Contact Stiffness of Rough Surface[J]. 2016, 50(7): 58-67. DOI： 10.7652/xjtuxb201607010.

摘要

针对微凸体在完全弹性、弹塑性和完全塑性变形阶段接触载荷和接触面积的不连续、跳跃和不光滑

以及平均接触压力的不单调问题

提出了一种新颖的近似指数形式的解析模型。在此基础上

利用分形理论进一步建立了粗糙表面在三阶段接触时的法向接触刚度和法向接触载荷与真实接触面积之间的解析模型

并进行了无量纲化处理。仿真分析了分形维数D、塑性指数Φ以及无量纲分形粗糙度参数G

对无量纲法向接触刚度K

和无量纲法向接触载荷F

的影响规律

并分析了K

随F

的变化规律。模型的仿真结果表明:K

和F

都随着无量纲真实接触面积A

的增大而增大; 随Φ的增大或G

的减小

和F

的增速都变大; F

的增速随D的变化是先减小后增大

而K

的增速是指数增大; K

随F

的增大而增大

在D从1.1到1.9的变化过程中

随F

的增速是先增大后减小

在D>1.51时

随着G

的减小

随F

的增速明显变大。利用法向接触刚度模型计算了哑铃模型的固有频率

计算结果与实验结果比较一致

验证了模型的准确性。

Abstract

A novel approximate exponential analytical model of asperity elastic-plastic contact is developed. The proposed model can solve the problem of discontinuous

leap and unsmooth contact load and contact area in thre

e separated phases

i.e. perfectly elastic phase

elastic-plastic phase and fully plastic phase

and can also deal with the problem of non-monotone of average contact pressure in the elastic-plastic phase. The analytical model between the contact stiffness or contact pressure of rough surface and the real contact area in the three phases is further established by the fractal theory. The dimensionless normal contact stiffnessK

and dimensionless normal contact loadF

are obtained. The influences of fractal dimensionD

plastic index Φ and dimensionless fractal roughness parameterG

onK

orF

are simulated and analyzed

and the change ofK

withF

is also simulated and analyzed. The results show thatK

andF

increase with increasing dimensionless real contact areaA

; the increasing rate ofK

andF

are enhanced with the increase of Φ or decrease ofG

. The increasing rate ofF

decreases first and then increases withD

while the increasing rate ofK

shows an exponential increase.K

increases withF

. WhenD changes from 1.1 to 1.9

the increasing rate ofK

increases first and then decreases withF

. WhenD>1.51

the value ofK

obviously increases with the decrease ofG

. The natural frequencies of the dumbbell model are calculated by the normal contact stiffness model and compared with the experimental one

verifying the accuracy of the proposed model.

关键词

Keywords

references

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Related Institution

Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University

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