A statistical model of elasto-plastic asperity contact between rough surfaces
A statistical model of elasto-plastic asperity contact between rough surfaces
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DOI：
10.1016/j.triboint.2005.09.001
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发表时间：
2006-09-01
影响因子：
6.2
通讯作者：
Green, Itzhak
中科院分区：
文献类型：
--
作者：
Jackson, Robert L.;Green, Itzhak
这项工作利用先前弹塑性球体与刚性平板接触的有限元分析结果，对两个粗糙表面之间的统计弹塑性接触进行了模拟。使用的单个粗糙接触模型考虑了最近在以前的工作中记录的不同的几何硬度效应(其中几何硬度定义为在完全塑性接触期间发现的均匀压力)。模拟了具有已知材料的真实表面与表面特性之间的接触，如弹性模数、屈服强度和粗糙度。将粗糙表面模拟为理想弹塑性材料。该模型预测了接触面积、接触力和表面分离。将该模型的计算结果与现有的其它粗糙接触模型进行了比较。协议在某些情况下存在，而在其他情况下，它可以纠正缺陷，特别是在较大变形时。由Chang、Etsion和Bogy开发的模型也被证明与其他模型相比存在严重缺陷。这项工作还确定了统计模型(包括格林伍德和威廉姆森的模型)的重大局限性。(C)2005爱思唯尔有限公司。保留所有权利。
This work models statistically clasto-plastic contact between two rough surfaces using the results of a previous finite element analysis of an elasto-plastic sphere in contact with a rigid flat. The individual asperity contact model used accounts for a varying geometrical hardness effect that has recently been documented in previous works (where geometrical hardness is defined as the uniform pressure found during fully plastic contact). The contact between real surfaces with known material and surface properties, such as the elastic modulus, yield strength, and roughness are modeled. The asperity is modeled as an elastic-perfectly plastic material. The model produces predictions for contact area, contact force, and surface separation. The results of this model are compared to other existing models of asperity contact. Agreement exists in some cases and in other cases it corrects flaws, especially at large deformations. The model developed by Chang, Etsion and Bogy is also shown to have serious flaws when compared to the others. This work also identifies significant limitations of the statistical models (including that of Greenwood and Williamson). (c) 2005 Elsevier Ltd. All rights reserved.