A Comprehensive Elastic-Plastic Single-Asperity Contact Model
A Comprehensive Elastic-Plastic Single-Asperity Contact Model
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DOI：
10.1080/10402004.2013.877179
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发表时间：
2014-01
影响因子：
2.1
通讯作者：
A. Megalingam;M. Mayuram
中科院分区：
文献类型：
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作者：
A. Megalingam;M. Mayuram
一般来说，粗糙表面的接触是通过统计方法建模和分析，包括微几何测量和描述的接触（形状，尺寸，间距和粗糙度的高度），开发理论表达式来描述接触的粗糙度的力学行为，并最终将其扩展到整个表面接触。在Kogut-Etsion模型（KE模型）、Jackson-Green模型（JG模型）和Shankar-Mayuram模型（SM模型）等主要接触模型中，利用有限元概念对轴对称半球形微凸体与刚性平面的接触进行建模和分析，并将所得的接触参数关系推广到粗糙表面接触。本工作解决了完整的泊松比的效果和它的影响，在子表面屈服，弹塑性过渡和开始完全塑性接触会计现实的材料行为，这是不包括上述模型。提出了一个统一的单微凸体模型，并在此基础上，经验关系开发预测的接触参数（无量纲接触载荷和接触面积），然后扩展到统计粗糙表面接触。
Generally, the contact of rough surfaces is modeled and analyzed through statistical approaches, including microgeometrical measurements and description of the asperities in contact (shape, size, spacing, and asperity height), developing theoretical expressions to describe the mechanical behavior of the asperities in contact, and finally extending it to the whole surface contacts. In some of the main contact models like the Kogut-Etsion model (KE model), Jackson-Green model (JG model), and Shankar-Mayuram model (SM model), an axisymmetrical hemispherical asperity in contact with a rigid flat surface is modeled and analyzed using finite element concepts and the resultant contact parameter relations are extended to rough surface contacts. The present work addresses the complete effect of Poisson's ratio and its influence in sub surface yielding, elastic-plastic transition and inception of fully plastic contact by accounting realistic material behavior which are not covered by the above models. A unified single-asperity model is proposed and, based on the results, empirical relations are developed to predict the contact parameters (dimensionless contact load and contact area), which are then extended to statistical rough surface contacts.