An asperity microcontact model incorporating the transition from elastic deformation to fully plastic flow
An asperity microcontact model incorporating the transition from elastic deformation to fully plastic flow
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DOI：
10.1115/1.555332
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发表时间：
2000-01-01
影响因子：
2.5
通讯作者：
Chang, L
中科院分区：
文献类型：
--
作者：
Zhao, YW;Maietta, DM;Chang, L
本文提出了一种用于两个名义上平坦表面之间接触的弹塑性微凸体微接触模型。基于接触力学理论，结合不同变形模式下变量的连续性和光滑性，对接触微凸体从弹性变形到完全塑性流动的过渡进行建模。在弹塑性变形阶段，微凸体的平均接触压力和接触面积与其接触干涉的关系分别用对数和四次多项式函数表示。然后使用这些粗糙尺度方程来建立两个粗糙表面之间的弹塑性接触模型，允许将人表面分离和真实的接触面积计算为接触载荷和表面塑性指数的函数。结果提出了一个广泛的接触载荷和塑性指数，精确建模的凹凸接触的弹塑性过渡制度的变形的重要性。与GW模型和CEB模型的计算结果进行了比较，表明本模型在描述粗糙表面的接触方面更为完整。
This paper presents an elastic-plastic asperity microcontact model for contact between two nominally flat surfaces. the transition from elastic deformation to fully plastic flow of the contacting asperity is modeled based on contact-mechanics theories in conjunction with the continuity and smoothness of variables across different modes of deformation. The relations of the mean contact pressure and contact area of the asperity to its contact interference in the elastoplastic regime of deformation are respectively modeled by logarithmic and fourth-order polynomial functions. These asperity-scale equations are then used to develop the elastic-plastic contact model between two rough surfaces, allowing the man surface separation and the real area of contact to be calculated as functions of the contact load and surface plasticity index. Results are presented for a wide range of contact load and plasticity index, showing the importance of accurately modeling the deformation in the elastoplastic transitional regime of the asperity contacts. The results are also compared with those calculated by the GW and CEB models, showing that the present model is more complete in describing the contact of rough surfaces.