A finite element based elastic-plastic model for the contact of rough surfaces
A finite element based elastic-plastic model for the contact of rough surfaces
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DOI：
10.1080/10402000308982641
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发表时间：
2003-07-01
影响因子：
2.1
通讯作者：
Etsion, I
中科院分区：
文献类型：
--
作者：
Kogut, L;Etsion, I
提出了一种基于弹塑性单粗糙面接触精确有限元分析的粗糙面接触弹塑性模型。塑性指数W是影响粗糙表面接触的主要无量纲参数。低于Psi = 0.6的接触问题是纯弹性的，高于Psi = 8的接触问题主要是塑性的。发现平均实际接触压力实际上与接触负荷无关，类似于全塑性接触中的材料硬度。因此，可以使用0.4(1/Psi) H形式的“弹塑性硬度”来表示接触载荷和实际接触面积。与近似CEB （Chang, Etsion, Bogy）模型的比较表明，塑性指标值低于0.6的纯弹性接触结果相同，但塑性指标值高于1的弹塑性接触结果存在显著差异。
An elastic-plastic model for contacting rough surfaces that is based on accurate Finite Element Analysis (FEA) of an elastic-plastic single asperity contact is presented. The plasticity index W is shown to be the main dimensionless parameter that affects the contact of rough surfaces. Below Psi = 0.6 the contact problem is purely elastic and above Psi = 8 it is mostly plastic. The mean real contact pressure is found to be practically independent of the contact load, similarly to the material hardness in fully plastic contact. An "elastic-plastic hardness" in the form 0.4(1/Psi) H can therefore be used to relate the contact load and real area of contact. A comparison with the approximate CEB (Chang, Etsion, Bogy) model shows identical results for pure elastic contacts having plasticity index values below 0.6 but substantial differences for elastic-plastic contacts having plasticity index values above 1.