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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Some models of asperity contacts
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Some models of asperity contacts

机译：粗糙接触的一些模型

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A series of finite element models has been run where a rigid full cylinder and a rigid cut cylinder slide across a softer surface. In these simulations, three independent parameters are varied: (1) the elasticity of the deforming material, which can be quantified non-dimensionally by the elastic range, defined as the ratio of yield stress σ_y to the elastic modulus E, (2) the loading conditions, expressed by the non-dimensional parameter N/kR and (3) the interface conditions, expressed by the Tresca factor f, ratio of the shear strength of the interface τ) to the shear yield strength of the deforming material k. It is shown that elastic effects modify significantly the slipline field solution to the sliding cylinder in terms of friction. When friction is assumed at the interface (i.e. f > 0), friction coefficients predicted by the FEA models are higher than slipline field theory at low loads and lower at high loads. There is a load range when friction coefficients calculated do not depend much on the load. It is also shown that friction falls with the elastic range (σ_y/E) for the highest loads and rises with (σ_y/E) when the load approaches zero. Further work is needed to develop a relationship between friction and plastic strains predicted by slipline field theory and those predicted by finite element analysis.
机译：运行了一系列有限元模型，其中刚性的完整圆柱体和刚性的切割圆柱体在较软的表面上滑动。在这些模拟中，改变了三个独立的参数：（1）变形材料的弹性，可以通过弹性范围进行无量纲的量化，弹性范围定义为屈服应力σ_y与弹性模量E的比，（2）载荷条件，用无量纲参数N / kR表示；（3）界面条件，用Tresca因子f，界面抗剪强度τ）与变形材料k的剪切屈服强度之比表示。结果表明，在摩擦方面，弹性效应显着地改变了滑移线的滑移场解。当在界面处假设摩擦时（即f> 0），由FEA模型预测的摩擦系数在低载荷下高于滑移线理论，在高载荷下更低。当计算的摩擦系数与负载的关系不大时，存在一个负载范围。还显示出，对于最高载荷，摩擦力随弹性范围（σ_y/ E）下降，而当载荷接近零时，摩擦力随（σ_y/ E）增大。需要做进一步的工作来发展滑移场理论所预测的摩擦和塑性应变与有限元分析所预测的之间的关系。

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