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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >RESOLVING THE CONTRADICTION OF ASPERITIES PLASTIC TO ELASTIC MODE TRANSITION IN CURRENT CONTACT MODELS OF FRACTAL ROUGH SURFACES
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RESOLVING THE CONTRADICTION OF ASPERITIES PLASTIC TO ELASTIC MODE TRANSITION IN CURRENT CONTACT MODELS OF FRACTAL ROUGH SURFACES

机译：解决分形粗糙表面当前接触模型中塑性到弹性模式转变的矛盾

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摘要

The elastic-plastic contact model of fractal rough surfaces offered by Majumdar and Bushan in 1991 (the MB model) is revisited. According to the MB model, the contact mode of a single fractal asperity transfers from plastic to elastic when the load is increased, and the asperity's contact area grows and becomes larger than a critical area, which is scale independent. This surprising result of the MB model is in contrast with classical contact mechanics where an increase of contact area due to increased load, is associated with a transition from elastic to plastic contact. The present study describes a revised elastic-plastic contact model of a single fractal asperity showing that the critical area is scale dependent, contrary to the MB model prediction. The new model also shows that a fractal asperity behaves as would be expected from classical contact mechanics namely, as the load and contact area increase a transition from elastic to plastic contact takes place in this order.
机译：回顾了Majumdar和Bushan在1991年提出的分形粗糙表面的弹塑性接触模型（MB模型）。根据MB模型，当载荷增加时，单个分形粗糙表面的接触模式就会从塑料转变为弹性，并且粗糙表面的接触面积会增大并变得大于临界范围，而临界面积与尺寸无关。 MB模型的这一令人惊讶的结果与经典的接触力学相反，在经典的接触力学中，由于载荷增加而导致的接触面积增加与从弹性接触到塑性接触的转变有关。本研究描述了单个分形粗糙的修正的弹塑性接触模型，显示了与MB模型预测相反的临界面积与尺度有关。新模型还表明，分形粗糙体的行为符合经典接触力学的预期，即，随着载荷和接触面积的增加，从弹性接触到塑性接触的过渡顺序随之发生。

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