传热界面真实接触面积计算与分析

在热流通过两相互接触材料尤其是金属材料的界面时，真实接触面积是界面传热的一个主要影响因素。当承受大应力的两接触体之间具有相对滑动或相对滑动趋势时，粗糙表面在压力和粘着力及剪切力的作用下接触粗糙峰发生弹性、弹一塑性或完全塑性变形，真实接触面积与压力之间的关系随变形机制而发生变化，在力的作用下材料的变形机制由表面微观几何形貌和力学性质决定。计算表明，单个粗糙峰接触面积与载荷的关系受变形机制的影响，粘着力对接触面积的影响可以忽略，表面相对滑动将增加真实接触面积。

Calculation and Analysis of the Real Contact Area of Heat Transfer Interface

The real contact area is the main factor effecting the heat transfer when the heat is crossing the interface between two contacted materials ,especially the metal materials. When two contacted bodies under large strain possess relatively slide or sliding trend,the contacting asperities occur elastic,elasto-plastic or fully plastic deformation. The relation between the real contact area and the pressure vary with the deformation mechanism, which is determined by the microgeometry and the mechanical characteristics. The calculating results show that the relation between the contact area and the load of single asperity is effected by the deformation mechanism, and the effect of the adhesive force to the contact area is omitted, the sliding between the faces increases the real contact area.