论文标题
测量实际接触面积的粗糙金属表面以及与弹性和可塑性的贡献的区别
Measurement of real contact area for rough metal surfaces and the distinction of contribution from elasticity and plasticity
论文作者
论文摘要
粗糙表面之间的真实接触面积的测量是接触力学中最挑战的问题之一，并且重要的是了解摩擦学中的某些物理机制。基于沮丧的总内部反射，新的设备旨在测量真实的接触区域。对于具有各种表面地形的黄铜样品，测量了正常负载和实际接触区域之间的关系。我们的实验验证了加载过程中负载和实际接触区域之间的线性关系。更重要的是，首先考虑卸载过程以区分弹性和可塑性在粗糙表面接触中的贡献。发现在整个连续的加载过程中，弹性和可塑性都涉及，与当前的理解和假设不同的是在不同的负载阶段发挥作用。提出了定量参数，以表明可塑性的贡献。目前的工作不仅提供了一种测量真实接触区域的实验方法，而且还弄清楚弹性和塑性变形如何在粗糙表面接触中起作用。
The measurement of real contact area between rough surfaces is one of most challenge problems in contact mechanics and is of importance to understand some physical mechanisms in tribology. Based on the frustrated total internal reflection, a new apparatus is designed to measure the real contact area. For brass samples with various surface topographies, the relation between normal load and real contact area is measured. Our experiments verify the linear relationship between load and real contact area during loading process. More importantly, the unloading process is firstly considered to distinguish the contribution of elasticity and plasticity in contact of rough surfaces. It is found that both elasticity and plasticity are involved throughout the continuous loading process, different from some present understanding and assumptions that they play at different loading stages. A quantitative parameter is proposed to indicate the contribution of plasticity. The present work not only provides an experimental method to measure real contact area but figure out how elastic and plastic deformation works in contact of rough surfaces.
