软材料接触力学问题的实验研究

针对硫化硅橡胶在刚性压头作用下的大变形接触问题,研究了橡胶类软材料接触区区域变形场的实验测量技术。为了研究硫化硅橡胶与刚性体在试件内部接触的大变形问题,本文提出了一种体内数字栅云纹实验技术,给出了该技术的原理和实现方法。然后运用数字图像处理方法得到了橡胶材料大变形位移u场、v场,并结合橡胶材料在压头作用下的理论分区模型,分析了软材料接触区域的大变形场,讨论了接触区域的变形分区规律,并初步给出了接触区域应变计算方法。

Experimental Analysis of Mechanics Problem within Soft Material Contact Field in Large Deformation

An experimental measurement technique was developed and presented in this paper for solving the mechanics problem emerged in the contact field formed by a rigid indenter and rubber-like soft material with large deformation. The soft material being studied is a kind of vulcanized silicone rubber, and the in-plane deformation of a large deformation field is measured by digital moiré method. As the specimen is in large deformation and the contact with wedge-shape indenter occurs in the specimen, an inner-grating technology is presented, and its principle and implementation method is introduced in the paper. The vertical and horizontal displacement field was obtained by digital image processing method. Then, deformation characteristics and experimental sector division properties in the vicinity of contact edge were analyzed according to the results of in-plane deformation. Further, the strain distribution near the contact area can be provided by a grid deformation method, based on large deformation theory. The data were directly obtained from experimental results, so it's intuitive and reliable.