In-situ Evaluation of Strength Properties and Residual Stresses of Brittle Materials with Spherical Indentation
球压法在线评价脆性材料的强度特性和残余应力

The contact stress and the critical stress distribution were analyzed, and some paradoxes related to contact crack initiation were explained through the effect of stress gradient. Based on the Mean-Strength criterion, a testing method for determining the local strength and residual stress in brittle materials was developed. And also a simple technique of proof test was created, that is useful for non-destructive evaluation of the strength for brittle components.