Abstract
A test technique for loading the arbitrary stress and a method for strength evaluation were studied to develop a reliability testing method. (1) The test technique for loading arbitrary stress was developed by using thermal stress. (2) The thermal stress reached a maximum immediatly after cooling, and then decreased monotonically. (3) The maximum thermal stress increased with an increase of both temperature and thickness of specimen. (4) The strength of brittle materials was evaluated by using a relationship between temperature and the maximum stress.
