Development of Pressure Vessel-type Proof Testing System for Ceramics.

摘要

Strength degradation was observed during proof testing in ceramic materials due to slow crack growth (S.C.G.). An experimental setup, a pressure vessel-type proof testing system, was developed in order to investigate this strength degradation. After proof testing, specimens for four-point bending tests were cut from the so-called strength-guaranteed area within which equivalent stress is higher than 90 percent of the maximum one. Fracture stress was measured at room temperature for failure probability based on G-criterion. Good agreement between experimental and theoretical data was achieved.