Unified Time-Dependent Fracture Model Based on the Thermally Activated Process and Fracture Strength Properties of Porous Ceramics
Shinya MATSUDA
Abstract:This paper presents a time-dependent fracture model for strength properties estimation of porous ceramics under various load modes. Unified time-dependent fracture model for reliability analysis of strength properties was established on the basis of thermally activated process concept in conjunction with two-parameter Weibull distribution. Fracture strength data obtained under various load modes tests using specimen having different shape or size, can be estimated commonly the aid of the model if the fracture mechanism is all same under various load modes. The model was applied to strength data of porous ceramics obtained from quasi-static bending test and cycle fatigue test. All the data could be estimated commonly. Key Words:Porous ceramics, Thermally activated process, Time-dependent fracture, Equivalent time, Effective volume