结构陶瓷材料断裂强度统计预测模型

根据最弱环理论,应用Weibull和Batdorf两种断裂强度统计预测模型,对结构陶瓷含体内裂纹情况下的断裂强度进行了统计分析和预测。通过应用三点弯曲试验得到的模型参数,计算了高速旋转下圆盘断裂强度的分布概率,并对两种预测模型的预测结果与试验结果进行了分析比较。

STATISTICAL FA RE PREDICTION MODELS FOR ST UCTURAL CERAMICS

The Weibull/PIA(Principle of Indepent Action) and Batdorf models are ap-plled to statistical analysis of fracture strength of structural ceramic components with crack in body under multiaxial stresses. As an example, the probability of failure distributions for H. P. Silicion Nitride disk fracture strength under high speed rotation has been estimated numerically with a finite element method on the basis of the model parameters obtained r'rom 3-point bending experiments of H. P. Silicion Nitride, and compared with experimental data available from literature. The results indicate the considerable superiority of the Batdorf model over the Weibull/PIA model in accuracy and confirm the non-conservative nature of the latter.