Fracture of high temperature advanced materials.

基于细观（固体物理）与宏观（连续介质力学）非线性耦合的概念和强度对比研究的思想，对高温蠕变断裂判据进行了新的研究。（1）建立了预测高温韧脆材料（如高温合金、陶瓷等）高温蠕变裂纹萌生、扩展和断裂寿命的新判据。这使得能够根据材料参数（例如延展性）来区分行为。它包括Monkman-Grant公式作为特殊情况。（2）建立了从光滑试件到缺口和裂纹试件统一的主曲线预测高温蠕变寿命的简易评价方法。这种方法称为alpha参数法。

Based on nonlinearily coupled microscopic (solid state physical) and macroscopic (continuum mechanical) concept and the idea of comparative studies for strength, new results have been obstained on the criterion for high temperature creep fracture. The main results among them are as follows :(1)Development of new criterion for predicting high temperature creep crack initiation, growth and fracture life from high temperature ductile to high temperature brittle materials such as superalloys, and ceramics with chemical bonding of different types. This enables to discriminate the behavior in terms of materials parameters, such as ductility. It includes Monkman-Grant formula as a special case.(2)The establishment of simple evaluation method for predicting high temperature creep life by master curve unifiedly from smooth specimen throughout to notched and cracked specimen. This method is named as alpha parameter method.