Mechanisms and Mechanics of Quasi-Static Brittle Fracture

该奖项旨在支持对两种多晶高强合金中由应力辅助表面吸收氧扩散引起的准静态脆性断裂现象的机理理解的实验和分析研究，并探索抑制脆化的方法。非线性裂纹尖端区域的蠕变和扩散耦合模型将用于预测载荷、环境和材料性能对起裂和裂纹扩展的依赖。预测的裂纹扩展速率将与测量的速率进行比较，以便对模型进行评估。＊＊＊

9403980 McMahon This award is made to support experimental and analytical research in the mechanistic understanding of the phenomena of quasi-static brittle fracture caused by stress assisted diffusion of surface- absorbed oxygen into two polycrystalline high-strength alloys and to explore methods to inhibit the embrittlement. A model with coupled creep and diffusion in the nonlinear crack-tip region will be used to predict the dependence of initiation and crack growth on loading, environment, and material properties. Predicted crack growth-rates will be compared with measured rates in order to evaluate the model. ***