Mechanisms and Mechanics of Quasi-Static Brittle Fracture

准静态脆性断裂的机理和机理

• 批准号: 9503980
• 负责人: Charles McMahon
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-06-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9503980&HistoricalAwards=false
• 关键词: Mechanisms; Mechanics; Quasi; Static; Brittle

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. ***

9403980 McMahon该奖项旨在支持实验和分析研究，以从机理上理解表面吸附氧在两种多晶高强度合金中的应力辅助扩散引起的准静态脆性断裂现象，并探索抑制脆化的方法。 耦合蠕变和扩散的非线性裂纹尖端区域的模型将被用来预测的依赖性的启动和裂纹扩展的负载，环境和材料性能。 将预测的裂纹扩展速率与实测速率进行比较，以评估模型。 ***