摘要
在以滑移溶解理论为基础的裂纹扩展速率定量预测模型中,裂纹长度是裂纹扩展速率的重要影响参数之一,针对镍基合金裂尖裂纹长度的扩展规律,研究裂纹长度对镍基合金材料裂纹尖端膜致应力产生的应力应变场的影响,采用ABAQUS软件,在不考虑外载的情况下,分析膜致应力应变场随裂纹扩展长度的改变所导致裂尖力学特性的变化规律。结果表明,裂纹长度不同,裂尖膜致应力产生的应力应变分布不同,膜致应力是裂纹扩展驱动力中不可忽略的主要因素之一。
Oxide film rupture theory has become one of the most popular models to quantitatively predict the stress corrosion cracking rate at crack tip of Ni-based alloys, and crack length has been one of the important parameters of crack growth rate. To understand the micro-mechanical state with different crack length at the tip of Nickel-based alloys without considering the external load, the stress-strain induced by oxide film in the base metal was simulated and discussed using a commercial finite element analysis code. The results show that the stress-strain state induced by oxide film is different because of crack length, and film-induced stress is one of the main factors that can＇t be ignored in the stress corrosion crack growth driving force.
出处
《铸造技术》
北大核心
2017年第6期1274-1277,共4页
Foundry Technology
基金
国家自然科学基金资助项目(51475362
11502195)
陕西省教育厅科研计划资助项目(16JK1493)
关键词
应力腐蚀
裂纹长度
膜致应力
氧化膜
crack length
film-induced stress
oxide film
stress corrosion cracking
