Micro mechanics based on vacancy diffusion coupled with damage mechanics related to creep deformation and prediction of creep fracture life
Micro mechanics based on vacancy diffusion coupled with damage mechanics related to creep deformation and prediction of creep fracture life
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基于空位扩散的微观力学与蠕变变形相关的损伤力学以及蠕变断裂寿命的预测
DOI：
10.3184/096034011x13061599631976
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发表时间：
2011
影响因子：
1.3
通讯作者：
H. Ishikawa
中科院分区：
文献类型：
--
作者：
A. Yokobori;Kunihiko Abe;Hironori Tsukidate;T. Ohmi;R. Sugiura;H. Ishikawa
对P92和钛铝化物金属间化合物在蠕变条件下的裂纹扩展和损伤扩展进行了原位观察。提出了应力诱导粒子扩散分析方法，并将其应用于应力诱导空位扩散。分析结果成功地与宏观损伤演化的实验行为相关联，得到了蠕变变形的理论特征。结果表明，该模型与蠕变变形实验特征吻合较好。此外，与晶界空洞和微裂纹形成有关的蠕变损伤过程的实验特征与变形特征具有很好的相关性。成功地实现了纳米尺度的空位扩散、中观尺度的蠕变损伤和宏观尺度的蠕变变形之间的关联。
Abstract In situ observations of crack growth and damage progression were conducted under creep conditions for P92 and titanium aluminides inter-metallic compound. A proposed analysis of stress induced particle diffusion was applied to stress induced vacancy diffusion. Results obtained from this analysis were successfully correlated with the experimental behaviour of macroscopic damage progression and a theoretical characteristic of creep deformation was derived. It was found to be in good agreement with experimental characteristics of creep deformation. Furthermore, the experimental characteristics of creep damage progression which concern voids and micro crack formations at grain boundary were found to be well correlated with those of deformation. From these results, correlation between vacancy diffusion in nano-scale, creep damage in mezzo-scale and creep deformation in macro-scale were successfully realized.