Discrete dislocation, crystal plasticity and experimental studies of fatigue crack nucleation in single-crystal nickel
Discrete dislocation, crystal plasticity and experimental studies of fatigue crack nucleation in single-crystal nickel
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DOI：
10.1016/j.ijplas.2019.10.003
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发表时间：
2020-03
影响因子：
9.8
通讯作者：
N. Prastiti;Yilun Xu;D. Balint;F. Dunne
中科院分区：
文献类型：
--
作者：
N. Prastiti;Yilun Xu;D. Balint;F. Dunne
位错组态能量和存储的能量密度分别在离散位错和晶体塑性建模和评估与单晶镍疲劳裂纹成核实验。三种技术之间的直接比较提供了两个晶体取向疲劳试验。这些提供了确认，这两个量正确地识别疲劳裂纹成核的网站和存储的能量密度是一个合理的近似更严格的位错组态能量。GND密度被证明是重要的，在定位裂纹成核的网站，因为它的作用，在当地的组态能量密度。
Dislocation configurational energy and stored energy densities are determined in discrete dislocation and crystal plasticity modelling respectively and assessed with respect to experiments on single crystal nickel fatigue crack nucleation. Direct comparisons between the three techniques are provided for two crystal orientation fatigue tests. These provide confirmation that both quantities correctly identify the sites of fatigue crack nucleation and that stored energy density is a reasonable approximation to the more rigorous dislocation configurational energy. GND density is shown to be important in locating crack nucleation sites because of its role in the local configurational energy density.