期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 126, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2019.10.003
关键词
Fatigue crack nucleation; Crystal plasticity; Dislocations; Stored energy; Configurational energy; Nickel superalloys
资金
- Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London - EPSRC [EP/L015579/1]
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.
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