期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 148, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106203
关键词
Titanium alloys; Micro-textured region; Fatigue crack initiation; Crystal plasticity modelling
资金
- Shanghai Sailing Program [20YF1431600]
- National Natural Science Foundation of China [12002211]
This study investigates the fatigue crack initiation in MTRs using a crystal plasticity model, revealing that crack initiation is mainly attributed to high plastic strain and stress concentrations.
Micro-textured regions (MTRs) are the presence of large regions of ? grains aggregates with strong local texture, which are detrimental to the fatigue performances in titanium alloys. This work proposes an EBSD map-image based crystal plasticity model to study the fatigue crack initiation in MTRs. Crystal plasticity simulations reveal that the crack initiation may be attributed to the significantly high plastic strain accumulated on prismatic (a) slip systems leading to significantly high dislocation pile-ups, and high stress concentrations on the cluster of hard grains leading to the stress redistribution and cleavage fracture of the specimen.
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