ZHOU Suxia,SHANG Hao,ZHANG Zhao. Effect of inner and outer defect coupling on crack initiation of axle based on crystal plasticity theory[J]. Journal of Mechanical Strength,2026,48(5):58-65.
ZHOU Suxia,SHANG Hao,ZHANG Zhao. Effect of inner and outer defect coupling on crack initiation of axle based on crystal plasticity theory[J]. Journal of Mechanical Strength,2026,48(5):58-65.DOI: 10.16579/j.issn.1001.9669.2026.05.007.
Effect of inner and outer defect coupling on crack initiation of axle based on crystal plasticity theory
This study aims to investigate the coupling effect between inner and outer defects on fatigue crack initiation in high-speed train axles to ensure operational safety.
Methods
2
Firstly
a multi-crystal finite element model was established at the mesoscopic scale based on crystal plasticity theory. Secondly
tensile and impact tests were conducted
and finite element simulations were utilized to analyze the stress field and structural deformation around these defects. Finally
the crack initiation location was predicted based on the characteristics of stress distribution and plastic strain energy density.
Results
2
The findings indicate that the interaction between the two defects strengthens as the inner defect approaches the outer defect
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