喷丸后扭转疲劳极限提高的主要原因是残余压应力的作用。
Compressive residual stress are the main factor in the increase of torsion fatigue limit.
根据应力场强法，分析了旋转弯曲疲劳极限与扭转疲劳极限之间的关系。
Through the stress field intensity approach, the relationship between the rotary bending fatigue limit and torsion fatigue limit was studied.
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