| 摘要: |
| 结合承受扭转切应力和轴向正应力圆柱体的受力分析，讨论了圆柱螺旋弹簧发生的正应力断裂，纵向以及横向切应力断裂等3种疲劳断裂模式。结果指出，喷丸引入的残余正应力（即应力强化机制）只影响正应力而不影响纵/横向切应力断裂模式的疲劳强度（寿命）。但喷丸引起表面形变层内的组织结构改性（即组织结构强化机制）却能提高所有3种断裂模式的疲劳断裂抗力。 |
| 关键词: 圆柱螺旋弹簧 疲劳断裂模式 表面喷丸 应力强化与组织结构强化机制 |
| DOI： |
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| Normal and Shear Fatigue Fracture Modes of Circular Coil Spring and the Approach of Improving Fatigue Fracture Resistance |
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WANG Ren–zhi1, JIANG Chuan–hai21,2
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1. Laboratory of Number 4, Beijing Institute of Aeronautical Materials, Beijing 100095;2. School of Material Science and Engineering, Shanghai Jiao Tong University
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| Abstract: |
| On the basis of the force analysis of the torsional shear stress and axial normal stresses in the cylinder, three fatigue fracture modes of normal tensile fracture, and longitudinal, transverse shear fracture of the circular coil spring were discussed. It was shown that the normal compressive residual stresses induced by shot peening had only influences on the fatigue strength (fracture life) of normal tensile fracture mode, while they had no effect on the fatigue strength under longitudinal and transverse shear fracture mode. The fatigue fracture resistance of the three modes mentioned above, however, can be improved due to the microstructure modification in the spring surface layer introduced by the shot peening. |
| Key words: cylinder coil spring fatigue fracture mode peening the surface stress and microstructure enhancement mechanisms |
