Abstract：By means of scanning electron microscope, metallographic microstructure observation and analysis, hardness test and chemical composition analysis of materials, the failure reasons of composite spring are explored. The fracture morphology of the spring shows that the spring suffered from fatigue failure, and the in-depth analysis results show that the fracture inducement can be considered as the stress at the contact point of the surface of the middle spring after the abnormal stress distortion of the spring, and the stress concentration starts the crack, thus the fatigue extension and torsion failure.
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Qian G Q, Chen X, Zhang S J. Fracture Analysis of Spiral Compression Springs［J］. Failure Analysis and Prevention, 2018, 13(4): 238-242.
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Tang X B. Fracture Analysis of Rudder Tension Spring of SR20 Aircraft［J］. Journal of Civil Aviation, 2018, 2(6): 107-110.
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Wang B, Wang Z Z, Wang K, et al. Elasticity Influence Analysis of Wave Spring on Aeroengine［J］. Mechanical Engineer, 2019,(5): 119-120.
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Wang X H, Pan A X. Fracture Analysis of Valve Spring［J］. Rail Transportation Equipment and Technology, 2018,(5): 32-34.
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［6］GB/T 6394-2002 金属平均晶粒度测定方法［S］.
［7］GB/T 13299-1991 钢的显微组织评定方法［S］.
［8］GB/T 4340. 1-2009 金属材料 维氏硬度试验 第1部分: 试验方法［S］.
2020, Vol. 41 
