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| Fracture Failure Analysis on Combined Spring Based on Micro and Nanometer Measurement Instrument |
| TANG Xiao-cong,WANG Min,GUO Xin |
| Nanjing Institute of Measurement and Testing Technology, Nanjing, Jiangsu 210049, China |
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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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［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］.
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2020, Vol. 41 
