Abnormal Load Loss and Cause Analysis of Spring Stress Relaxation
WU Hulin1, LI Zhongsheng1, JIN Yingrong2,*, HE Yi2
1 Southwest Institute of Technology and Engineering, Chongqing 400039, China 2 School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
Abstract: It is of great significance to reveal the relationship between spring stress relaxation performance and the microstructure of spring material for the development of new spring materials and the improvement of spring performance. In this work, effects of test temperature and initial load on the load loss and microstructure of the cylindrical helical compression spring were studied by periodic test method. The results show that the coupling effect of temperature and initial load can cause the abnormal load loss-the slight initial load will cause larger load loss at lower temperature than that at higher temperature, after stress relaxation, a strip structure composed of dislocation rich and dislocation poor regions was formed in the spring material. Due to the structural characteristics of materials, and by introducing the concepts of activable dislocation and inactive dislocation, activable stress and inactive stress, the logarithmic equation of stress relaxation is derived, the physical meaning of the equation is clarified, and the abnormal change phenomenon of load is explained. It is considered that the stress relaxation is caused by the movement of activable dislocations since the combined action of activable stress and thermal activation.
吴护林, 李忠盛, 金应荣, 贺毅. 弹簧应力松弛反常载荷损失及原因分析[J]. 材料导报, 2023, 37(23): 22090089-6.
WU Hulin, LI Zhongsheng, JIN Yingrong, HE Yi. Abnormal Load Loss and Cause Analysis of Spring Stress Relaxation. Materials Reports, 2023, 37(23): 22090089-6.
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2023, Vol. 37 
