西华大学学报（自然科学版）2025，Vol.44Issue(5)：8-16,9.DOI:10.12198/j.issn.1673-159X.5059
初始载荷-温度耦合作用对弹簧应力松弛的影响
Effect of Initial Load-temperature Cooperation on Spring Stress Relaxation
摘要
Abstract
Investigating the microstructure evolution during stress relaxation in springs is of great sig-nificance for revealing the underlying relaxation mechanisms,optimizing service conditions,and develop-ing novel spring materials.In this study,the effects of dislocation unpinning and recovery on spring stress relaxation were systematically examined under coupled initial load-temperature conditions,and the post-re-laxation microstructure was analyzed.The results indicate that when the initial load is 70%and 80%of the design load and the test temperature is below 393 K,the spring exhibits significant load loss,which is at-tributed to the weakened pinning effect of Cottrell atmospheres on dislocation motion.When the initial load reaches 90%and 100%of the design load,the load loss of the spring increases with higher test temperat-ures.Once the initial load exceeds the design load,intermittent relaxation phenomena occur due to the syn-ergistic interaction between dislocation unpinning and recovery.The stress relaxation caused by dislocation motion primarily involves two processes:unpinning and recovery.Dislocation unpinning triggers the trans-formation from elastic strain to plastic strain,while recovery facilitates the dissipation of plastic strain en-ergy.As the unpinning and recovery processes proceed,the material's microstructure undergoes continuous evolution.关键词
弹簧应力松弛/微细结构演变/位错运动/间歇松弛/初始载荷/Cottrell气团Key words
spring stress relaxation/microstructure evolution/dislocation movement/intermittent relaxation/initial load/Cottrell atmosphere分类
航空航天引用本文复制引用
金应荣,苏懿,王心雨,冉渭,贺毅..初始载荷-温度耦合作用对弹簧应力松弛的影响[J].西华大学学报（自然科学版）,2025,44(5):8-16,9.基金项目
西南技术工程研究所合作基金项目(HDHDW5902020301). （HDHDW5902020301）
