基于应力功恒等法的振动时效研究  

Study on Vibratory Stress Relief Based on Stress Work Equivalence Method

作　　者：胡永会[1] 吴运新[1] 郭俊康[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《噪声与振动控制》2010年第6期27-33,共7页Noise and Vibration Control

基　　金：国家重点基础研究发展规划项目973项目(编号:2005CB623708)

摘　　要：振动时效主要用于消减构件的残余应力,本质上类似于应力松弛,应变变程恒定的情况下峰值应力随周期减小。材料发生应力松弛的部分为应力集中区,振动时效过程中产生局部塑性应变。针对如7075高强铝合金幂次硬化材料,可以采用基于等效线弹性模型的应力功恒等法近似计算材料的局部应力和应变变程,以弥补实验过程需要测量但不易获得的重要数据。计算得到的应力-应变曲线与流变塑性理论公式推导的结果及其它研究者通过模型仿真得到的结果相似,表明应力功恒等法应用于振动时效分析具有计算简单,准确实用的特点,对工程实践有一定的参考价值和指导作用。Vibratory stress relief（VSR） is used to release residual stress in components.It is a kind of stress relaxation phenomenon occurring at constant strain range with the peak stress decreasing with cycles.VSR causes stress relief and local plastic deformation in stress concentration regions.Based on an equivalent linear elastic model,the stress work equivalence method can be used to calculate local stress and strain range of power-law hardening materials,such as 7075 high strength aluminum alloy,in order to obtain important data which may be difficult to be measured by experiments.The similarities between the present calculated stress-strain curve and that resulted from rheological plasticity theoretical formula or observed by some other researchers from model simulation show that it is simple and practical to apply the stress work equivalence method in VSR analysis,and this method is instructive and meaningful for engineering practices.

关 键 词：振动与波 振动时效 残余应力 应变变程 等效线弹性模型 应力功恒等法 

分 类 号：O344[理学—固体力学] TB534[理学—力学]