基于损伤容限设计的同步辐射装置挡光元件热疲劳寿命分析  

Analysis of thermal fatigue life for high load component at synchrotron radiation facility based on damage tolerance

作　　者：殷琰 来显凯 YIN Yan;LAI Xiankai(School of Urban Planning and Municipal Enginering,Xi'an Polyechnic University,Xi'an 710048,Shaanxi,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048

出　　处：《实验力学》2022年第4期528-540,共13页Journal of Experimental Mechanics

基　　金：国家自然科学基金(10975130)资助;国家留学基金管理委员会(201406340014)资助。

摘　　要：以同步辐射装置前端区挡光元件为分析对象,通过低周疲劳试验得到元件制作材料的裂纹扩展速率公式,利用热负载下典型元件结构的温度和弹塑性应力应变有限元模拟结果,采用损伤容限设计方法并结合Miner线性损伤累积理论进行元件疲劳寿命分析,据此提出基于损伤容限设计理论的挡光元件热疲劳有限寿命设计方法。结果显示,静强度设计方法过于保守,局部应力应变分析法也有不足,基于损伤容限设计的元件有限寿命设计方法可为装置总体性能的提升提供参考。Low-cycle fatigue experiments were conducted to obtain the crack propagation equation of the material for the components at the front end of synchrotron radiation facility.The temperature and the elastoplastic stress-strain are simulated with FEM for a typical high heat load component.In view of damage tolerance design,the crack propagation equation of the material for the components is introduced to predict the fatigue lives,combining with the Miner linear cumulative damage theory.Meanwhile,a thermal fatigue life evaluation method for the high heat load components is ultimately provided.It is revealed that the static strength design method is too conservative and the local equivalent strain model is not reasonable and comprehensive for engineering.Therefore,the finite life design method based on damage tolerance theory is accordingly proposed,which aims to improve the current conservative design method and to promote the overall performance of the facility.

关 键 词：热疲劳 损伤容限 疲劳寿命预测 挡光元件 有限元模拟 

分 类 号：O346.2[理学—固体力学]