基于有限元法和锁相热像法对含缺陷构件的应力分析与疲劳性能评估  

Stress Analysis and Fatigue Behavior Assessment of Components with Defect Based on FEM and Lock-in Thermography

作　　者：樊俊铃[1,2] 郭强[1] 赵延广[3] 郭杏林[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]中国飞机强度研究所,西安710065 [3]北京航空材料研究院,北京100095

出　　处：《材料工程》2015年第8期62-71,共10页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(11072045)

摘　　要：基于有限元法研究含盲孔缺陷构件的应力集中系数Kt随盲孔深度h和盲孔直径的变化规律。利用锁相热像法的热弹性分析模式(E-Mode)研究盲孔附近的应力分布,预测不同深度盲孔的Kt,与有限元结果相比较发现吻合良好。通过Altair Li软件中的耗散模式(D-Mode)和Altair软件分别研究构件在疲劳过程中的固有耗散量和温度信号的变化规律,以评估疲劳损伤的演化过程。以固有耗散和温度信号的变化规律作为疲劳损伤的指标,快速预测带盲孔试件的疲劳极限,进而预测试件的疲劳缺口系数Kf。理论计算的结果证明了锁相热像法的有效性。The relationships between the stress concentration factor Ktwith the depth hand diameterof the blind hole were investigated based on the FEM.The thermo-elastic analysis mode（E-Mode）built-in the lock-in thermography was utilized to study the stress distribution around the blind hole,and to predict the variation of Ktof different depth.Good predictions were achieved between the thermography and FEM.The variations of the intrinsic dissipation and the temperature signal during fatigue process were studied respectively using the dissipation mode（D-Mode）of Altair Li and Altair software,to evaluate fatigue damage evolution.These two signals were considered as fatigue damage markers to rapidly predict the fatigue limit and the fatigue notch factor Kfof the component with blind hole.The theoretical result validates the capability of the lock-in thermography.

关 键 词：锁相热像法 应力集中 热弹性应力分析 固有耗散 疲劳性能 

分 类 号：TG115.5[金属学及工艺—物理冶金] O343.6[金属学及工艺—金属学]