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

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。...

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Bibliographic Details
Published in材料工程 Vol. 43; no. 8; pp. 62 - 71
Main Author 樊俊铃 郭强 赵延广 郭杏林
Format Journal Article
LanguageChinese
Published 中国飞机强度研究所，西安710065%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%北京航空材料研究院,北京,100095 2015
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
Subjects
固有耗散
应力集中
热弹性应力分析
疲劳性能
锁相热像法
热弹性应力分析
thermo-elastic stress analysis(TSA)
疲劳性能
固有耗散
lock-in thermography(LT)
应力集中
stress concentration
in-trinsic dissipation
锁相热像法
fatigue behavior
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ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2015.08.011

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Summary: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。
Bibliography:11-1800/TB
lock-in thermography（LT）; stress concentration; thermo-elastic stress analysis（TSA）; intrinsic dissipation; fatigue behavior
FAN Jun-ling , GUO Qiang , ZHAO Yan-guang , GUO Xing-lin （1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, China 2. Aircraft Strength Research Institute of China,Xi＇an 710065,China; 3 Beijing Institute of Aeronautical Materials,Beijing 100095, China）
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
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2015.08.011