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材料工程  2015 

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

DOI: 10.11868/j.issn.1001-4381.2015.08.011, PP. 62-71

Keywords: 锁相热像法,应力集中,热弹性应力分析,固有耗散,疲劳性能

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Abstract:

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φ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AltairLi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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