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

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摘要

基于有限元法研究含盲孔缺陷构件的应力集中系数K_t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K_t,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K_f。理论计算的结果证明了锁相热像法的有效性。

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	樊俊铃
	郭强
	赵延广
	郭杏林

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

Abstract：

The relationships between the stress concentration factor K_t with the depth h and diameter φ 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 K_t of 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 K_f of the component with blind hole. The theoretical result validates the capability of the lock-in thermography.

Key words： lock-in thermography(LT) stress concentration thermo-elastic stress analysis(TSA) intrinsic dissipation fatigue behavior

收稿日期: 2013-12-03 出版日期: 2015-08-17

基金资助:国家自然科学基金资助项目(11072045)

通讯作者: 郭杏林 E-mail: xlguo@dlut.edu.cn

作者简介: 郭杏林(1955—),男,教授,博导,研究方向:工程力学、实验力学、计算力学,联系地址:辽宁省大连市大连理工大学工程力学系工业装备结构分析国家重点实验室(116024),E-mail:xlguo@dlut.edu.cn

引用本文:

樊俊铃, 郭强, 赵延广, 郭杏林. 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[J]. 材料工程, 2015, 43(8): 62-71.
Jun-ling FAN, Qiang GUO, Yan-guang ZHAO, Xing-lin GUO. Stress Analysis and Fatigue Behavior Assessment of Components with Defect Based on FEM and Lock-in Thermography. Journal of Materials Engineering, 2015, 43(8): 62-71.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.08.011 或 http://jme.biam.ac.cn/CN/Y2015/V43/I8/62

Table 1 Q235钢的物理力学性能^[19]

Fig.1 试件尺寸

Fig.2 四分之一模型

Fig.3 随盲孔深度变化的应力场
(a)0.9mm;(b)1.8mm;(c)2.7mm(d)3.6mm;(e)4.5mm;(f)5.0mm

Fig.4 孔底至孔顶的K_t变化

Fig.5 盲孔深度
(a)、盲孔直径(b)与应力集中系数K_t的关系

Fig.6 不同应力幅下盲孔附近的应力分布
(a)σ_a=150MPa；(b)σ_a=170MPa；(c)σ_a=190MPa

Fig.7 190MPa下沿两条路径的应力分布

Fig.8 不同应力幅下的应力集中系数K_t

Fig.9 不同应力下的耗散场(1)和温度场(2)
(a)σ_a=150MPa;(b)σ_a=170MPa;(c)σ_a=190MPa

Fig.10 190MPa下的耗散分布
(a)热像图；(b)两条路径上的耗散值

Fig.11 190MPa下的温度分布
(a)热像图；(b)两条路径上的温度值

Fig.12 疲劳极限的预测 (1)固有耗散；(2)温升规律；
(a)h=0.9mm;(b)h=1.8mm；(c)h=2.7mm

Table 2 有限元法、热弹性应力分析法及锁相热像法的K_f比较

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