Evaluation of multiple cracks interaction effect subjected to biaxial tension under creep regime

Evaluation of multiple cracks interaction effect subjected to biaxial tension under creep regime
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蠕变状态下双轴拉伸下多裂纹相互作用效应的评估

DOI:
10.1016/j.ijmecsci.2017.01.025
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发表时间:
2017-03
影响因子:
7.3
通讯作者:
Zhao L
Zhao L
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu Lianyong;Zhao Lei;Jing Hongyang;Han Yongdian;Xu Lianyong;Zhao Lei;Jing Hongyang;Han Yongdian;Zhao L

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在蠕变状态下,与单个裂纹的情况相比,由于相邻裂纹的相互作用和聚结引起较高的 C* 值,多个裂纹会显着降低部件的使用寿命。本文计算了在不同裂纹形态、蠕变特性和双轴应力比下,承受双向拉伸载荷的板中两个相同共面表面缺陷的蠕变相互作用效应。结果表明,蠕变相互作用水平很大程度上取决于裂纹深度、裂纹距离、蠕变指数和双轴应力比,而裂纹形状影响不大。此外,由沿裂纹前沿的平均C*值确定的蠕变相互作用因子可以更好地代表双轴应力状态下多裂纹的相互作用。最后,在综合有限元分析的基础上,建立了蠕变相互作用因子的经验方程,并由蠕变相互作用因子确定替代相互作用的多条裂纹的等效单裂纹的尺寸。
Under creep regime, the multiple cracks would remarkably deteriorate the service life of the component with respect to the case of a single crack due to the higherC* values induced by the interaction and coalescence of the adjacent cracks. In this paper, the creep interaction effect of two identical coplanar surface flaws in a plate subjected to biaxial tension loads were calculated under various crack configurations, creep properties and biaxial stress ratios. The results revealed that the creep interaction level was greatly dependent on crack depth, crack distance, creep exponent and biaxial stress ratio whereas crack shape had little influence. In addition, the creep interaction factor determined by the averageC* values along the crack front could better represent the multiple cracks interaction under biaxial stress state. Finally, an empirical equation for the creep interaction factor was established on the basis of the comprehensive finite element analyses and the size of the equivalent single crack replacing the interacted multiple cracks should be determined by the creep interaction factor.
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