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Characterization of discontinuous crack closure behavior after the application of a single overload cycle
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2021-06-03 , DOI: 10.1016/j.tafmec.2021.103028
Giancarlo L.G. Gonzáles , Julián A.O. González , José L.F. Freire

This paper aims to analyze the discontinuous crack closure behavior observed after a single tensile overload (OL) under otherwise constant ΔK loading. The investigation was performed on a disk-shaped compact tension DC(T) specimen made of Al6351-T6 with thickness of 2 mm, in order to simulate the case of a crack propagating under plane stress conditions. The Digital Image Correlation (DIC) technique was used in situ to obtain the full-field displacement and strain solution around the crack surfaces during the fatigue crack propagation. The experimental data obtained from DIC analysis revels that the residual hump of stretched material left in the wake of the propagating crack by the overload acts like a compliant spring, leading to a discontinuous crack closure mechanism. Moreover, this residual hump has a significant effect on the post-overload transient crack growth, even at distances much larger than the plastically deformed area created by the overload in front of the crack tip.



中文翻译:

应用单个过载循环后不连续裂纹闭合行为的表征

本文旨在分析在其他常数 Δ K下单次拉伸过载 (OL) 后观察到的不连续裂纹闭合行为加载。研究是在由 Al6351-T6 制成的厚度为 2 mm 的盘形紧凑拉伸 DC(T) 试样上进行的,以模拟在平面应力条件下裂纹扩展的情况。原位使用数字图像相关 (DIC) 技术获得疲劳裂纹扩展过程中裂纹表面周围的全场位移和应变解。从 DIC 分析获得的实验数据表明,在超载裂纹扩展后留下的拉伸材料的残余驼峰就像一个柔顺的弹簧,导致不连续的裂纹闭合机制。此外,这种残余驼峰对过载后的瞬态裂纹扩展具有显着影响,即使距离远大于裂纹尖端前过载产生的塑性变形区域也是如此。

更新日期:2021-06-14
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