Dynamic ductile fracture of aluminum SEN specimens an experimental numerical analysis
Dynamic ductile fracture of aluminum SEN specimens an experimental numerical analysis
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DOI：
10.1007/978-94-017-2854-6_3
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发表时间：
1998-09
期刊：
影响因子：
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通讯作者：
Jonghee Lee;M. T. Kokaly;A. Kobayashi
中科院分区：
文献类型：
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作者：
Jonghee Lee;M. T. Kokaly;A. Kobayashi
采用混合实验-数值和实验分析来探索与 1.6 mm 厚度的 7075-T6 和 2024-T3 铝合金单边缺口 (SEN) 样品中裂纹快速扩展相关的可能的动态延性断裂参数。动态莫尔干涉仪用于记录位移场，该位移场可用于驱动断裂 SEN 样本的动态弹塑性有限元 (FE) 模型，也可单独用于确定裂纹尖端 J 积分、Tε* 积分和裂纹尖端张开角度 (CTOA)。随着裂纹的扩展，近场J消失，但近场Tε*达到恒定值。与低裂纹速度相关的 CTOA 在裂纹扩展期间也保持恒定，但在较高裂纹速度时波动。这项初步研究的结果表明，为稳定裂纹扩展而提出的 Tε* 或 CTOA 标准可能是表征这些薄铝样品中快速裂纹扩展的合适参数。
Hybrid experimental-numerical and experimental analyses were used to explore possible dynamic ductile fracture parameters associated with rapid crack propagation in 7075-T6 and 2024-T3 aluminum alloy, single edge notched (SEN) specimens of 1.6 mm thickness. Dynamic Moiré interferometry was used to record the displacement field, which was used either to drive a dynamic elasto-plastic finite element (FE) model of the fracturing SEN specimen or by itself, to determine the crack-tipJ-integral, theTε*-integral and the crack tip opening angle (CTOA). The near-fieldJvanished but the near-fieldTε*reached a constant value with crack propagation. The CTOA associated with a low crack velocity also remained constant during crack propagation but fluctuated at higher crack velocity. The results of this preliminary study suggest that either theTε*or the CTOA criteria proposed for stable crack growth could be a suitable parameter for characterizing rapid crack propagation in these thin aluminum specimens.