Experimental and numerical investigations into the ductile fracture during the forming of flat-rolled 5083-O aluminum alloy sheet
Experimental and numerical investigations into the ductile fracture during the forming of flat-rolled 5083-O aluminum alloy sheet
复制标题
5083-O 铝合金平轧板成形过程中延性断裂的实验和数值研究
DOI：
10.1016/j.jmatprotec.2015.01.031
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发表时间：
2015-06
影响因子：
6.3
通讯作者：
Wang Qian
中科院分区：
文献类型：
--
作者：
Qian Ling-Yun;Fang Gang;Zeng Pan;Wang Qian
为了研究5083-O铝合金板材成形过程中的韧性断裂，并建立合理的韧性断裂判据，对7个不同形状的试件进行了拉伸试验，试件的主要变形区域分别承受了从剪切到平面应变的不同应力状态。断裂应变，代表成形极限，确定通过应用相结合的实验-数值方法。采用二维数字图像相关（DIC）方法测量了表面应变场，同时通过有限元（FE）模拟预测了局部应力和应变历史。计算每个样本的应力三轴度和断裂起始的矿脉参数（表征应力状态）。分析表明，断裂应变对矿脉参数不敏感，但强烈依赖于应力三轴度。断裂应变和应力三轴度空间中的断裂轨迹符合Johnson-Cook断裂准则。然后将Johnson-Cook断裂准则应用于ABAQUS/Explicit代码中，以预测三个受到球冲压变形的试样的断裂起始点。用DIC-3D测量了这些试件的应变场，结果与数值计算结果一致。采用Johnson-Cook断裂准则，准确预测了其断裂位置和行程。
The present research aimed to investigate the ductile fracture during the forming of 5083-O aluminum alloy sheet and establish a rational criterion to predict it. Seven specimens with different shapes were tension-tested, and the main deformation areas of the specimens were subjected to various stress states ranging from shear to plane strain. Fracture strains, representing the forming limits, were determined by applying a combined experimental–numerical approach. Surface strain fields were measured by using the two-dimensional digital image correlation (DIC) method, while the local stress and strain histories were predicted by finite element (FE) simulations. The stress triaxiality and Lode parameter (characterizing the stress state) of fracture onset were calculated for each specimen. The analysis indicated that the fracture strain was insensitive to the Lode parameter but strongly dependent on the stress triaxiality. The fracture locus in the space of the fracture strain and stress triaxiality fitted in with the Johnson–Cook fracture criterion. The Johnson–Cook fracture criterion was then implemented into the ABAQUS/Explicit code to predict the fracture onsets of three specimens subjected to ball punch deformation. The strain fields of these specimens measured by DIC-3D were in agreement with the numerical results. Their fracture locations and strokes were accurately predicted by using the Johnson–Cook fracture criterion.
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DOI：
10.1016/j.ijsolstr.2010.07.010
发表时间：
2010-07
影响因子：
3.6
作者：
M. Luo;T. Wierzbicki
通讯作者：
M. Luo;T. Wierzbicki
DOI：
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发表时间：
1961
期刊：
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影响因子：
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DOI：
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1997-08
期刊：
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DOI：
10.1016/j.ijsolstr.2012.11.026
发表时间：
2013-04-01
影响因子：
3.6
作者：
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通讯作者：
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影响因子：
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作者：
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