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首页> 外文期刊>Journal of Materials Engineering and Performance >Ductile Fracture Initiation of Anisotropic Metal Sheets
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Ductile Fracture Initiation of Anisotropic Metal Sheets

机译：各向异性金属板的韧性骨折开始

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The objective of this research is to investigate the influence of material plastic anisotropy on ductile fracture in the strain space under the assumption of plane stress state for sheet metals. For convenient application, a simple expression is formulated by the method of total strain theory under the assumption of proportional loading. The Hill 1948 quadratic anisotropic yield model and isotropic hardening flow rule are adopted to describe the plastic response of the material. The Mohr-Coulomb model is revisited to describe the ductile fracture in the stress space. Besides, the fracture locus for DP590 in different loading directions is obtained by experiments. Four different types of tensile test specimens, including classical dog bone, flat with cutouts, flat with center holes and pure shear, are performed to fracture. All these specimens are prepared with their longitudinal axis inclined with the angle of 0 degrees, 45 degrees, and 90 degrees to the rolling direction, respectively. A 3D digital image correlation system is used in this study to measure the anisotropy parameter r(0), r(45), r(90) and the equivalent strains to fracture for all the tests. The results show that the material plastic anisotropy has a remarkable influence on the fracture locus in the strain space and can be predicted accurately by the simple expression proposed in this study.
机译：本研究的目的是在薄片金属的平面应力状态假设下研究材料塑性各向异性对应变空间中的延性断裂的影响。为了方便的应用，通过比例载荷的总应变理论的方法制定简单的表达。采用山山1948二次各向异性产量模型和各向同性硬化流量规则来描述材料的塑料响应。重新检测MoHR-Coulomb模型以描述应力空间中的延性骨折。此外，通过实验获得DP590的DP590的断裂轨迹是通过实验获得的。四种不同类型的拉伸试样，包括古典狗骨，扁平与切口，平面与中心孔和纯剪切，进行裂缝。所有这些样品都是用它们的纵向轴线倾斜0度，45度和90度的纵向轴线。在该研究中使用3D数字图像相关系统来测量各向异性参数R（0），R（45），R（90）和等效菌株以用于所有测试的裂缝。结果表明，材料塑性各向异性对应变空间中的裂缝基因座具有显着影响，并且可以通过本研究提出的简单表达式准确地预测。

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