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Failure characteristics of advanced high strength steels at macro and micro scales

机译:先进的高强度钢在宏观和微观尺度上的破坏特征

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摘要

The advanced high strength steels (AHSS) have gained major attention from research groups across the world especially in the last two decades. The exact description of the forming behavior of these steels has several challenges associated with it. The origin of these challenges is related to complex forming behavior and failure characteristics of AHSS sheets at macro and micro scale. In the present study, the fracture characteristics of two important AHSSs, i.e. DP980 and TRIP1180, were investigated using uniaxial tension and shear tests. The critical strains were calculated considering both necking and fracture using digital image correlation (DIC) technique. The deformed specimens were examined at macro and micro scale to understand the fracture mechanisms of both steels. Numerical simulations were performed for identification and validation of constitutive parameters. A simple fracture law was used to predict the fracture and the results were compared with the experiments. Reasonable fracture prediction was achieved for both DP980 and TRIP1180.
机译:先进的高强度钢(AHSS)特别是在过去的二十年中,受到了世界各地研究小组的广泛关注。对这些钢的成形行为的准确描述存在一些与之相关的挑战。这些挑战的起源与宏观和微观的AHSS板材的复杂成形行为和破坏特征有关。在本研究中,使用单轴拉伸和剪切试验研究了两个重要的AHSS的断裂特性,即DP980和TRIP1180。使用数字图像相关(DIC)技术,同时考虑了颈缩和断裂,计算了临界应变。对变形后的试样进行了宏观和微观检验,以了解两种钢的断裂机理。进行数值模拟以识别和验证本构参数。使用简单的断裂定律预测断裂,并将结果与​​实验进行比较。 DP980和TRIP1180均实现了合理的断裂预测。

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