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

机译:宏观和微观尺度先进高强度钢的故障特性

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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)从世界各地的研究小组中获得了重大关注,特别是在过去的二十年中。这些钢的成形行为的确切描述具有与其相关的几个挑战。这些挑战的起源与宏观和微尺度的AHSS纸张的复杂成形行为和失效特性有关。在本研究中,使用单轴张力和剪切试验研究了两个重要的AHSS的断裂特性,即DP980和TRIP1180。考虑使用数字图像相关(DIC)技术的缩颈和裂缝计算临界菌株。在宏观和微观规模中检查变形样品,以了解两个钢的断裂机制。进行数值模拟,用于识别和验证本构参数。使用简单的裂缝法预测骨折,并将结果与​​实验进行比较。 DP980和TRIP1180实现了合理的断裂预测。

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