Experimental-numerical evaluation of a new butterfly specimen for fracture characterisation of AHSS in a wide range of stress states
Experimental-numerical evaluation of a new butterfly specimen for fracture characterisation of AHSS in a wide range of stress states
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用于 AHSS 在各种应力状态下断裂表征的新型蝶形样本的实验数值评估
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发表时间：
2016
期刊：
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通讯作者：
B
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文献类型：
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作者：
I. Peshekhodov;S. Jiang;M. Vucetic;A. Bouguecha;B
本文介绍了一种新型蝴蝶试样在大范围应力状态下对AHHS板的断裂特征进行实验-数值评估的结果。该试验在单轴拉伸机上进行，为常规断裂模型的标定提供了足够的数据。在第一部分中，给出了数值试样评估的结果，该结果是用双相钢DP600的材料模型进行的，该模型取自具有塑性流动和断裂描述的文献。在第二部分中，显示了对另一种双相钢DP600进行的实验-数值试样评估的结果，该双相钢仅具有塑性流动的描述，其断裂行为在本工作的框架中进行了表征。研究了新型蝴蝶试件在不同载荷情况下的整体性能，并对AHSS的断裂行为进行了表征。定量分析了断裂应变与应力三轴性、Lode角以及空间分辨率的关系。在此基础上，提出了参数化的CrachFEM韧性剪切断裂模型和修正的mohr - colummb韧性剪切断裂模型。测试过程和结果分析被认为有助于当前对AHSS断裂特征要求的讨论。
Results of an experimental-numerical evaluation of a new butterfly specimen for fracture characterisation of AHHS sheets in a wide range of stress states are presented. The test on the new butterfly specimen is performed in a uniaxial tensile machine and provides sufficient data for calibration of common fracture models. In the first part, results of a numerical specimen evaluation are presented, which was performed with a material model of a dual-phase steel DP600 taken from literature with plastic flow and fracture descriptions. In the second part, results of an experimental-numerical specimen evaluation are shown, which was conducted on another dual-phase steel DP600, which was available with a description of plastic flow only and whose fracture behaviour was characterised in the frame of this work. The overall performance of the new butterfly specimen at different load cases with regard to characterisation of the fracture behaviour of AHSS was investigated. The dependency of the fracture strain on the stress triaxiality and Lode angle as well as space resolution is quantified. A parametrised CrachFEM ductile shear fracture model and modified Mohr-Coloumb ductile shear fracture model are presented as a result of this quantification. The test procedure and results analysis are believed to contribute to current discussions on requirements to AHSS fracture characterisation.