Mechanical behaviour of dual-phase high-strength steel under high strain rate tensile loading
Mechanical behaviour of dual-phase high-strength steel under high strain rate tensile loading
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高应变率拉伸载荷下双相高强钢的力学行为
DOI：
10.1016/j.msea.2013.07.091
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发表时间：
2013-12-01
期刊：
影响因子：
6.4
通讯作者：
Lu, Fangyun
中科院分区：
文献类型：
--
作者：
Qin, Jingui;Chen, Rong;Lu, Fangyun
研究了应变速率对DP700和DP500两种工业钢拉伸性能的影响。准静态试验(0.001 S(-1))是使用机电万能试验机进行的，而分离式霍普金森拉杆装置用于高应变率(类似于1100 S(-1)，类似于1800 S(-1)，类似于3200 S(-1))。这两种高强度钢表现出显著的应变率敏感性。根据实验结果确定了现有Johnson-Cook模型的材料参数。该模型在塑性区与实验数据吻合较好。采用数字图像相关和高速摄影相结合的方法，研究了高应变率下拉伸试件的应变局部化。利用数字图像相关技术，得到了试件的面内应变场和局部断裂应变。应变场的等高线表明，甚至在达到峰值载荷之前，就出现了早期的局部化。采用非线性显式有限元程序LS-DYNA，采用Johnson-Cook模型对动态拉伸试验进行了数值模拟。在应变片信号、变形几何形状和应变场方面，实验和数值预测之间有很好的相关性。(C)2013爱思唯尔B.V.保留所有权利。
The effects of strain rate on the tensile properties of two commercial steels (DP700 and DP500) were investigated. Quasi-static tests (0.001 s(-1)) were performed using an electromechanical universal testing machine, whereas a split Hopkinson tensile bar apparatus was used for testing at high strain rates (similar to 1100 s(-1), similar to 1800 s(-1), and similar to 3200 s(-1)). The two high-strength steels show significant strain rate sensitivity. The material parameters of the existing Johnson-Cook model were determined from experimental results. This model fits the experimental data well in the plastic zone. Digital image correlation was used together with high-speed photography to study the strain localisation in the tensile specimens at high strain rates. By using digital image correlation, the in-plane strain field and local fracture strain of the specimen were obtained. The contours of the strain field indicate an early localisation even before the peak load is attained. Numerical simulations of the dynamic tensile tests were performed using the non-linear explicit finite element code LS-DYNA with the Johnson-Cook model. Good correlation between the experiments and numerical predictions is achieved, in terms of the strain gauge signals, deformed geometry, and strain field. (C) 2013 Elsevier B.V. All rights reserved.