利用单轴和双轴拉伸试验的硬化曲线和各向异性参数对双相钢进行深拉模拟

Archit Shrivastava, D Ravi Kumar
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摘要

在各种因素中,金属板材成型工艺数值模拟预测的准确性取决于用于定义毛坯材料力学行为的材料模型。定义流动曲线和塑性应变比的硬化模型系数通常通过单轴拉伸试验确定。先进的各向异性屈服标准包含了等轴拉伸时的材料流动行为和塑性应变比。在这项工作中,使用双相钢(DP600)板材模拟了平底圆柱形杯的深拉伸。模拟中的各向异性屈服准则采用了通过液压鼓包试验和十字形试样试验获得的双轴材料特性。硬化曲线采用不同的硬化定律进行推断,其中的系数根据单轴拉伸试验和液压鼓包试验获得的应力-应变曲线确定。预测的拉拔峰值载荷和拉拔杯的厚度变化与深拉拔的实验结果进行了比较。
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Deep drawing simulation of dual phase steel using hardening curves and anisotropic parameters from uniaxial and biaxial tensile tests
Among the various factors, the accuracy of the predictions from the numerical simulation of sheet metal forming processes depends on the material model used to define the mechanical behavior of the blank material. The coefficients of the hardening model to define the flow curve and the plastic strain ratios are commonly determined using the uniaxial tensile tests. The advanced anisotropic yield criteria incorporate material flow behaviour and plastic strain ratio in equi-biaxial tension. In this work, deep drawing of a flat bottom cylindrical cup has been simulated using dual-phase steel (DP600) sheets. The biaxial material properties obtained by conducting hydraulic bulge test and cruciform specimen test are used in the anisotropic yield criteria in the simulations. The hardening curves are extrapolated using different hardening laws in which the coefficients are determined from the stress-strain curves obtained from both uniaxial tensile and hydraulic bulge tests. The predicted peak drawing load and thickness variation in the drawn cups are compared with the experimental results of deep drawing.
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