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超高强度钢板作为轻量化材料广泛应用于热冲压中,研究其高温下的力学性能显得尤为重要。首先对超高强钢B1500HS进行了胀形实验,研究了常温,700℃,800℃下的成形极限曲线(FLD);同时,运用有限元软件建立了FLD非线性和线性数值计算模型,对高温成形极限曲线进行了数值模拟预测。研究发现,常温下可以通过改变润滑条件拓展双拉区域数据点,而高温下双拉区域数据点较少,且缺少等拉数据点;数值模拟可以对热冲压FLD进行准确的预测,非线性计算模型比线性计算模型稳定,且更加接近实验曲线,数值模拟曲线范围更广,且仿真时通过改变摩擦系数可以获得高温下等拉数据点。
Ultra-high strength steel is widely used in hot stamping as a lightweight material. It is very important to study its mechanical properties under high temperature. At first, the forming limit curve (FLD) of B1500HS was studied at room temperature, 700 ℃ and 800 ℃. At the same time, the FLD nonlinear and linear numerical model was established by using finite element software. The limit curve is numerically simulated and predicted. The results show that the data points can be expanded by changing the lubrication conditions at room temperature, but there are few data points in the double pull area at high temperature, and the data points are not drawn. The numerical simulation can accurately predict the hot stamped FLD, and the nonlinear calculation The model is more stable than the linear calculation model and closer to the experimental curve. The numerical simulation curve has a wider range. The data point of high-temperature pull-down can be obtained by changing the friction coefficient.