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为确定2A16-O铝合金板材在不同温度及应变率下的成形极限曲线(FLCs),应用改进Hollomon公式获取满足外插可靠度的拟合应力应变,通过有限元分析(FEA)不同椭圆度的椭圆凹模胀形破裂位置,优化工艺参数得到指定应变路径下的成形极限点,建立了液体压力与等效应变及应变率的公式,推导出压力变化率与应变率的定量关系。以应变率控制的椭圆凹模胀形与单拉试验相结合,获得2A16-O铝合金板材在不同温度及应变率下的FLCs,为定量分析应变率的影响规律和评判理论预测方法的准确性提供了依据。
In order to determine the forming limit curves (FLCs) of 2A16-O aluminum alloy sheets at different temperatures and strain rates, the fitted Hollomon equation was used to obtain the fitted stress-strain curves which meet the requirements of extrapolation reliability. Through finite element analysis (FEA) Elliptical die bulging rupture position, the process parameters are optimized to obtain the forming point under the specified strain path. The formulas of liquid pressure and equivalent strain and strain rate are established, and the quantitative relationship between the rate of pressure change and the strain rate is deduced. The FLCs of 2A16-O aluminum alloy sheets at different temperatures and strain rates were obtained by combining strain-rate-controlled elliptical die bulging and single-pull test to determine the effect of quantitative strain rate and to evaluate the accuracy of the theoretical prediction method Provided the basis.