In this paper, specimens were first pre-stretched to different pre-strain coefficients (0, 0.4 and 0.8) under quasi-static tensile for AA6061-O aluminum alloy. Then, the specimens with different pre-strain coefficients were stretched by a high-speed tensile machine (HTM) at different strain rates (200 s^− 1, 400 s^− 1 and 600 s^− 1). Digital image correlation (DIC) technique was employed to measure the strains. The results showed that the yield ratio increased significantly with the pre-strain increased. As the pre-strain coefficient increased, high-speed tensile strain limitation decreased and the total tensile strain limitation increased. A modified Johnson-Cook (JC) model considering pre-strain coefficient was proposed. Numerical simulations were performed using LS-DYNA with the modified JC model. The strain field of the specimen taken by the camera agreed well with the simulated strain field.

在本文中，首先将样品在Aa6061-O铝合金的准静态拉伸下预拉伸到不同的预应变系数（0、0.4和0.8）。然后，将具有不同预应变系数的试样通过高速拉伸机（HTM）以不同的应变速率（200 s ^- 1，400 s ^-1和600 s ^-1）拉伸。）。使用数字图像相关（DIC）技术来测量应变。结果表明，随着预应变的增加，屈服比显着提高。随着预应变系数的增加，高速拉伸应变极限减小，总拉伸应变极限增大。提出了一种修正的考虑预应变系数的Johnson-Cook（JC）模型。使用LS-DYNA和改进的JC模型进行了数值模拟。相机拍摄的样品的应变场与模拟应变场吻合得很好。