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一个具有附加撞击面的钢制弹体(重65.6g,撞击面直径1cm),通过朝向厚0.5～0.8cm的固定靶板的冲击波加速到25.6m/s。光滑自由面上的膨胀变形是用激光多普勒速度干涉仪测量的。厚(1.2～2.4cm)的靶板首先用来测定固体中的弹性波速度,而较薄的靶板用来测定自由面的膨胀塑性变形。与厚度有关的最大膨胀速度是在厚0.5～0.8cm的靶板中测得的。测验结果表明,最大膨胀速度随靶板厚度的增加而减少。与时间有关和与靶板厚度有关的软钢靶板的膨胀塑性变形性能是在撞击速度
A steel projectile with an additional impact face (weight 65.6 g, impact face diameter 1 cm) is accelerated to 25.6 m / s by a shock wave directed towards a fixed target plate 0.5 to 0.8 cm thick. The swelling deformation on the smooth free surface is measured with a laser Doppler speed interferometer. Thick (1.2 ~ 2.4cm) target plate was first used to determine the elastic wave velocity in solid, while the thinner target plate was used to determine the free plastic expansion plastic deformation. The maximum rate of expansion associated with the thickness is measured in the target 0.5 to 0.8 cm thick. The test results show that the maximum expansion rate decreases with the increase of target thickness. The time-dependent and expansive plastic deformation behavior of the mild steel target plate, which is related to the thickness of the target plate,