平板撞击中应变波沿板面的传播

文中计算了铝板受撞击杆未穿透撞击时弹塑性应变波沿板面的传播，并与实验结果相验证。结果表明，板不太厚时，计入膜力和剪切的板弯曲理论和三维分析的结果都与实验结果相符合。为模拟杆的撞击计算时取其直接被撞部分的板具有击杆的速度和动量，其余部分为静止。板内剪切、弯曲和中面变形三者的弹塑性本构关系可以假定为不相耦合。实验中，用气炮射击铝杆，击中板后，用应变片，动态应变记录仪记录板面不同位置的应变历程。

THE STRAIN WAVE PROPAGATION ON AN IMPACTED PLATE

The Elastic-Plastic strain wave propagation on the plate impacted by a hitter is computed and compared with experimental results in this paper. It shows, when the thickness of a plate is not too thick, the results of both plate bending account with shear and membrane forces and three dimensional calculation match the experimental data considerably. To simulate the hitter impact, at the beginning of impact, assume just the impacted part of a plate got the same velocity and momentum of the hitter and the other parts are still at rest. The shear, bending and membrane can be considered not coupled in their constitutive relations. As the experimental study, a hitter is fired from a gas gun. After the hitter hits a plate the strain histories at some points of the plate can be measured by strain gages and recorded by an oscilloscope.