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本文通过实验和分析来研究膨胀波在有限多层组合体中传播时的距离效应。组合体由5、10和15层相同的双层板组成,并分别作了三次实验。板面与波的传播方向垂直。应力波由空气炮加速的抛射体端面撞击而产生,其应力脉冲宽接近4倍双层板厚。用两种一维波的传播计算程序来分析问题,并与实验结果相比较。这些结果表明:所有这三种厚度的组合体内,波的形状本质上是一致的,而波形的变异发生在组合体外部边界上。在组合体内,所有双层板对应点上的质点速度—时间曲线均基本一致。
In this paper, we study the distance effect of the expansion wave propagating in a finite multi-layer assembly by experiment and analysis. The assembly consisted of the same bilayer plates of 5, 10 and 15 layers, and three experiments were performed separately. Plane and wave propagation direction perpendicular. The stress wave is generated by the impact of the projectile surface accelerated by the air gun, and its stress pulse width is nearly 4 times the double plate thickness. Two kinds of one-dimensional propagation calculators were used to analyze the problem and compare it with the experimental results. These results show that the shape of the waves is essentially the same in all three thickness combinations and the variation of the waveforms occurs at the outer boundary of the assembly. In the composite body, the particle velocity-time curves of all bilayer plates are basically the same.