The paper presents the method of analysis and a comparison of the effectiveness of modified and conventional syntactic foams. The method employs the two-phase superposition approach recently developed for composite materials consisting of several concentric phases. Conventional syntactic foams consisting of spherical voids surrounded by thin glass shells embedded in the matrix are compared to modified foams with cylindrical or spheroidal voids. Modified syntactic foams analyzed in the paper include foams with cylindrical voids aligned along the applied stress or perpendicular to the stress and foams with randomly oriented cylindrical voids. It is demonstrated that while conventional syntactic foams with spherical voids absorb more energy than their modified counterparts, the stiffness of such foams is compromised due to the presence of voids to a larger degree than in modified foams. Accordingly, modified syntactic foams may appear a better compromise if a high energy absorption has to be combined with a prescribed large stiffness of the material.

本文介绍了分析方法，并比较了改性和传统复合泡沫的有效性。该方法采用了最近为由几个同心相组成的复合材料开发的两相叠加方法。由嵌入基质中的薄玻璃壳包围的球形空隙组成的传统复合泡沫与具有圆柱形或球形空隙的改性泡沫进行了比较。论文中分析的改性复合泡沫包括具有沿施加的应力排列或垂直于应力排列的圆柱形空隙的泡沫和具有随机取向的圆柱形空隙的泡沫。结果表明，虽然具有球形空隙的传统复合泡沫比其改性对应物吸收更多的能量，由于存在比改性泡沫更大程度的空隙，这种泡沫的刚度受到损害。因此，如果必须将高能量吸收与规定的大刚度材料相结合，则改性复合泡沫可能会出现更好的折衷方案。