Al matrix syntactic foams have been widely studied as impact protection materials. The impact behaviour of syntactic foams, especially for non-homogeneous structures, however, is not well understood. The impact response of Al matrix syntactic foams with both homogeneous and layered structures were studied experimentally and theoretically. Layered structures composed of large- and small-particle layers provided lower impact peak stress and higher ductility than the average values of the large- and small-particle layers. The energy absorption capacity of the layered structures is the sum of the energy absorption capacities of the constituent layers. An analytical model for stress and strain evolutions in Al matrix syntactic foams during impact was developed. The contact stress, inertia stress and base as a function of time was calculated as a function of impact velocity. The analytical model captures the key characteristics of stress fluctuation during impact. The predictions of the base stress agreed reasonably well with the experimental results, showing stress fluctuation with similar time interval and amplitude.

铝基复合泡沫已被广泛研究作为冲击防护材料。然而，对于结构泡沫的冲击行为，特别是对于非均质结构的冲击行为，还没有很好的了解。通过实验和理论研究了具有均质和层状结构的Al基复合泡沫的冲击响应。与大颗粒层和小颗粒层的平均值相比，由大颗粒层和小颗粒层组成的分层结构提供了更低的冲击峰值应力和更高的延展性。层状结构的能量吸收能力是构成层的能量吸收能力的总和。建立了铝基复合泡沫在冲击过程中应力和应变演变的分析模型。接触应力 惯性应力和基础随时间的变化被计算为冲击速度的函数。该分析模型捕获了冲击过程中应力波动的关键特征。基本应力的预测与实验结果吻合得很好，显示出应力波动在相同的时间间隔和幅度下均发生。