The composite lattice sandwich structures with crushable foam core have exhibited outstanding potential in lightweight structures for underwater blast resistance. In this paper, the dynamic failure, energy absorption and associated mechanisms of the composite sandwich structures against the underwater impulsive loading are investigated experimentally and numerically. The underwater impulsive resistance of the composite lattice sandwich and the foam-reinforcement composite lattice sandwich are estimated by considering the varying impulsive intensities. With the reinforcement of the foam, the energy absorption capacity experiences a nearly 6 times of increase under the quasi-static compression. Although the influence on the deformed profile is limited, the effect of the impulsive intensity is fairly confirmed to have significant influences on the failure modes and energy absorption mechanisms of the sandwich structures. The impulsive resistance of the foam reinforced lattice sandwich structure is superior to the unreinforced counterpart in terms of the deflection resistance and structural integrity. The loading dispersion distribution, crushing, and cracking of the foam make the former optimize the energy absorption mechanism by highlighting the sacrifice of the front facesheet and decrease the back facesheet deflection. With the same areal mass with the lattice sandwich, the composite laminate exhibits inferior impulsive resistance to both the sandwich plates.

具有可压碎泡沫芯的复合晶格夹层结构在轻质结构中表现出出色的水下爆炸抗性潜力。在本文中，通过实验和数值研究了复合夹层结构抵抗水下冲击载荷的动态破坏、能量吸收和相关机制。通过考虑不同的冲击强度来估计复合晶格夹层和泡沫增强复合晶格夹层的水下冲击阻力。随着泡沫的增强，在准静态压缩下能量吸收能力增加了近6倍。虽然对变形轮廓的影响有限，相当证实脉冲强度的影响对夹层结构的破坏模式和能量吸收机制有显着影响。泡沫增强晶格夹层结构的抗冲击性在抗偏转性和结构完整性方面优于未增强的对应物。泡沫的负载分散分布、破碎和开裂使前者通过突出前面板的牺牲并减少后面板挠度来优化能量吸收机制。具有与晶格夹层相同的面积质量，复合层压板对两个夹层板表现出较差的抗冲击性。泡沫增强晶格夹层结构的抗冲击性在抗偏转性和结构完整性方面优于未增强的对应物。泡沫的负载分散分布、破碎和开裂使前者通过突出前面板的牺牲并减少后面板挠度来优化能量吸收机制。具有与晶格夹层相同的面积质量，复合层压板对两个夹层板表现出较差的抗冲击性。泡沫增强晶格夹层结构的抗冲击性在抗挠度和结构完整性方面优于未增强的对应物。泡沫的负载分散分布、破碎和开裂使前者通过突出前面板的牺牲并减少后面板挠度来优化能量吸收机制。具有与晶格夹层相同的面积质量，复合层压板对两个夹层板表现出较差的抗冲击性。泡沫的开裂使前者通过突出前面板的牺牲和减少后面板挠度来优化能量吸收机制。具有与晶格夹层相同的面积质量，复合层压板对两个夹层板表现出较差的抗冲击性。泡沫的开裂使前者通过突出前面板的牺牲和减少后面板挠度来优化能量吸收机制。具有与晶格夹层相同的面积质量，复合层压板对两个夹层板表现出较差的抗冲击性。