Abstract In order to improve the combat effectiveness, stealth and safety of the marine structures, we design and fabricate the multilayer gradient composite lattice sandwich panels (MGCLSPs) to achieve excellent mechanical properties, vibration isolation characteristics and lightweight features of structures in the present study. The ideas of bionic gradients and material mixtures are incorporated in the design to improve the damping and vibration isolation behaviors of the MGCLSPs. The compression and hysteresis responses of the empty and polyurethane foam-filled MGCLSPs are investigated experimentally and numerically. It is found that the MGCLSPs have better energy absorption characteristics than the non-gradient panels, and the MGCLSP specimen D1 which is positive gradient absorbs the most energy. The experimental results also show that the addition of polyurethane foam can enhance the strength and energy absorption characteristics of MGCLSPs.

中文翻译：

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多层梯度复合点阵夹芯板的压缩和滞后响应

摘要 为了提高海洋结构物的战斗力、隐身性和安全性，本研究设计并制造了多层梯度复合点阵夹层板（MGCLSPs），以实现结构优异的力学性能、隔振特性和轻量化特性。设计中融入了仿生梯度和材料混合物的思想，以改善 MGCLSP 的阻尼和隔振行为。通过实验和数值研究了空的和聚氨酯泡沫填充的 MGCLSP 的压缩和滞后响应。发现MGCLSPs比非梯度板具有更好的能量吸收特性，并且正梯度的MGCLSP试样D1吸收的能量最多。