The composite sandwich structures with foam core and fiber-reinforced polymer skin are prone to damage under local impact. The mechanical behavior of sandwich panels (glass fiber-reinforced polymer [GFRP] skin reinforced with lattice webs and syntactic foams core) is studied under crushing load. The crushing behavior, failure modes, and energy absorption are correlated with the number of GFRP layers in facesheets and webs, fiber volume fractions of facesheets in both longitudinal and transverse directions, and density and thickness of syntactic foam. The test results revealed that increasing the number of FRP layers of lattice webs was an effective way to enhance the energy absorption of sandwich panels without remarkable increase in the peak load. Moreover, a three-dimensional finite-element (FE) model was developed to simulate the mechanical behavior of the syntactic foam sandwich panels, and the numerical results were compared with the experimental results. Then, the verified FE model was applied to conduct extensive parametric studies. Finally, based on experimental and numerical results, the optimal design of syntactic foam sandwich structures as energy absorption members was obtained. This study provides theoretical basis and design reference of a novel syntactic foam sandwich structure for applications in bridge decks, ship decks, carriages, airframes, wall panels, anticollision guard rails and bumpers, and railway sleepers. Graphical abstract

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具有格子腹板的复合泡沫夹芯板在挤压载荷下的行为的实验和建模研究

具有泡沫芯和纤维增强聚合物表层的复合夹层结构在局部冲击下容易损坏。夹心板（玻璃纤维增​​强聚合物 [GFRP] 表皮用格子网和复合泡沫芯增强）在压碎载荷下的力学行为进行了研究。破碎行为、破坏模式和能量吸收与面板和腹板中的 GFRP 层数、面板在纵向和横向上的纤维体积分数以及复合泡沫的密度和厚度相关。试验结果表明，在不显着增加峰值载荷的情况下，增加格子腹板的 FRP 层数是增强夹层板能量吸收的有效方法。而且，开发了三维有限元 (FE) 模型来模拟复合泡沫夹芯板的力学行为，并将数值结果与实验结果进行比较。然后，应用经过验证的有限元模型进行广泛的参数研究。最后，基于实验和数值结果，得到复合泡沫夹层结构作为吸能构件的优化设计。本研究为一种新型复合泡沫夹层结构应用于桥面、船舶甲板、车厢、机身、墙板、防撞护栏和保险杠、铁路枕木等提供了理论依据和设计参考。图形概要 经验证的有限元模型用于进行广泛的参数研究。最后，基于实验和数值结果，得到复合泡沫夹层结构作为吸能构件的优化设计。本研究为一种新型复合泡沫夹层结构应用于桥面、船舶甲板、车厢、机身、墙板、防撞护栏和保险杠、铁路枕木等提供了理论依据和设计参考。图形概要 经验证的有限元模型用于进行广泛的参数研究。最后，基于实验和数值结果，得到复合泡沫夹层结构作为吸能构件的优化设计。本研究为一种新型复合泡沫夹层结构应用于桥面、船舶甲板、车厢、机身、墙板、防撞护栏和保险杠、铁路枕木等提供了理论依据和设计参考。图形概要 机身、墙板、防撞护栏和保险杠，以及铁路枕木。图形概要 机身、墙板、防撞护栏和保险杠，以及铁路枕木。图形概要