Low-velocity impact responses and CAI properties of synthetic foam sandwiches
Low-velocity impact responses and CAI properties of synthetic foam sandwiches
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合成泡沫夹层材料的低速冲击响应和 CAI 特性
DOI：
10.1016/j.compstruct.2019.04.045
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发表时间：
2019
影响因子：
6.3
通讯作者：
Jiye Chen
中科院分区：
文献类型：
--
作者：
Jun Wang;Jing Li;Hota GangaRao;Ruifeng Liang;Jiye Chen
本文对玻璃纤维增强聚合物（GFRP）蒙皮和合成泡沫芯材夹层结构在低速冲击下的冲击和冲击后压缩（CAI）响应进行了实验和分析研究。冲击试验结果表明，复合泡沫玻璃钢板的侵彻深度远小于未复合泡沫玻璃钢板。侧压试验结果表明，无格构腹板夹芯板的破坏模式主要为面板剥离，而格构腹板夹芯板的破坏模式主要为面板的起皱、分层和泡沫芯材的破碎。本文讨论了冲击能量、玻璃钢铺层、合成泡沫塑料密度和腹板的存在对夹层板冲击和冲击后性能的影响。利用能量原理和应用力学中的变分方法，提出了网格腹板夹芯板冲击后剩余极限侧压承载力的分析模型。冲击损伤，局部屈曲的面板和泡沫芯的约束强度的影响进行了测量和比较，以及与建议的分析模型。
This paper presents experimental and analytical studies on impact and compression after impact (CAI) responses of sandwiches with glass fiber reinforced polymer (GFRP) skins and synthetic foam cores under low-velocity impacting. The impact test results showed that the penetration depth of GFRP panels with synthetic foam is much smaller than that of bare synthetic foam panels. The edgewise compression test results indicated the facesheet debonding dominates the failure mode of the sandwich panels without lattice webs, while the failure mode of the sandwich panels with lattice webs is predominated by the wrinkling and delamination of the facesheets and the crushing of foam core. The influences of applied impact energy, GFRP lay-up, synthetic foam density and the existence of webs on the impact and post impact behavior of sandwich panels are discussed herein. Analytical models are proposed to predict the residual ultimate edgewise compressive load capacity of sandwich panels with lattice webs after impacts, using energy principles and variational methods in applied mechanics. The influences from impact damage, the local buckling of the facesheets and the confined strength of the foam core are measured and compared well with proposed analytical models.