Flexural property evaluation of web reinforced GFRP-PET foam sandwich panel: Experimental study and numerical simulation
Flexural property evaluation of web reinforced GFRP-PET foam sandwich panel: Experimental study and numerical simulation
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DOI：
10.1016/j.compositesb.2022.109725
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发表时间：
2022-02-12
影响因子：
13.1
通讯作者：
Cai, Wei
中科院分区：
文献类型：
--
作者：
Xie, Honglei;Shen, Chunyan;Cai, Wei
这项工作重点研究聚对苯二甲酸乙二醇酯（PET）泡沫填充格子复合夹芯板在四点弯曲（FPB）下的弯曲性能。分析了不同面板和芯材厚度对夹芯板弯曲性能的影响。实验结果表明，玻璃纤维增强聚合物（GFRP）腹板可以有效防止夹芯结构发生灾难性破坏，结构的破坏模式主要是泡沫剪切、顶面板压缩和顶面板-芯材脱粘。增加面板和PET泡沫厚度可以有效提高面板的极限载荷，分别达88.9%和115.6%。采用分析模型来准确预测结构的弯曲刚度、极限载荷和失效模式。弯曲刚度和极限载荷的理论预测与实验结果误差在10%以内。此外，建立了3D数值模型来了解结构的失效模式和响应，通过VUMAT子程序将PET泡沫的连续损伤材料模型导入ABAQUS软件，并对GFRP采用Hashin失效准则。模拟的失效模式和载荷-位移曲线与实验结果非常吻合。
This work focus on the flexural property of polyethylene terephthalate (PET) foam-filled lattice composite sandwich panels subjected to four-point bending (FPB). The effects of different face sheet and core thicknesses on the flexural properties of the sandwich panels were analyzed. Experimental results indicated that the glass fiber reinforced polymer (GFRP) webs can effectively prevent the sandwiches from catastrophic failure, the failure modes of the structures are dominated by foam shear, top face sheet compressive, and top face sheet-core debonding. Increasing the face sheet and PET foam thickness can effectively improve the ultimate load of the panels by 88.9% and 115.6%, respectively. An analytical model was employed to accurately predict the bending stiffness, ultimate load, and failure modes of the structures. The errors between theoretical predicted and experimental results are within 10% in terms of bending stiffness and ultimate load. Furthermore, a 3D numerical model was built to understand the failure modes and responses of the structures, a continuum damage material model for PET foam was imported into ABAQUS software by VUMAT subroutine, and Hashin failure criterion was used for GFRP. The simulated failure modes and load-displacement curves were in good agreement with experimental results.