缝合泡沫复合材料弯曲性能研究

Study on the Flexural Behavior of Stitched Foam-core Sandwich Panels

利用Abaqus分析平台建立了缝合泡沫夹层结构在三点弯曲载荷下的动力学有限元模型,通过杆单元模型模拟缝线树脂柱的受力情况,基于hashin破坏准则考量了面内纤维断裂、基体压溃等损伤情况。对缝合泡沫复合结构和未缝合泡沫复合结构进行了三点弯曲实验,其中缝合泡沫复合结构最大弯曲载荷提高80%左右,弯曲挠度提高30%左右,说明缝线树脂柱的引入可以有效提高缝合泡沫夹层结构的弯曲性能,而模拟得到的实验数据相较真实数据的误差都控制在10%以内,证明了模型的可靠性,利用hashin准则下纤维压缩损伤情况(HSNFCCRT)和hashin准则下基体拉伸损伤情况(HSNMTCRT)的输出证明缝线树脂柱的加入有效地减少了纤维面板内部的层间损伤,表明其面内性能得到了明显的提高。

The paper aims at predicting the flexural behavior of through-thickness stitched sandwich panels composed of foam core and glass fiber face sheets.A dynamics finite element model was established for the stitched foam core sandwich composite laminate under bending load.We find that the maximum flexural load of the stitched foam sandwich panels increased by about 80%and the flexural deflection increased by about 30%,which indicates that the introduction of stitched resin columns can effectively improve the flexural behavior of the stitched foam sandwich panels,and the experimental data obtained from the simulation have controlled errors within 10%compared to experiment datas.And the output of HSNFCCRT and HSNMTCRT proves that the addition of stitched resin columns effectively reduces the interlayer damage inside the fiber pa-nels,indicating that its in-plane performance has been significantly improved.