双向格构腹板增强泡沫夹层复合材料梁弯曲性能试验

复合材料夹层结构具有比强度高、比刚度高、可设计性强、耐腐蚀等特点,以聚氨酯泡沫为芯材,以玻璃纤维增强复合材料为面板和格构腹板,采用真空导入成型工艺,制备双向格构腹板增强泡沫夹层复合材料梁。对无格构泡沫夹芯复合材料梁,不同腹板高度、腹板间距双向格构增强泡沫夹层复合材料梁进行三点弯曲试验,研究其破坏模式和机理。基于泡沫填充矩形蜂窝芯材的等效十字模型,预估试件的抗弯刚度和挠度,计算值与试验值吻合较好。

EXPERIMENTAL INVESTIGATION ON FLEXURAL BEHAVIOR OF REINFORCED FOAM SANDWICH BEAMS WITH TWO-WAY LATTICE-WEB

Composite sandwich structure has the characteristics of high specific strength,high specific stiffness,good designability and corrosion resistance etc.Two-way lattice-web reinforced foam core sandwich beams are prepared through vacuum assisted resin infusion,with polyurethane foam as the core,Glass Fiber Reinforced Polymer (GFRP) as the panels and lattice webs.In order to study the failure mode and mechanism,a series of three point bending tests were performed on the common foam sandwich beams and the lattice-web reinforced foam sandwich beams with different web height and web space.Based on the equivalent cross model of foam filled with rectangular honeycomb shape,the bending stiffness and the deflection of the specimens are predicted,and the calculated values agree well with the experimental values.