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提出了一种齿板-玻璃纤维混合面板和泡沫芯材组成的新型混合夹层结构,齿板通过齿钉与泡沫芯材相连。该结构采用真空导入成型工艺制备,通过三点弯曲试验研究该结构在不同跨度、芯材密度情况下的破坏模式和弯曲性能,并与普通泡沫夹层结构进行对比分析,同时探究了齿板对该结构界面性能的影响。结果表明:在泡沫芯材密度为35、80、150 kg/m3情况下,齿板-玻璃纤维混合泡沫夹层梁弯曲承载能力与普通泡沫夹层梁相比分别提高了168%、211%、258%,其界面剪切强度依次为0.09、0.21、0.45MPa;随着芯材密度、跨度的变化,该结构主要发生芯材剪切和芯材凹陷两种破坏形态,齿板的嵌入有效抑制界面的剪切失效。另外,利用理论公式估算了试件受弯极限承载能力,理论值与实测值吻合较好.
A new hybrid sandwich structure consisting of a tooth plate, a glass fiber hybrid panel and a foam core is proposed. The tooth plate is connected to the foam core by means of a tooth nail. The structure was prepared by vacuum induction molding process. The failure mode and bending performance of the structure under different span and core density were studied by three-point bending test. The structure of the sandwich was compared with the ordinary foam sandwich structure. Meanwhile, Effect of structural interface properties. The results show that the flexural bearing capacity of tooth plate - glass fiber composite foam sandwich beam increases by 168%, 211% and 258% respectively compared with that of ordinary foam sandwich beam with the foam core density of 35,80,150 kg / m3. , The interfacial shear strength is 0.09,0.21,0.45MPa; With the changes of the density and span of the core material, the core material shear and the core material sag are two kinds of failure modes. The insertion of the tooth plate can effectively suppress the interface Shear failure. In addition, the ultimate bearing capacity of specimens is estimated by theoretical formula, and the theoretical value is in good agreement with the measured value.