设计并制备了双向纤维腹板增强复合材料夹层梁,对其受弯性能进行了四点弯曲试验研究,开展单、双向格构夹层梁性能对比分析,研究不同腹板高度、厚度对夹层梁受弯性能的影响,基于经典夹层梁理论及简支梁受弯基本理论,研究夹层梁破坏模式和机理。试验结果表明：双向格构腹板增强形式能有效提高该夹层结构的极限变形能力与受弯极限承载力,且随着试件厚度加大提高作用更明显;保持夹层梁基本参数不变,增加试件高度有利于提高刚度,增强夹层梁极限承载力;单一增加腹板厚度有益于提高该夹层梁的极限变形能力,但不能明显提高其极限承载力。理论分析表明：采用铁木辛柯梁理论求得的挠度理论值与实验值吻合较好。
Two-way fiber reinforced sandwich beam was designed and fabricated by vacuum infusion molding process(VIMP).Flexural behavior of the beam was experimentally analyzed by the four-point bending test.Comparative analysis was made between the one-and two-way sandwich beams,and then the failure mode were observed from the test species with different webs height and web thickness.Based on the classic sandwich beam theory and the bending theory of simply supported beam,the ultimate bearing capacity and the failure mode of the sandwich composites beam were studied.It is concluded that the extreme deformation ability and the ultimate bearing capacity could be improved by the two-way lattice webs,while the improvement would become obvious with increasing sample thickness.Besides,both the stiffness and ultimate bearing capacity could also be effectively enhanced by increasing web height.Moreover,the extreme deformation could be improved by increasing web thickness,while the improvement of ultimate bearing capacity could hardly be observed.In addition,theoretical analysis indicates that deflection calculated by Timoshenko Beam Theory is in good accordance with the experiment.
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