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设计了一种新型整体缝合夹芯结构。采用真空导入模塑工艺(VIMP)制备整体缝合夹芯结构复合材料,研究其在平压载荷作用下的力学性能和破坏模式,建立其有限元模型,研究缝合纱线用量对整体缝合夹芯结构复合材料平压力学性能的影响。结果表明:该新型整体缝合夹芯结构复合材料能够在提高缝合纱线数量的同时避免一般斜缝方式引起纤维交叉损坏的弊端。整体缝合夹芯结构复合材料的压缩强度和压缩模量随着缝合纱线数量的增加而增大,但缝合纱线含量较高时,比压缩强度有所下降。数值计算结果与试验结果对比分析,验证了所建立有限元模型的合理性,说明该模型可用于预测其压缩模量。
A new type of monolithic suture sandwich structure was designed. The vacuum-insert molding process (VIMP) was used to fabricate the monolithic suture sandwich composite. The mechanical properties and failure modes of the monolithic suture sandwich composite were studied. The finite element model was established. Effect of Flat Pressure Mechanical Properties of Composites. The results show that the new monolithic suture sandwich composite can improve the number of stitching yarns and avoid the defects of cross-stitching caused by the common oblique stitching. The compressive strength and compressive modulus of the monolithic suture sandwich composite increase with the increase of the number of stitched yarns. However, the higher the stitching yarns, the lower the compressive strength. Comparing the numerical results with the experimental ones, the validity of the finite element model is verified, which shows that the model can be used to predict the compressive modulus.