整体缝合夹芯结构复合材料压缩性能

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。 

Compression performance of integrated stitched sandwich structure composites

New type of integrated stitch sandwich structure was designed.The integrated stitched sandwich struc-ture composites were prepared by vacuum infusion molding process (VIMP)to investigate the mechanical perform-ance and failure mode under the flatwise compression load.Finite element model was established to study the effects of the stitching yarn consumption on flatwise compression mechanical properties of integrated stitched sandwich structure composites.The results indicate that the new type of integrated stitch sandwich structure composites can improve the number of yarns and avoid the disadvantages of fiber cross damage caused by the traditional angled stitched.The compression strength and compression modulus of integrated stitched sandwich structure composites increase with the increase of the number of stitching yarn.However the specific compression strength will decrease when the number of stitching yarn is high.The rationality of the established finite element model is validated by comparing with numerical calculation results and test results.It indicates that the model could be used to predict the compression modulus.