缝合增强泡沫夹芯结构复合材料的制备与性能  

Fabrication and Properties of Stitching Reinforced Foam Sandwich Composites

作　　者：杨金水[1] 梁威[2] 曾竟成[1] 尹昌平[1] YANG Jinshui;LIANG Wei;ZENG Jingcheng;YIN Changping(Department of Materials Science and Engineering,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073;Northwest Institute of Nuclear Technology,Xi'an 710024)

机构地区：[1]国防科技大学空天科学学院材料科学与工程系,长沙410073 [2]西北核技术研究所,西安710024

出　　处：《纤维复合材料》2020年第4期43-50,共8页Fiber Composites

摘　　要：为满足夹芯结构复合材料耐压和轻量化的要求,采用真空导入模塑工艺一体成型缝合增强泡沫夹芯结构复合材料,考察了缝合间距、缝合纤维柱直径对夹芯结构复合材料性能的影响。结果表明:缝合纤维柱的纤维体积分数控制在45%~47%范围内时,真空导入模塑工艺制备的缝合增强泡沫夹芯结构复合材料树脂浸润缝合纤维柱质量均匀,缺陷最少。缝合间距增加1倍,平压模量降低65.7%,平压强度降低54.3%;缝合纤维柱直径增加,平压模量和平压强度显著增加,且平压模量大致与纤维柱直径的平方成正相关关系。缝合增强后,夹芯结构平压模量最大增加了9.2倍,平压强度增加了3.9倍。缝合增强泡沫夹芯结构的失效依赖于缝合增强方式,主要有泡沫开裂失效和纤维柱失效两种失效模式。In order to meet the requirements of pressure resistance and lightweight,this paper carried out the research on the preparation and flat compression performance of stitch-reinforced foam sandwich composite materials.The stitch-reinforced foam sandwich composite materials are prepared by vacuum infusion molding process to investigate the effect of stitching distance,stitched fiber-column diameter and foam density on the properties of the sandwich structure composites.The results show that when the fiber volume fraction of the stitched fiber-column in the range of 45%-47%,the resin is well infiltrated with the fibers in the foam pores with the least defects when the stitch-reinforced foam sandwich composite materials prepared by vacuum infusion molding process.The flat compressive modulus and strength of the stitched sandwich composite reduced by 65.7% and 54.3% respectively,as the suture spacing is doubled.The flat-compressive modulus and the flat-compressive strength of the increase significantly with the increasing of the stitched fiber-column diameter,and the flat-compressive modulus positively correlated with the square of the fiber-column diameter.After the stitching is strengthened,the maximum flatcompressive modulus is increased by 9.2 times,and the maximum flat-compressive strength is increased by 3.9 times,after stitched reinforcement The failure of stitch-reinforced foam sandwich structure depends on the stitching method,which is mainly consists of two failure modes:Foam cracking failure and fiber-column failure.

关 键 词：复合材料 缝合增强 泡沫夹芯结构 平压性能 

分 类 号：TB33[一般工业技术—材料科学与工程]