缝合复合材料层板面内边缘冲击及冲击后压缩实验  

Experimental Investigation of Stitched Composite Laminates Subjected to In-plane Edge Impact and Compression After Impact

作　　者：李美艳 赖家美[1] 莫明智 罗志强 黄志超 LI Meiyan;LAI Jiamei;MO Mingzhi;LUO Zhiqiang;HUANG Zhichao(Polymer Processing Research Laboratory,School of Mechanical and Electric Engineering,Nanchang University,Nanchang 330031,China;Key Laboratory for Conveyance and Equipment of the Ministry of Education,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]南昌大学机电工程学院聚合物成型研究室,南昌330031 [2]华东交通大学载运工具与装备教育部重点实验室,南昌330013

出　　处：《材料导报》2022年第23期223-228,共6页Materials Reports

基　　金：国家自然科学基金(51763016,51875201);江西省研究生创新专项资金(YC2020-S090)。

摘　　要：利用真空辅助树脂传递成型(VARTM)技术制备缝合/未缝合碳纤维层板,并分别对其进行了五种不同能量的面内边缘冲击及冲击后压缩实验,结构内部的冲击损伤通过超声C扫描检测技术进行观测。结果表明:缝合工艺的引入能有效提高碳纤维层板的面内冲击阻抗及损伤容限,在五种能量范围内,冲击峰值力的增幅达到4.54%~10.33%,冲击后剩余压缩强度的增幅最高达到9.32%;另外,通过超声C扫描检测结果发现,面内边缘冲击后,在复合材料面板上的冲击点附近会出现一个半椭圆形的分层区域,且缝合层板的分层损伤面积明显小于未缝合层板;未缝合层板面内边缘冲击后压缩的主要破坏模式为分层扩展,而缝合层板面内边缘冲击后的压缩失效模式为整体屈曲。Stitched and unstitched carbon fiber reinforcedplastic(CFRP) laminates were manufactured by the vacuum assisted resin transfer molding(VARTM) technique and subjected to in-plane edge impact and compression after impact under five different energies. The damage after edge impact inside the structure was detected by the ultrasonic C-scan method. The experimental results show that stitching can improve the edge-impact resistance and damage tolerance of the laminates effectively. Within the impact energy range tested, the peak impact force increased by 4.54%~10.33% and the maximum increase of the residual compressive strength after impact was 9.32%. In addition, through the result from ultrasonic C-scan, it is found that there was a semi-elliptical delaminated damage area near the impact edge on the composite plates after in-plane edge impact of the structures, and the damage area of the stitched laminates was significantly smaller than that of unstitched. The main compression failure mode after in-plane edge impact of the unstitched laminates was delamination propagation, while the stitched laminates was global buckling.

关 键 词：缝合 面内边缘冲击 冲击后压缩 超声C扫描 

分 类 号：TB332[一般工业技术—材料科学与工程]