S型碳纤维褶皱夹芯结构低速冲击响应特性实验研究  

Response characteristics of sandwich structure with S-shaped CFRP folded core under low velocity impact

作　　者：邓云飞[1] 周楠 田锐 魏刚[1] DENG Yunfei;ZHOU Nan;TIAN Rui;WEI Gang(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300

出　　处：《航空学报》2022年第6期462-473,共12页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(11702317);航空科学基金(201918067001);中央高校基本科研业务费中国民航大学专项资助(3122019092)。

摘　　要：为研究S型碳纤维褶皱夹芯结构在低速冲击下的力学响应特性,先以模压法制备了S型褶皱芯子,再通过二次胶接工艺对面-芯粘接固化获得S型碳纤维褶皱夹芯结构。使用直径为20 mm的柱形冲头预加载不同能量冲击结构的节点和基座位置,研究该结构两个典型位置在不同冲击能量下的损伤模式及响应特性。结果表明:不同冲击能量下,上面板损伤主要为纤维剪切断裂,芯层发生拉伸及压溃断裂,下面板主要发生纤维拉伸撕裂和基体开裂;相同冲击能量下,夹芯板节点冲击在损伤深度及载荷峰值方面表现出更优的抗冲击性能;从耗能角度看,高能冲击条件下节点冲击较基座冲击吸收更多能量。To study the mechanical response characteristics of the sandwich structure S-type CFRP folded core under low speed impact,the S-shaped folded core was prepared by the molding method,and then the sandwich structure with S-shaped CFRP folded core was obtained by face-to-core bonding and curing.The cylindrical punch with diameter 20 mm is preloaded with different energy to impact the node and base position of the structure,and the damage mode and response characteristics of the two typical positions of the structure under different impact energy are studied.The results show that fiber shear fracture is the main damage for the upper panel is,while tensile and crushing fracture for the core layer;fiber tensile tearing and matrix cracking are the main damages for the lower panel under different impact energy.Under the same impact energy,the node of sandwich panel shows better impact resistance in terms of damage depth and peak load.From the perspective of energy consumption,the node of sandwich panel absorbs more energy than the base under high energy impact.

关 键 词：复合材料 褶皱夹芯结构 冲击 失效机制 动态响应 

分 类 号：V258[一般工业技术—材料科学与工程]