论文部分内容阅读
K-cor夹层结构是应用Z-pin技术增强的一种新型高性能夹层结构,本文基于落锤冲击实验对低速冲击下K-cor夹层结构的力学性能进行了研究,结合红外无损检测和冲击后压缩强度(CAI)试验,对不同Z-pin植入参数和芯材厚度对K-cor试样的冲击损伤阻抗进行了深入研究。研究结果表明:K-cor夹层结构的芯材越厚,则其冲击损伤面积越大,但剩余压缩强度比越高;在不超过植入间距的前提下,增加Z-pin的折弯长度能显著的降低K-cor结构冲击后的损伤面积,提高压缩强度;在相同芯材密度的情况下,提高Z-pin的折弯长度比增大植入密度更有利于减少K-cor试样冲击后的损伤面积,提高试样的压缩强度和其剩余压缩强度比。
The K-cor sandwich structure is a new type of high-performance sandwich structure reinforced by Z-pin technology. In this paper, the mechanical properties of K-cor sandwich structure under low velocity impact are studied based on drop weight impact test. Combining with infrared nondestructive testing and impact Compressive strength (CAI) test, the impact damage resistance of K-cor samples with different Z-pin implantation parameters and core thickness was studied in depth. The results show that the thicker the core of K-cor sandwich structure, the larger the impact damage area, but the higher the residual compressive strength ratio; under the premise of not exceeding the implant spacing, increasing the bending length of the Z-pin Significantly reduces the damage area after impact of K-cor structure and increases the compressive strength; it is more advantageous to increase the bending length of the Z-pin than to increase the implant density at the same core density to reduce the K-cor sample impact After the damage area, improve the compressive strength of the sample and its residual compressive strength ratio.