低速冲击对K-cor夹层结构力学性能的影响

doi:10.7527/S1000-6893.2016.0166

材料工程与机械制造

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低速冲击对K-cor夹层结构力学性能的影响

沈裕峰, 李勇, 还大军, 王鑫

南京航空航天大学材料科学与技术学院, 南京 210016

收稿日期:2016-01-15 修回日期:2016-05-26 出版日期:2016-12-15 发布日期:2016-05-30
通讯作者: 李勇,Tel.:025-84892980,E-mail:lyong@nuaa.edu.cn E-mail:lyong@nuaa.edu.cn
作者简介:沈裕峰,男,硕士研究生。主要研究方向:复合材料三维增强。Tel.:025-84892980,E-mail:shenyf@163.com;李勇,男,博士,教授,博士生导师。主要研究方向:先进复合材料制造。Tel.:025-84892980,E-mail:lyong@nuaa.edu.cn
基金资助:
航空科学基金（2015ZE52049）；南京航空航天大学研究生创新基地开放基金（kfjj20150602）

Effect of low-velocity impact on mechanical properties of K-cor sandwich structure

SHEN Yufeng, LI Yong, HUAN Dajun, WANG Xin

College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2016-01-15 Revised:2016-05-26 Online:2016-12-15 Published:2016-05-30
Supported by:
Aeronautical Science Foundation of China (2015ZE52049); Project supported by the Foundation of Graduate Innovation Center in NUAA (kfjj20150602)

摘要/Abstract

摘要：

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。

关键词: K-cor夹层结构, Z-pin, 冲击损伤, 红外检测, 剩余压缩强度

Abstract:

K-cor sandwich structure is a new type of high-performance foam structure reinforced by Z-pinning techniques. By using drop hammer test, as well as infrared non-destructive testing and compression-after-impact (CAI) strength test, this paper studies the shock resistance of K-cor structure with changing parameters of Z-pin and core thickness under low velocity impact. Experimental results indicate that the thicker the core is, the larger the impact damage area is, and the higher the compression strength retention is. When the increase of the bending length of Z-pin is not more than the implanted spacing, the impacted damage area of K-cor structure can be significantly reduced, and the compression-after-impact strength can be enhanced. When the density of the core is the same, improving the bending length of Z-pin, rather than the implanted density, can reduce the damage area and increase the ratio of compression-after-impact strength to strength retention of the sample.

Key words: K-cor sandwich structure, Z-pin, impact damage, infrared testing, residual compression strength

中图分类号:

V258
TB332

沈裕峰, 李勇, 还大军, 王鑫. 低速冲击对K-cor夹层结构力学性能的影响[J]. 航空学报, 2016, 37(12): 3853-3863.

SHEN Yufeng, LI Yong, HUAN Dajun, WANG Xin. Effect of low-velocity impact on mechanical properties of K-cor sandwich structure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(12): 3853-3863.

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E-mail：hkxb@buaa.edu.cn

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低速冲击对K-cor夹层结构力学性能的影响

Effect of low-velocity impact on mechanical properties of K-cor sandwich structure

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