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

Abstract

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

CLC Number:

V258
TB332

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

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