Low-velocity impact performance of foam sandwich structure with plain weave panel after repair

doi:10.19936/j.cnki.2096-8000.20221128.008

Abstract

Abstract: A low-velocity impact test was carried out on the repaired plain woven foam sandwich panel to study the impact response parameters and damage mode of the repaired sandwich panel under the same impact energy and punch diameter, and the repaired sandwich panel was subjected to impact edgewise compression test to study the post-impact compressive strength, compressive modulus and residual compressive strength of sandwich panels after repair. The test results show that the maximum impact load of the test piece after repairing is generally larger. The maximum displacement of the punch is roughly the same under different repair conditions. The introduction of the repair additional layer reduces the depth of the pits caused by low-speed impact, and the drop in impact load is caused by the damage of the test piece. The damage pattern of the test piece after impact is basically the same, and the panel is mainly composed of delamination and resin matrix fragmentation. The fragmentation of the core material not only occurs at the impact site, but the core material outside the impact zone will also be broken due to uncoordinated deformation. After the test piece is subjected to low-velocity impact, the edgewise compressive strength and the remaining edgewise compressive strength percentage of the repaired piece are mostly higher than those of the unrepaired piece, but the edgewise compressive modulus is mostly lower than that of the unrepaired piece.

Key words: repair, foam sandwich, low-velocity impact, compression after impact, damage mode

CLC Number:

TB332

ZHOU Chun-ping, WANG Xuan, ZHANG Shi-qiu, GANG Qing-yong. Low-velocity impact performance of foam sandwich structure with plain weave panel after repair[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(11): 54-62.

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