In order to investigate the anti-penetration performance and failure modes of aluminum foam sandwichstruc-ture under medium and high velocity bullet impact, we devised 4 kinds of target plates and carried out series ballistic tests on them. There are aluminum foam (I), front facet and aluminum foam (II), aluminum foam and back facet (III) and aluminum foam sandwich (IV). The experiments result indicated that the core foam failed in the mode of through-thickness shearing and tearing when the velocity impact is medium or high. With front facet plate, the aluminum core damaged with crushing. The failure mode of the front face sheet was shear plugging. Around the bullet hole, we can observed obvious discdeforma-tion when the velocity is low and lip of steel in the crevasse when the velocity is high. The back face sheet failed in local disc deformation-shear plugging and crevasse cracking occurred when the plate is thin. While shear plugging only occurred in the front face sheet under high velocity impact. The energy absorbed by aluminum foam plate is small while the energyab-sorbed by sandwich structure improved greatly. With face sheet, the target plate ability of anti-penetration enhance sharply. The front sheet had great influence on the anti-penetration performance than the back sheet. Every kind of sandwich anti-pen-etration performance under high velocity is significant improved than that performed under medium velocity.%为研究泡沫铝夹芯结构各组成部分在中、高速弹体侵彻下的抗侵彻性能及破坏机理,分别开展泡沫铝芯材(I)、前面板与芯材(II)、芯材与后面板(III)以及泡沫铝夹芯结构(IV)4种靶板在中、高速弹体侵彻下的弹道冲击试验.分析夹芯结构的破坏模式、侵彻过程和抗弹性能.结果表明:在中、高速弹体侵彻下,泡沫铝芯材发生了胞壁的绝热剪切和撕裂破坏,存在前面板的泡沫铝芯材还发生了胞壁压实坍塌;前面板发生绝热剪切破坏,弹速较低时,弹孔周围将产生明显的碟形弯曲变形,板厚较大、弹速较高时弹孔边缘存在开坑唇边;后面板发生了局部碟形弯曲-贯穿破坏,板厚较小时,后面板还产生了花瓣开裂.泡沫铝芯材吸能较小,泡沫铝和面板组成的夹芯结构吸能明显提高.面板的存在提高了靶板的抗弹性能,前面板对靶板的抗弹性能影响大于后面板的影响.同一种形式的靶板在高速弹体侵彻下的抗弹性能明显优于中速弹体侵彻下的抗弹性能.
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