Structural evaluation of scaled double-layered containment structure against rigid missile impact

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

Abstract

In this experimental study, the scaled double-layer containment structure represented by 1000 mm × 1000 mm targets of outer reinforced and inner prestressed concrete of thickness 200 mm has been subjected to ballistic impact by 10 and 20 kg rigid missiles at incidence velocities, close to 100 m/s. The inner layer of prestressed concrete was cast with and without a monolithic rear steel liner of thickness 1.5 mm. The prestressing force was induced in the vertical and horizontal directions with respect to 15 % of the characteristic compressive strength of concrete (M45). In double-layer tests, the 20 kg missiles perforated the outer layer target with significant residual velocities, while the 10 kg missile just perforated the outer layer. The 20 kg missile, when impacted the inner layer prestressed concrete target with a rear steel liner, experienced no damage. However, when impacted, the prestressed concrete target without a rear steel liner suffered significant rear surface cracking but no scabbing of concrete. This concludes that steel liner plays a substantial role in mitigating rear surface cracking and minimizing damage to the inner layer target. The ballistic tests were also performed on single independent prestressed concrete targets with and without steel liner against 20 kg missiles. In single-layer tests, the target with the rear surface steel liner restricted the perforation phenomena, however, significant damage occurred to the concrete and the steel liner. On the other hand, the target without a steel liner underwent complete failure through perforation. Hence, steel liners not only controlled the rear surface cracking (in double-layer) but also effectively controlled the perforation phenomena (in single-layer). No loss of prestressing force was observed in the case of the double-layered configuration, however, when the missile impacted the single-layered prestressed concrete target, a noticeable loss of prestressing force was observed. The perforation limit velocities calculated using Modified NDRC, BRL-NDRC, CEA-EDF, UMIST, and Modified UMIST empirical models for reinforced and prestressed concrete targets were compared with the experimental results.

按比例双层安全壳结构抗刚性导弹撞击的结构评估
在这项实验研究中,外层钢筋混凝土和内层厚度为 200 毫米的预应力混凝土构成的 1000 毫米×1000 毫米靶标所代表的按比例双层安全壳结构,在接近 100 米/秒的入射速度下,分别受到 10 公斤和 20 公斤硬质导弹的弹道冲击。内层预应力混凝土在浇注时,有无厚度为 1.5 毫米的整体后部钢衬垫。在垂直和水平方向上施加的预应力为混凝土特性抗压强度(M45)的 15%。在双层试验中,20 千克导弹以很大的残余速度击穿了外层目标,而 10 千克导弹只是击穿了外层。20 千克导弹在撞击内层带后部钢衬里的预应力混凝土靶时,未造成任何破坏。然而,没有后部钢衬里的预应力混凝土目标在受到撞击时,其后部表面出现明显开裂,但混凝土没有结痂。由此得出结论,钢衬里在减轻后表面开裂和最大限度地减少对内层目标的损坏方面发挥了重要作用。此外,还对带和不带钢衬里的单层独立预应力混凝土目标进行了 20 公斤导弹的弹道测试。在单层试验中,带后表面钢衬里的靶限制了穿孔现象,但混凝土和钢衬里受到了严重破坏。另一方面,没有钢衬的靶子则因穿孔而完全失效。因此,钢衬不仅控制了后表面开裂(双层),还有效地控制了穿孔现象(单层)。在双层结构中没有观察到预紧力的损失,但当导弹撞击单层预应力混凝土目标时,观察到了预紧力的明显损失。使用修正的 NDRC、BRL-NDRC、CEA-EDF、UMIST 和修正的 UMIST 经验模型计算出的钢筋混凝土和预应力混凝土目标的穿孔极限速度与实验结果进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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