In this research, a multi-layered composite armor was introduced by combining ceramics, fiber-reinforced composite and metal alloy with the aim of making the armor capable of resisting ballistic impact. A model was developed in ABAQUS/Explicit to predict the impact performance of armor in different scenarios. A thinner version of the proposed structure was manufactured, and experiments were conducted. Data were collected and analyzed including initial and residual velocity and absorbed kinetic energy. The experiments and simulations showed similarities in how the materials response to the ballistic impact. It was found that the thickness of each component contributes to the total ballistic resistance of the whole structure. By putting 20 mm thick Boron carbide layer in front layer, armor structure can absorb more kinetic energy than having 10 mm thick Boron carbide front layer. The sequence order of layers also affected the protection of armor structure. If the front layer is Kevlar/epoxy, armor structure cannot withstand multi-hit attacks because of significant delamination in these layers. Also, the Boron carbide core that had Kevlar/epoxy layer in the front was more shattered than the Boron carbide front layer that had Kevlar/epoxy as the core layer. By applying cohesive layers between Kevlar/epoxy layers, the displacement of fibers in the bonded composite layers was equal to 68% of the displacement of fibers in the unbonded Kevlar/epoxy layers. Also, the multi-layer structure with bonded Kevlar/epoxy layers exerted more stress on projectile after impact compared to structure with unbonded Kevlar/epoxy layers.

中文翻译：

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多层装甲结构弹道冲击行为研究

在这项研究中，通过将陶瓷、纤维增强复合材料和金属合金相结合，引入了多层复合装甲，旨在使装甲能够抵抗弹道冲击。在 ABAQUS/Explicit 中开发了一个模型来预测装甲在不同情况下的冲击性能。制造了所提出的结构的更薄版本，并进行了实验。收集并分析数据，包括初始速度和剩余速度以及吸收的动能。实验和模拟显示了材料对弹道冲击的响应方式的相似性。研究发现，每个部件的厚度都会影响整个结构的总防弹性能。通过在前层放置20毫米厚的碳化硼层，装甲结构可以比具有10毫米厚的碳化硼前层吸收更多的动能。各层的顺序也影响装甲结构的防护。如果前层是凯夫拉尔/环氧树脂，则装甲结构无法承受多次攻击，因为这些层中存在明显的分层。而且，前面具有凯夫拉尔/环氧树脂层的碳化硼芯比具有凯夫拉尔/环氧树脂作为芯层的碳化硼前层更破碎。通过在 Kevlar/环氧树脂层之间施加粘合层，粘合复合材料层中的纤维位移等于未粘合 Kevlar/环氧树脂层中纤维位移的 68%。此外，与具有未粘合凯夫拉尔/环氧树脂层的结构相比，具有粘合凯夫拉尔/环氧树脂层的多层结构在撞击后对射弹施加了更大的应力。