Kurzawa Adam, Pyka Dariusz, Jamroziak Krzysztof, Bajkowski Marcin, Bocian Miroslaw, Magier Mariusz, Koch Jan
Department of Lightweight Elements Engineering, Foundry and Automation, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, 50-370 Wroclaw, Poland.
Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, 50-370 Wroclaw, Poland.
Materials (Basel). 2020 Feb 7;13(3):769. doi: 10.3390/ma13030769.
The paper presents the results of studies on the effects of shooting composite materials produced by pressure infiltration with the EN AW-7075 alloy as a matrix and reinforcement in the form of preforms made of α-AlO particles. Composite materials were made with two reinforcement contents (i.e., 30% and 40% vol. of α-AlO particles). The composites produced in the form of 12 mm thick plates were subjected to impact loads from a 7.62 × 39 FMJ M43 projectile fired from a Kalashnikov. The samples of composites with different contents of strengthening particles were subjected to detailed microscopic examination to determine the mechanism of destruction. The effect of a projectile impact on the microstructure of the material within the perforation holes was identified. There were radial cracks found around the puncture holes and brittle fragmentation of the front surfaces of the specimens. The change in the volume of the reinforcement significantly affected the inlet, puncture and outlet diameters. The observations confirmed that brittle cracking dominated the destruction mechanism and the crack propagation front ran mainly in the matrix material and along the boundaries of the α-AlO particles. In turn, numerical tests were conducted to describe the physical phenomena occurring due to the erosion of a projectile hitting a composite casing. They were performed with the use of the ABAQUS program. Based on constitutive models, the material constants developed from the identification of material properties were modelled and the finite element was generated from homogenization in the form of a representative volume element (RVE). The results of microscopic investigations of the destruction mechanism and numerical investigations were combined. The conducted tests and analyses shed light on the application possibilities of aluminium composites reinforced with AlO particles in the construction of add-on-armour protective structures.
本文介绍了对以EN AW-7075合金为基体、α-AlO颗粒预制件为增强体通过压力浸渗法制备的复合材料进行射击效果研究的结果。制备了两种增强体含量（即α-AlO颗粒体积分数为30%和40%）的复合材料。以12毫米厚板材形式制备的复合材料受到来自卡拉什尼科夫冲锋枪发射的7.62×39 FMJ M43子弹的冲击载荷。对具有不同增强颗粒含量的复合材料样品进行了详细的微观检查，以确定破坏机制。确定了子弹冲击对穿孔孔内材料微观结构的影响。在穿孔孔周围发现了径向裂纹，并且试样前表面出现脆性破碎。增强体体积的变化显著影响了入口、穿孔和出口直径。观察结果证实，脆性开裂主导了破坏机制，裂纹扩展前沿主要在基体材料中并沿着α-AlO颗粒的边界延伸。此外，进行了数值试验，以描述由于子弹撞击复合外壳的侵蚀而发生的物理现象。这些试验是使用ABAQUS程序进行的。基于本构模型，对通过材料性能识别得出的材料常数进行建模，并通过以代表性体积单元（RVE）形式的均匀化生成有限元。将破坏机制的微观研究结果和数值研究结果相结合。所进行的试验和分析揭示了AlO颗粒增强铝基复合材料在附加装甲防护结构构建中的应用可能性。
