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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Two Different Dynamic Loading Conditions on Spall and Damage of 7075 Aluminum Alloy
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Effects of Two Different Dynamic Loading Conditions on Spall and Damage of 7075 Aluminum Alloy

机译：两种不同动态载荷条件对7075铝合金剥落和损伤的影响

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摘要

The fracture behaviors of the 7075 aluminum alloy under two different dynamic loading conditions are investigated by means of a light-gas gun. The fracture surfaces obtained in the spall test are compared to the fracture surfaces obtained with a blunt projectile struck to the aluminum alloy plate. Optical and scanning electron microscopes are used in the investigation. For the plate-impact test, spall of the target was attributed to intergranular fracture caused by the tensile stress. The fracture behavior during projectile penetration is complex and consists of several fracture modes in addition to that the fracture is also of dynamic character. The penetration process of aluminum alloy target included: plugging stage, the microcracks nucleation stage, and the final tensile fracture stage. Mixed intergranular brittle/ductile fracture was observed, and brittle fracture played a dominate role.
机译：用轻气枪研究了7075铝合金在两种不同动态载荷条件下的断裂行为。将在剥落测试中获得的断裂表面与撞击到铝合金板上的钝弹丸获得的断裂表面进行比较。光学和扫描电子显微镜用于研究。对于板冲击试验，靶的剥落归因于由拉伸应力引起的晶间断裂。弹丸穿透过程中的断裂行为很复杂，除了具有动态特性外，还包括几种断裂模式。铝合金靶的穿透过程包括：堵塞阶段，微裂纹成核阶段和最终拉伸断裂阶段。观察到混合的晶间脆性/延性断裂，脆性断裂起主要作用。

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