(1.中南大学 材料科学与工程系， 长沙 410083;
2.中国船舶工业公司 710研究所， 宜昌 443003)
摘 要: 以挤压及热处理(T6态)工艺制备6066铝合金圆管型模拟炸弹，进行了力学性能测试、砂坑中爆破试验及扫描电镜断口形貌观察。研究结果表明：随着应变速率的提高，6066铝合金强度升高，塑性下降，断口从韧性向脆性转变。爆破破片断口形貌由拉伸断裂、剪切断裂及其过渡区组成，但以拉伸断裂为主。6066铝合金作为弹体材料密度小、装药量大、爆轰力大，故而破片率及破片初速大，杀伤力大。通过破片的断裂特征，分析了与材料动态断裂行为相关的形貌特征，研究了该弹体材料的膨胀断裂行为。
关键字: 6066铝合金；破片机理；力学性能
alloy bomb casings
（1.Department of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2.China Ship Industry Corporation, Yichang 443003, China）
Abstract:Tubular bomb casings of 6066 aluminum alloy were manufactured by extrusion and T6 heat-treatment. The strength of 6066 aluminum alloy was increased and the ductility was decreased with the increase of strain rate. The fracture behavior was investigated in consideration of fragment rate. The result shows that shear deformation occurs at the interior surface of the casing and tensile deformation at the outer surface under high explosive detonation pressure. Expansion and fracture of explosive-filled 6066 aluminum alloy cylinders were analyzed. The relations between material characters combining with loading-strength and deformation character were also discussed.
Key words: 6066 aluminum alloy; fracture behavior; mechanical property
