Dynamic impact response of nanostructured and hybrid aluminum alloys

纳米结构和混合铝合金的动态冲击响应

• 批准号: RGPIN-2017-05751
• 负责人: Odeshi, Akindele
• 金额: $ 1.75万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638234
• 关键词: Dynamic; impact; response; nanostructured; hybrid

Aluminum alloys are choice materials for application in aerospace structures and as protective armor in military combat vehicles due to their low density and high specific strength. They offer unique advantages of weight reduction leading to fuel efficiency in aircraft and easy maneuverability in combat vehicles. In these applications, Al alloys must have good failure resistance to impact load, whether from bird strike for aircraft or projectiles in combat vehicles. When exposed to dynamic shock loading, intense strain localization culminating in development of adiabatic shear bands (ASBs) occurs in metallic alloys. This often triggers catastrophic failure. The ability of an alloy to withstand impact failure is determined by its resistance to formation of ASBs. Several high strength aluminum alloys fail catastrophically under dynamic impact loading due to their high susceptibility to formation of ASBs. With increasing incidences of bird strikes due to quieter engines in modern aircraft, and the need for improved lightweight protective armor, development of aluminum alloys with enhanced resistance to impact damage is inevitable.

铝合金具有密度低、比强度高的特点，是航空航天结构和军用战斗车辆防护装甲的首选材料。它们具有独特的重量减轻优势，从而提高飞机的燃油效率和战斗车辆的易操纵性。在这些应用中，铝合金必须具有良好的耐冲击载荷破坏性，无论是飞机的鸟撞还是战斗车辆的射弹。金属合金在动态冲击载荷作用下会发生强烈的应变局部化，最终形成绝热剪切带。这往往会引发灾难性的失败。合金承受冲击破坏的能力取决于其对ASB形成的抵抗力。几种高强度铝合金在动态冲击载荷下由于其对形成ASB的高敏感性而灾难性地失效。随着现代飞机中由于发动机更安静而导致的鸟撞发生率的增加以及对改进的轻质防护装甲的需求，具有增强的抗冲击损伤性的铝合金的开发是不可避免的。