激光诱导冲击波加载下铝合金弯曲变形规律与表面特性研究  

Bending Deformation and Surface Characteristics of 2024 Aluminum Alloy Processed by Laser-Induced Shock Wave

作　　者：曹子文[1] 邹世坤[1] 车志刚[1] 

机构地区：[1]北京航空制造工程研究所高能束流加工技术重点实验室,北京100024

出　　处：《激光与光电子学进展》2015年第12期124-128,共5页Laser & Optoelectronics Progress

摘　　要：利用纳秒脉冲激光诱导冲击波对2024铝合金试片进行单面冲击成形实验,分析了冲击成形试片的弯曲变形、残余应力和表面形貌。研究发现,激光功率密度和覆盖率影响试片冲击表层的塑形应变大小及其分布,进而影响试片的弯曲变形;随着覆盖率增大,冲击表面趋于平整;相同激光冲击参数下厚度大于4mm的铝合金试板的曲率半径与试板厚度平方成正比,试片正/反面均为压应力分布,试片弯曲对正面强化表面的残余压应力具有松弛作用。2024 aluminum alloy is deformed by shock waves which are induced by pulse laser of nanosecond duration.Bending deformation, residual stress and surface morphology are studied on laser-shocked specimens. It is found that laser power density and coverage rate strongly influence plastic strains and its distributions, which drive specimens to curve. The laser-shocked surfaces becomes uniform with coverage rate increasing. For specimens of thickness more than 4mm, curvature radius are proportional to specimen thickness, and the compressive residual stresses on shock surface gets more relaxed with arc height increasing.

关 键 词：激光技术 激光加工 激光冲击成形 弯曲变形 2024铝合金 

分 类 号：TG392[金属学及工艺—金属压力加工]