金属板料激光喷丸成形新技术  

A New Technology of Plastic Forming Plate by Laser Peening

作　　者：周建忠[1] 张兴权[1] 王广龙[1] 杨超君[1] 张永康[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《中国工程科学》2005年第11期94-97,共4页Strategic Study of CAE

基　　金：国家自然科学基金资助项目(50475127;50275068);江苏省自然科学基金资助项目(BK2004063);国家教育部重点科技基金资助项目(204052);国家高技术发展计划资助项目(2002AA336030)

摘　　要：激光喷丸塑性成形金属板料是从激光强化发展起来的新技术。当激光诱导冲击波的峰值超过材料的动态屈服极限时,板料冲击区的表层发生微观塑性变形,导致了板料厚度方向上不均匀应力分布,使板料发生宏观变形。不同的激光脉冲参数在板料内部产生不同的残余应力,不同的残余应力使板料发生不同的变形,通过控制喷丸的工艺参数来控制板料内部应力场的精确分布,就可实现板料的精确变形。其显著特点是成形精确,且表层留有有益的残余压应力。Laser peening forming is an emerging modern process developed from laser shock strengthening.During a laser peening event, pressures well above the dynamic yield strength of the material are imparted to the target in a fraction of nanoseconds. The severity of the loading causes local plastic deformation which ultimately results in the development of the uneven residual stress along the thickness of plate, which pushes the plate to deform. Different parameters of laser can induce different residual stress which make plate achieve different shapes, so controlling technical parameters of laser peening can control the distribution of residual stress,indirectly controlling the deformation of plate to satisfy its design. Laser peening forming is a flexible technology, which can form tight radii in thick material with high accuracy and compressive stress into its surface to extend fatigue lifetime. In the end of the paper, the application prospect of technology is outlined.

关 键 词：激光喷丸成形 金属板料 残余应力 

分 类 号：TN249[电子电信—物理电子学]