【摘要】 建立了箔材微尺度激光弯曲成形的三维热力耦合有限元模型,并采用大型非线性有限元软件MSC.Marc对其激光弯曲成形过程进行数值模拟.通过模拟计算得到了箔材弯曲变形过程中的温度场、变形场与应力应变场.分析了应力、温度、变形三者之间的内在关系.研究发现:采用功率为25 W,光斑直径为0.2 mm的激光光束,以100 mm/s速度扫描厚度为0.1 mm的不锈钢箔,其弯曲成形的主要机理为温度梯度机理.更多还原

【Abstract】 A 3-D thermal-mechanical finite element analysis model for laser micro-bending of stainless steel foil is developed.The software MSC.Marc is used in the numerical analysis of this process.The detailed simulation results such as temperature distribution,deformation filed,stress and strain field are obtained.The inner relationship among stress,temperature and deformation is investigated.Through the analysis,it is found that the deformation mechanism is the Temperature Gradient Mechanism(TGM) when the thickness of stainless steel foil,laser power,beam diameter and scanning velocity are 0.1 mm,25 W,0.2 mm and 100 mm/s respectively.更多还原