考虑结合面的不锈钢碳钢层合板脉冲激光弯曲数值模拟

采用热结构间接耦合方法，建立了含结合面的不锈钢碳钢层合板(SCLS)脉冲激光弯曲多层有限元模型(FEM)，通过分析脉冲激光扫描过程中不锈钢层、碳钢层及其结合面的温度场、应力应变场的分布情况，探讨了结合面对层合板激光弯曲角度和质量的影响。研究结果表明,整个激光弯曲过程中结合面处温度平滑传递，横向应力和应变均存在明显突变，变形结束后，上下覆层呈现横向残余拉应力，中间基层呈现横向残余压应力；当激光功率为140 W、扫描速度为800 mm/min、离焦量为10 mm时，结合面最大Z向应力为87.5 MPa，小于层合板界面结合强度(≥210 MPa)。通过脉冲激光扫描实验和模拟，实现了层合板的有效弯曲，实验结果与模拟结果误差小于5%，为层合材料激光弯曲成形提供了理论与实验依据。

Abstract

Behavior of stainless steel-carbon steel laminated sheet (SCLS) including interfaces during pulsed laser bending is investigated using a multi-layered finite element model (FEM) based on thermal-structure indirect couple method. Through the analysis on temperature field, stress-strain field and displacement of stainless steel layer, carbon steel layer and the bonding interface during laser bending process, the impact of interface on bending angles and bending quality are explored. The results show that during laser bending process, temperature transfers smooth across the bonding interface, while transverse stress and strain have obvious mutations. After deformation, tensile stress exists at both the top and bottom stainless steel layers and compressive stress exists at the middle carbon steel layer. When laser power is 140 W, scanning speed is 800 mm/min, the defocus amount is 10 mm, the maximum stress of Z-direction on the bonding interface is 87.5 MPa, which is smaller than the bonding strength of the laminate sheet (≥210 MPa). An effective curved laminate sheet is achieved using both experiment and simulation methods and the error is less than 5%. The simulation provides a good basis on both theory and experiment for better bending quality of SCLS.

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考虑结合面的不锈钢碳钢层合板脉冲激光弯曲数值模拟

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