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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800mm/min、离焦量为10mm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。
The finite element model (FEM) of stainless steel-carbon steel laminated plate (SCLS) with bonded surface was established by using thermo-structure indirect coupling method. By analyzing the characteristics of stainless steel, carbon steel and their layers during pulsed laser scanning The temperature field and the distribution of stress and strain field are discussed, and the effect of the bonding surface on the laser bending angle and quality of the laminates is also discussed. The results show that the temperature of the bonding surface is smoothly transferred throughout the laser bending process, and there are obvious lateral stress and strain changes. After the deformation, the upper and lower coatings show horizontal residual tensile stress and the middle base shows horizontal residual compressive stress. When the laser power is 140 W, the scanning speed is 800mm / min and the defocus amount is 10mm, the maximum Z stress in the bond plane is 87.5 MPa, which is less than the bond strength (≥210 MPa) at the laminate interface. Through the pulse laser scanning experiment and simulation, the effective bending of the laminated plate was achieved. The experimental and simulation results were less than 5% error, which provided the theoretical and experimental basis for the laser bending of the laminated material.