Li Zihui, Wang Xuyue
School of Mechanical Engineering, Dalian University of Technology, Dalian 116023, China.
Materials (Basel). 2019 Apr 30;12(9):1410. doi: 10.3390/ma12091410.
According to ANSYS software and an electron probe experiment, a multi-layer finite element model (FEM) of pulsed laser bending of stainless steel-carbon steel laminated plate (SCLP) including interfaces has been established. Compared with a single-layer stainless steel plate (SLSP), based on a temperature gradient mechanism considering the depth of the plastic zone, the influence of the interfaces and carbon steel layer in the model of the SCLP on the bending angle has been studied by analyzing the distributions of the temperature field, stress field and strain field in the thickness direction. The simulation results show that the temperature of the SCLP in the thickness direction is lower than that of the SLSP due to interfacial thermal resistance of the interface and fast heat conduction of the carbon steel layer, resulting in a smaller depth of the plastic zone of the SCLP defined by the recrystallization temperature. Affected by the temperature distribution, the plastic stress and strain of the SCLP in the plastic zone are smaller than those of the SLSP, leading to a smaller bending angle of the SCLP. When the laser power is 140 W, the scanning speed is 400 mm/min, the defocus distance is 10 mm, and the scanning time is 1, the bending angle of the SCLP is 1.336°, which is smaller than the bending angle 1.760° of the SLSP. The experimental verifications show that the maximum error of the bending angle is 3.74%, which verifies that the model of laser bending is usable and contributes to refining the laser bending mechanism of the SCLP.
根据ANSYS软件和电子探针实验，建立了包含界面的不锈钢-碳钢层合板（SCLP）脉冲激光弯曲的多层有限元模型（FEM）。与单层不锈钢板（SLSP）相比，基于考虑塑性区深度的温度梯度机制，通过分析厚度方向上的温度场、应力场和应变场分布，研究了SCLP模型中的界面和碳钢层对弯曲角度的影响。模拟结果表明，由于界面的界面热阻和碳钢层的快速热传导，SCLP在厚度方向上的温度低于SLSP，导致由再结晶温度定义的SCLP塑性区深度较小。受温度分布影响，SCLP在塑性区的塑性应力和应变小于SLSP，导致SCLP的弯曲角度较小。当激光功率为140 W、扫描速度为400 mm/min、离焦距离为10 mm且扫描时间为1时，SCLP的弯曲角度为1.336°，小于SLSP的弯曲角度1.760°。实验验证表明，弯曲角度的最大误差为3.74%，验证了激光弯曲模型的可用性，有助于完善SCLP的激光弯曲机制。
