C194铜合金薄板单点脉冲激光弯曲特性数值模拟

FEM Numerical Simulation of Single Point Pulsed Laser Bending Properties of C194 Copper Alloy Sheet

为研究薄板脉冲激光弯曲特性,以C194铜合金薄板为研究对象,采用ABAQUS软件对其单点脉冲弯曲成形过程进行有限元数值模拟。结果表明:脉冲激光加热阶段,上下表面存在着明显温度梯度,这是单点脉冲激光弯曲成形过程的主要机制;在应力分布方面,受辐照区域在厚度方向均表现为残余拉应力分布,且存在着一定的梯度分布,单点脉冲激光辐照后,压力分布表现为"中拉外压";在位移场方面,随着温度由高到低,试样出现了由反向弯曲转为正向弯曲的变化,这与材料受热区域的正负应变、压拉应力的转变有关。

In order to study the property of pulsed laser bending forming of thin sheet, C194 copper alloy sheet was used as an investigation object. ABAQUS software was used to numerically simulate the single point bending forming process with finite element method （FEM）. The results show that obvious temperature gradient is appeared on upper and down surfaces at heating stage of pulsed laser, which is considered as the main mechanism of single pulse laser bending. In the aspect of stress distribution, residual tensile stress distribution is presented in the thickness direction of the scanning area, while a certain gradient distribution is also found, after single point pulsed laser scanning, the stress is presented ＂tensile inside and press outside＂ distribution. In the displacement aspect, along with the temperature changed from high to low, the specimen is appeared with a change from negative bending to positive ben- diag. This is related to the transferring of the strain and stress change of the material in heated field.