铜合金薄板的脉冲激光弯曲成形数值分析与实验

Numerical analysis and experimental study on pulsed laser bending forming of copper alloy thin-plate

借助有限元方法研究C194铜合金薄板的脉冲激光弯曲成形。建立脉冲激光弯曲成形的热力耦合分析模型,解决了激光热源加载、求解稳定性和精度控制等关键技术;对多点脉冲激光弯曲成形进行有限元模拟,通过对模型的温度场、应力/应变场和位移场的动态变化和稳态分布的分析,揭示了其成形机理和规律,薄板的整体弯曲成形是所有脉冲变形效应的叠加结果,且变形量与脉冲次数有着明显的线性关系。实验结果表明,数值分析结果与实验结果有较好的一致性。

Pulsed laser bending forming of copper alloy thin-plate was studied by finite element method,and the thermal-mechanical coupling model was established.Some key techniques including pulsed laser heat source loading,the solution stability and precision control in simulation were studied and solved.Multi-point pulsed laser bending forming process was simulated.Based on the analysis of dynamic changes and steady distributions of the fields of temperature,stress/strain and displacement,the mechanism and the rules of pulsed laser bending forming were revealed.The whole deformation of thin-plate was the additive result of all impulse actions,and the deformation value had clear linear relationship with the pulse number.The research showed that the numerical results were in good agreement with the experimental results.