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首页> 外文期刊>Journal of thermal stresses >Numerical investigations into influence of scanning path curvature on deformation behavior during curvilinear laser bending of magnesium sheets
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Numerical investigations into influence of scanning path curvature on deformation behavior during curvilinear laser bending of magnesium sheets

机译：扫描路径曲率对镁薄板弯曲激光弯曲变形行为影响的数值研究

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摘要

In laser bending process, metal sheets are deformed by using thermal stresses induced due to controlled laser heating. Straight line heating is used to manu facture simple shapes while curvilinear irradiation is used to generate 3D complex shapes. Scanning path curvature is an important parameter that controls the deformation profile of a worksheet. This article presents systematic investigations into influence of scanning path curvature on the thermal stresses based deformation behavior, temperature distribution and warping of the magnesium M1A sheets. Initially, a three-dimensional nonlinear thermomechanical finite element model of curvilinear laser bending process has been developed. Mathematical correlations have been derived to model the curvilinear irradiations. The developed model has been validated by using experimental studies. Then, numerical investigations have been performed on temperature distribution, stress-strain distribution and distortions occur in the laser bent magnesium alloy sheets. Results indicated that sheet bends away from the scanning path. One of the key findings is that low to medium levels of arc height reduce the edge effect during laser bending, while higher values of arc height produce warping at the free edge. It is envisaged that presented results will be useful to manufacture 3D complex shapes and to align complex geometry sheets.
机译：在激光弯曲过程中，金属板通过利用由于受控的激光加热而引起的热应力而变形。直线加热用于制造简单的形状，而曲线照射用于生成3D复杂的形状。扫描路径曲率是控制工作表变形轮廓的重要参数。本文对扫描路径曲率对基于热应力的M1A镁板的变形行为，温度分布和翘曲的影响进行了系统的研究。最初，已建立了曲线激光弯曲过程的三维非线性热机械有限元模型。已经得出了数学相关性以对曲线辐射进行建模。通过实验研究验证了开发的模型。然后，对激光弯曲镁合金薄板中的温度分布，应力-应变分布和变形进行了数值研究。结果表明纸张弯曲离开扫描路径。关键发现之一是低至中等水平的电弧高度会降低激光弯曲过程中的边缘效应，而较高的电弧高度会在自由边缘产生翘曲。可以设想，呈现的结果将对制造3D复杂形状和对齐复杂的几何图形很有用。

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