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Mechanisms during laser bending

机译：激光弯曲的机理

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摘要

In order to investigate the thermomechanical phenomena during the laser bending process, a simulation is performed. The governing thermoelastic-plastic equations are integrated by the finite element method. The results are related to predictions as given by the so-called temperature gradient mechanism (TGM), which is often used in the context of laser bending. It turns out that approximative identical temperature time cycles result in a plane and a prebended sheet in completely different forming behavior, whereby the forming behavior for the bended sheet depends on which side is laser treated. This means that a quantification of the extension and homogeneity of laser generated temperature field is insufficient for the prediction of forming behavior. The TGM model does not take into account the influence of the different stiffness of a plane or bended sheet on the stress and strain history in the laser treated zone. For this reason the TGM model can't predict the different forming behavior of the plane and the bended sheet.
机译：为了研究激光弯曲过程中的热机械现象，进行了仿真。控制热弹塑性方程通过有限元方法进行积分。结果与所谓的温度梯度机制（TGM）给出的预测有关，通常在激光弯曲的情况下使用。结果表明，近似相同的温度时间周期导致一个平面和一个预弯曲的板完全不同的成形行为，从而弯曲板的成形行为取决于哪一侧进行了激光处理。这意味着对激光产生的温度场的延伸和均匀性的量化不足以预测成形行为。 TGM模型没有考虑平面或弯曲板的不同刚度对激光处理区中应力和应变历史的影响。因此，TGM模型无法预测平面和弯曲板的不同成形行为。

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