Numerical simulation of laser heating of metal with three absorptivity models
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摘要: 为了比较单一常数吸收率模型、固态和液态吸收率分别为常数的组合吸收率模型以及温度相关吸收率模型对于数值结果的影响,分别采用这3种吸收率模型建立了空间轴对称有限元计算模型,模拟了激光加热铝板的过程,对比了不同吸收率模型下的计算结果,讨论了这几种吸收率模型的优劣和适用范围.结果表明,对于固态和液态均明显存在的加热过程,固态和液态阶段分别为不同常数的组合吸收率模型能得到与使用吸收率温度相关模型很相似的结果,而使用单一的常数吸收率模型与之相比则差别较大;对于加热区域为单一物态的加热过程,使用单一常数吸收率模型与使用吸收率温度相关模型的计算结果有一定的差别,但差别不大.Abstract: There are three absorptivity models,i.e.the single constant absorptivity model,assembled constant absorptivity model whose liquid-state and solid-state absorptivity are both constant and temperature-dependent absorptivity models.In order to compare the influences of the three models on the numerical results,a spatial axis-symmetric finite element calculation model was established based on the three absorptivity models respectively.The laser heating process of an aluminum plate was simulated and the three numerical results were compared.The advantages and disadvantages and the application scope of the three absorptivity models were discussed.The results show that for the heating process of both solid state and liquid state existing evidently,the computed results based on the assembled constant absorptivity model are similar with those based on the temperature-dependent model.However,for the heating process of only one single physical state existing,the computed results based on the constant absorptivity model are a little different with those based on the temperature-dependent model.
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Keywords:
- laser technique /
- laser heating /
- absorptivity /
- finite element /
- metal
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