Modelling of electron beam absorption in complex geometries
Modelling of electron beam absorption in complex geometries
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DOI：
10.1088/0022-3727/47/6/065307
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发表时间：
2014-02-12
影响因子：
3.4
通讯作者：
Koerner, Carolin
中科院分区：
文献类型：
--
作者：
Klassen, Alexander;Bauereiss, Andreas;Koerner, Carolin
涉及高能电子的过程的计算建模，例如电子束熔化、焊接、钻孔或电子束光刻，仅举几例，需要关于电子束穿过样品时的衰减的信息。深度剂量曲线作为电子能量的函数，靶材料以及局部表面结晶度必须在计算过程中提供原位。解决这个问题最有效的方法是使用数学表达式。因此，我们提出了一个电子束模型的基础上，一组半经验方程，可从不同的出版文献和理论上的考虑。特别强调的是，从而把准确性和有效性的理论方法与实验数据进行比较的范围。最后，我们将我们的模型应用于基于粉末床的增材制造。数值计算结果表明，电子束吸收和穿透深度有很大的影响，所制造的产品的质量。
Computational modelling of processes that involve highly energetic electrons like electron beam melting, welding, drilling or electron beam lithography, to name but a few, requires information about the attenuation of the electron beam as it passes through the sample. Depth-dose curves as a function of electron energy, target material as well as local surface obliquity have to be provided in situ during the calculation. The most efficient way to address this issue is by employing mathematical expressions. Therefore, we propose an electron beam model based on a set of semi-empirical equations available from different published literature and on theoretical considerations. Particular stress is thereby put on accuracy and the range of validity of the theoretical approach by comparison with experimental data. Finally, we apply our model to powder-bed based additive manufacturing. The numerical results demonstrate that electron beam absorption and depth of penetration have a strong influence on the quality of the fabricated product.