Modeling of laser beam absorption on rough surfaces, powder beds and sparse powder layers

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Results in Physics Pub Date : 2024-11-19 DOI:10.1016/j.rinp.2024.108043
Giandomenico Lupo , Martin Niemann , Christoph Goniva , Wojciech Szmyt , Xiao Jia , Vladyslav Turlo
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Abstract

The energy transfer from a laser beam source to material surfaces with arbitrary geometrical features and variable surface roughness is the crucial step in many high-end engineering applications. We propose two models capable of predicting this energy transfer, applicable in different scenarios. The first is a high-fidelity numerical framework for the simulation of laser beam interaction with rough surfaces, which includes meshed geometry of arbitrary shape and material Lagrangian particles. The method discretizes the laser source as a collection of photon-type immaterial Lagrangian particles (Discrete Element Method) and is able to capture the effects of multiple reflections, angle-dependent reflectivity, and polarization change. Simulations were performed on a geometry reconstructed from a rough copper sample to reveal the impact of the polarization effects. This method is generally applicable to any surface where the effects of inelastic light scattering are not expected to play a significant role. The second model is a novel phenomenological correlation specifically designed to predict the effective reflectivity of sparse powder layers, which occur for example when metal vapor is recondensed and redeposited on the substrate during laser welding. The correlation is compared to the predictions obtained from the simulation framework and has been favorably compared to experimental data in a separate publication.

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粗糙表面、粉末床和稀疏粉末层的激光束吸收建模
从激光束源到具有任意几何特征和可变表面粗糙度的材料表面的能量传递,是许多高端工程应用中的关键步骤。我们提出了两种能够预测这种能量传递的模型,适用于不同的应用场景。第一个模型是用于模拟激光束与粗糙表面相互作用的高保真数值框架,其中包括任意形状的网格几何体和材料拉格朗日粒子。该方法将激光源离散化为光子型非物质拉格朗日粒子的集合(离散元素法),能够捕捉多重反射、随角度变化的反射率和偏振变化的影响。我们对粗糙铜样品重建的几何形状进行了模拟,以揭示偏振效应的影响。这种方法一般适用于非弹性光散射效应预计不会发挥重要作用的任何表面。第二个模型是一个新颖的现象学相关模型,专门用于预测稀疏粉末层的有效反射率,例如在激光焊接过程中金属蒸气重新凝结并重新沉积在基体上时的反射率。该相关性与模拟框架得出的预测结果进行了比较,并在另一份出版物中与实验数据进行了良好的比较。
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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