Numerical simulation of the extrusion process of viscoplastic materials using a radial point interpolation method

IF 1.5 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Engineering Computations Pub Date : 2023-11-06 DOI:10.1108/ec-01-2023-0044
Daniel E.S. Rodrigues, Jorge Belinha, Renato Natal Jorge
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Abstract

Purpose Fused Filament Fabrication (FFF) is an extrusion-based manufacturing process using fused thermoplastics. Despite its low cost, the FFF is not extensively used in high-value industrial sectors mainly due to parts' anisotropy (related to the deposition strategy) and residual stresses (caused by successive heating cycles). Thus, this study aims to investigate the process improvement and the optimization of the printed parts. Design/methodology/approach In this work, a meshless technique – the Radial Point Interpolation Method (RPIM) – is used to numerically simulate the viscoplastic extrusion process – the initial phase of the FFF. Unlike the FEM, in meshless methods, there is no pre-established relationship between the nodes so the nodal mesh will not face mesh distortions and the discretization can easily be modified by adding or removing nodes from the initial nodal mesh. The accuracy of the obtained results highlights the importance of using meshless techniques in this field. Findings Meshless methods show particular relevance in this topic since the nodes can be distributed to match the layer-by-layer growing condition of the printing process. Originality/value Using the flow formulation combined with the heat transfer formulation presented here for the first time within an in-house RPIM code, an algorithm is proposed, implemented and validated for benchmark examples.
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用径向点插值法对粘塑性材料挤压过程进行数值模拟
熔融长丝制造(FFF)是一种基于熔融热塑性塑料的挤出制造工艺。尽管FFF成本很低,但由于零件的各向异性(与沉积策略有关)和残余应力(由连续加热循环引起),它并没有广泛应用于高价值的工业部门。因此,本研究旨在探讨工艺改进和优化的打印部件。设计/方法/方法在这项工作中,使用无网格技术-径向点插值法(RPIM) -数值模拟粘塑性挤出过程- FFF的初始阶段。与有限元法不同,在无网格方法中,节点之间没有预先建立的关系,因此节点网格不会出现网格畸变,并且可以通过在初始节点网格中添加或删除节点来轻松地修改离散化。所得结果的准确性突出了在该领域使用无网格技术的重要性。无网格方法在这个主题中表现出特别的相关性,因为节点可以分布以匹配打印过程的逐层生长条件。本文首次在内部RPIM代码中使用流动公式与传热公式相结合的方法,提出了一种算法,并对基准示例进行了实现和验证。
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来源期刊
Engineering Computations
Engineering Computations 工程技术-工程:综合
CiteScore
3.40
自引率
6.20%
发文量
61
审稿时长
5 months
期刊介绍: The journal presents its readers with broad coverage across all branches of engineering and science of the latest development and application of new solution algorithms, innovative numerical methods and/or solution techniques directed at the utilization of computational methods in engineering analysis, engineering design and practice. For more information visit: http://www.emeraldgrouppublishing.com/ec.htm
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