Guest Editors
Prof. Yongqiang Yang, South China University of Technology, China
Prof. Shoufeng Yang, KU Leuven, Belgium.
Prof. Li Yang, University of Louisville, USA.
Prof. Hao Wang, National University of Singapore, Singapore
Prof. Di Wang, South China University of Technology, China
Prof. Yingjun Wang, South China University of Technology, China
Summary
Additive Manufacturing (AM) is a process of joining materials to make objects from 3D model data, usually layer upon layer. There are barriers and challenges bordering the development of AM. First, there are many complex multi-physics phenomena during most AM processes, such as molten pool dynamic problem and spatter problem. Second, the comprehensive interaction effect among factors like materials, the support of component, heat transfer and operation parameters, result in manufacturing defects. Third, the freeform design based on AM usually is applied in multi-phase or strict conditions that are difficult to measure or analyze. The newly CAD design methods and numerical simulation, as well as other computational approaches are key to solve these problems and push the development of AM.
With the rapid growth of researches in additive manufacturing, we initiate this special issue to highlight the recent developments with simulation and computational approaches in AM. This special issue seeks original manuscripts to investigate the theory, design, optimization, simulation and process of AM. Papers which deal with multi-physics problems, as well as those which deal with the interfaces of mechanics, chemistry, and biology, are particularly encouraged. Various length scales (quantum, nano, micro, meso, and macro), and various time scales (femtoseconds to hours) are of interest. Both experimental and modeling submissions are encouraged.
Potential topics included but are not limited to:
(1) Design, modeling, simulation and analysis based on AM.
(2) Simulation of microstructure stability and evolution during or after the AM process.
(3) Simulation of multi-physics problems in AM, such as molten pool dynamic problem, spatter problem, ejection and injection problems.
(4) AM process enhancements and numerical simulation, such as thermal deformation, crack.
(5) Microstructure and property relationship of the AM components.
(6) Biomedical, energy and other novel applications of AM.
(7) Multi-materials, multi-technology(hybrid) processes and machines enhancements with simulation analysis.
(8) Other related topics…
Keywords
Additive Manufacturing; Computational Physics; Numerical Simulation; Computational Fluid Dynamics; Mechanical Property; Topology Optimization.
Published Papers
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Open Access
EDITORIAL
Introduction to the Special Issue on Design and Simulation in Additive Manufacturing
Di Wang, Yongqiang Yang, Yingjun Wang, Li Yang, Hao Wang, Shoufeng Yang
Computer Modeling in Engineering & Sciences, Vol.126, No.1, pp. 1-4, 2021, DOI:10.32604/cmes.2021.015180
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract This article has no abstract.
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Open Access
ARTICLE
Mesoscopic-Scale Numerical Investigation Including the Inuence of Process Parameters on LPBF Multi-Layer Multi-Path Formation
Liu Cao
Computer Modeling in Engineering & Sciences, Vol.126, No.1, pp. 5-23, 2021, DOI:10.32604/cmes.2021.014693
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract As a typical laser additive manufacturing technology, laser powder
bed fusion (LPBF) has achieved demonstration applications in aerospace,
biomedical and other fields. However, how to select process parameters
quickly and reasonably is still the main concern of LPBF production. In
order to quantitatively analyze the inuence of different process parameters
(laser power, scanning speed, hatch space and layer thickness) on the LPBF
process, the multi-layer and multi-path forming process of LPBF was predicted based on the open-source discrete element method framework Yade
and the open-source finite volume method framework OpenFOAM. Based
on the design of experiments method, a four-factor three-level…
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Open Access
ARTICLE
Inverse Construction Methods of Heterogeneous NURBS Object Based on Additive Manufacturing
Ting Zang, Dongbin Zhu, Guowang Mu
Computer Modeling in Engineering & Sciences, Vol.125, No.2, pp. 597-610, 2020, DOI:10.32604/cmes.2020.09965
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract According to the requirement of heterogeneous object modeling
in additive manufacturing (AM), the Non-Uniform Rational B-Spline
(NURBS) method has been applied to the digital representation of heterogeneous object in this paper. By putting forward the NURBS material
data structure and establishing heterogeneous NURBS object model, the
accurate mathematical unified representation of analytical and free heterogeneous objects have been realized. With the inverse modeling of heterogeneous
NURBS objects, the geometry and material distribution can be better
designed to meet the actual needs. Radical Basis Function (RBF) method
based on global surface reconstruction and the tensor product surface
interpolation method are combined…
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Open Access
ARTICLE
Thermodynamics of Molten Pool Predicted by Computational Fluid Dynamics in Selective Laser Melting of Ti6Al4V: Surface Morphology Evolution and Densification Behavior
Donghua Dai, Dongdong Gu, Qing Ge, Chenglong Ma, Xinyu Shi, Han Zhang
Computer Modeling in Engineering & Sciences, Vol.124, No.3, pp. 1085-1098, 2020, DOI:10.32604/cmes.2020.010927
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract The three-dimensional physical model of the randomly packed powder
material irradiated by the laser beam was established, taking into account the
transformation of the material phase, the melt spreading and the interaction of
the free surface of the molten pool and the recoiling pressure caused by the material evaporation during the selective laser melting. Influence of the processing
parameters on the thermal behavior, the material evaporation, the surface morphology and the densification behavior in the connection region of the molten
pool and the substrate was studied. It was shown that the powder material underwent the transformation from the partial melting…
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Open Access
ARTICLE
Design and Manufacture of Bionic Porous Titanium Alloy Spinal Implant Based on Selective Laser Melting (SLM)
Xiaojun Chen, Di Wang, Wenhao Dou, Yimeng Wang, Yongqiang Yang, Jianhua Wang, Jie Chen
Computer Modeling in Engineering & Sciences, Vol.124, No.3, pp. 1099-1117, 2020, DOI:10.32604/cmes.2020.09619
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract In order to meet the clinical requirements of spine surgery, this paper
proposed the exploratory research of computer-aided design and selective laser
melting (SLM) fabrication of a bionic porous titanium spine implant. The structural design of the spinal implant is based on CT scanning data to ensure correct
matching, and the mechanical properties of the implant are verified by simulation
analysis and laser selective melting experiment. The surface roughness of the
spinal implant manufactured by SLM without post-processing is Ra 15 μm, and
the implant is precisely jointed with the photosensitive resin model of the upper
and lower spine. The…
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Open Access
ARTICLE
A New Finite Element Model with Manufactured Error for Additive Manufacturing
Zhaohui Xia, Zhihao He, Qifu Wang, Yingjun Wang
Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 703-720, 2020, DOI:10.32604/cmes.2020.010368
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract Additive manufacturing (AM), adding materials layer by layer, can be
used to produce objects of almost any shape or geometry. However, AM techniques cannot accurately build parts with large overhangs, especially for the large
features close to horizontal, hanging over the void. The overhangs will make
the manufactured model deviate from the design model, which will result in
the performance of the manufactured model that cannot satisfy the design requirements. In this paper, we will propose a new finite element (FE) analysis model
that includes the manufacturing errors by mimicking the AM layer by layer construction process. In such FE…
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Open Access
ARTICLE
Numerical Simulation of Multi-Layer Penetration Process of Binder Droplet in 3DP Technique
Xiangyu Gao, Weidong Yang, Hongxuan Xian, Xiyuan Tu, Yuanyuang Wang
Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 227-241, 2020, DOI:10.32604/cmes.2020.09923
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract This paper studies the binder droplet injection process in the 3DP technique. The mathematical model of the binder penetration process for multi-nozzle
and multi-layer in 3DP technique is established, by using the conservation Level
set method. According to the two-dimensional plane model of three-dimensional
spatial structure of sand bed, the construction method of an equivalent cylindrical
mapping infiltration model is proposed to represent the porosity of the model in
the two-dimensional plane, which is exactly the same as that in the three-dimensional
space, as well as closer to the arrangement of the three-dimensional space, and to
realize the differentiation between…
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Open Access
ARTICLE
Investigation into Spatter Particles and Their Effect on the Formation Quality During Selective Laser Melting Processes
Zhiqiang Wang, Xuede Wang, Xin Zhou, Guangzhao Ye, Xing Cheng, Peiyu Zhang
Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 243-263, 2020, DOI:10.32604/cmes.2020.09934
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract During the selective laser melting process, a high-energy laser beam acts on
the powder, a molten pool is rapidly generated and the characteristic parameters are
constantly changing. Among them, temperature is one of the important parameters
in the forming process. Due to the generation of splash particles, there will be defects
in the microstructure, which will seriously affect the formation quality of the prepared
parts. Therefore, it is necessary to study the relationships between the splash behavior,
molten pool characteristics and product quality. The finite element simulation of the
transient temperature field was performed by ANSYS software. Time-series images
at…
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Open Access
ARTICLE
Novel Micromixer with Complex 3D-Shape Inner Units: Design, Simulation and Additive Manufacturing
Di Wang, Guangzhao Ye, Jingming Mai, Xiaomin Chen, Yongqiang Yang, Yang Li, Xiaojun Chen, Jie Chen
Computer Modeling in Engineering & Sciences, Vol.123, No.3, pp. 1061-1077, 2020, DOI:10.32604/cmes.2020.09842
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract In this paper, a novel micromixer with complex 3D-shape inner units
was put forward and fabricated by metal Additive Manufacturing (AM). The
design of the micromixer combined the constraints of selective laser melting technology and the factors to improve mixing efficiency. Villermaux-Dushman reaction system and Compute Fluid Design (CFD) simulation were conducted to
investigate the performance and the mechanism of this novel micromixer to
improve mixing efficiency. The research found that the best mixing efficiency
of this novel micromixer could be gained when the inner units divided fluid into
five pieces with a uniform volume. Compared with a conventional micromixer…
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Open Access
ARTICLE
Innovative Design and Additive Manufacturing of Regenerative Cooling Thermal Protection System Based on the Triply Periodic Minimal Surface Porous Structure
Xinglong Wang, Cheng Wang, Xin Zhou, Mingkang Zhang, Peiyu Zhang, Lei Wang
Computer Modeling in Engineering & Sciences, Vol.123, No.2, pp. 495-508, 2020, DOI:10.32604/cmes.2020.09778
（This article belongs to this Special Issue:
Design & simulation in Additive Manufacturing)
Abstract The new regenerative cooling thermal protection system exhibits the
multifunctional characteristics of load-carrying and heat exchange cooling, which
are fundamental for the lightweight design and thermal protection of hypersonic
vehicles. Triply periodic minimal surface (TPMS) is especially suitable for the
structural design of the internal cavity of regenerative cooling structures owing
to its excellent structural characteristics. In this study, test pieces were manufactured using Ti6Al4V lightweight material. We designed three types of porous test
pieces, and the interior was filled with a TPMS lattice (Gyroid, Primitive, I-WP)
with a porosity of 30%. All porous test pieces were manufactured via selective…
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