Wentao Yan
National University of Singapore
Work (thermodynamics)Finite element methodFabricationDeposition (phase transition)FusionComposite materialDiscrete element methodMaterials scienceThermalLayer (electronics)Cellular automatonComputer scienceProcess (engineering)Finite volume methodLaserMechanicsFlow (psychology)Mechanical engineeringMicrostructureCathode rayProcess (computing)Grain growth
56Publications
18H-index
1,067Citations
Publications 55
Newest
#1Haibin Tang (Nanjing University of Science and Technology)H-Index: 5
#2Qingping Sun (Ford Motor Company)H-Index: 8
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
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Abstract Fused filament fabrication (FFF) with continuous carbon fiber filaments has proven to be a promising manufacturing technique in engineering applications. To provide guidance in the design of 3D printed carbon fiber reinforced polymer (CFPR) components, the longitudinal compression failure of continuous CFPR composites using the FFF technique is investigated systematically. First, longitudinal compression tests are performed for 3D printed continuous CFRP composites with and without desi...
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#1Nicolò GrilliH-Index: 10
Last. Wentao Yan (NUS: National University of Singapore)
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Selective laser melting is receiving increasing interest as an additive manufacturing technique. Residual stresses induced by the large temperature gradients and inhomogeneous cooling process can favour the generation of cracks. In this work, a crystal plasticity finite element model is developed to simulate the formation of residual stresses and to understand the correlation between plastic deformation, grain orientation and residual stresses in the additive manufacturing process. The temperatu...
#1Yefeng YuH-Index: 2
Last. Feng LinH-Index: 25
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The dendrite growth in casting and additive manufacturing is rather important and related to the formation of some defects. However, quantitatively simulating the growth of dendrites with arbitrary crystallographic orientations in 3-dimension(3D) is still very challenging. In the present work, we develop a multi-grid Cellular Automaton (CA) model for the dendrite growth. In this model, the interfacial area is further discretized into a child grid, on which the decentered octahedron growth algori...
#1Min Yang (NUS: National University of Singapore)
#2Lu Wang (NUS: National University of Singapore)H-Index: 1
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
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A three-dimensional phase-field model is developed to simulate grain evolutions during powder-bed-fusion (PBF) additive manufacturing, while the physically-informed temperature profile is implemented from a thermal-fluid flow model. The phase-field model incorporates a nucleation model based on classical nucleation theory, as well as the initial grain structures of powder particles and substrate. The grain evolutions during the three-layer three-track PBF process are comprehensively reproduced, ...
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#1Hui Chen (NUS: National University of Singapore)H-Index: 11
#2Wei Zhu (NTU: Nanyang Technological University)H-Index: 25
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
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Abstract Short fiber reinforced polymer composites processed by selective laser sintering (SLS) generally show an oriented fiber structure, which leads to anisotropic properties of fabricated components. However, the formation mechanism of fiber orientation is barely investigated. In this study, the oriented structure of the carbon fiber/polyamide12 composites processed by SLS is characterized using the X-ray computed tomography, and the role of powder-spreading in formation of the fiber orienta...
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#1Haibin Tang (NUS: National University of Singapore)H-Index: 5
#2Haijun Huang (NUS: National University of Singapore)H-Index: 1
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
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Abstract This paper presents a multi-scale modelling framework to evaluate the structure-property relationship of metallic materials fabricated by powder-bed additive manufacturing (AM) technique based on crystal plasticity finite element methods. In this framework, a new synthetic microstructure generation approach is proposed to reconstruct micro-scale models of AMed metals according to the characteristics of grain growth in the fabrication process. The constitutive relation of individual grai...
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#1Shuhao Wang (NU: Northeastern University)H-Index: 5
#2Lida Zhu (NU: Northeastern University)H-Index: 19
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
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As a promising additive manufacturing method, direct energy deposition has been widely used to fabricate complex thin-walled parts. However, some defects such as uneven layer surface and excessive build-ups always occur in this process. In this study, a high-fidelity model adopting a novel laser/powder source is developed to simulate the detailed multi-layer deposition process. With layer surfaces being tracked in real-time, laser source model incorporates local incidence angle and defocusing am...
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#1Feiyu Xiong (BIT: Beijing Institute of Technology)H-Index: 1
#2Chenyang Huang (BIT: Beijing Institute of Technology)H-Index: 1
Last. Daining Fang (BIT: Beijing Institute of Technology)H-Index: 64
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Abstract An integrated modeling framework coupling the discrete element method for powder spreading, finite volume method for powder bed melting, and an extended cellular automaton method for grain structure evolution during solidification is proposed. In this framework, the initial grain structure of both the substrate and metal powders can be taken into account and used to capture epitaxial and competitive grain growth. The framework is used to provide an in-depth understanding of microstructu...
1 CitationsSource
#1Haibin Tang (NUS: National University of Singapore)H-Index: 5
#2Hui Chen (NUS: National University of Singapore)H-Index: 11
Last. Wentao Yan (NUS: National University of Singapore)H-Index: 18
view all 5 authors...
Abstract A fundamental understanding of structure-property relationship of carbon fiber reinforced polymer (CFRP) composites fabricated by selective laser sintering (SLS) is essential to provide guidance to improve the mechanical properties in this promising additive manufacturing process. In the present study, we propose a new computational framework to evaluate the mechanical behavior of SLSed CFRP based on the representative volume element (RVE) model. Firstly, a new voxel-based fiber packing...
3 CitationsSource
#1Lu WangH-Index: 1
#2Yanming ZhangH-Index: 1
Last. Wentao YanH-Index: 1
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The molten-pool flow, particularly the keyhole effect, plays a critical role in the formation of defects in additive-manufacturing and welding processes. In this study, we derive an evaporation model for metal alloys considering the gas-flow structure and material composition and implement it in a multiphysics thermal-fluid flow model, which utilizes the volume of fluid (VOF) in the finite volume method (FVM) to capture free surfaces and the ray-tracing method to track multireflections of laser ...
1 CitationsSource