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Patcharapit Promoppatum
Researcher at King Mongkut's University of Technology Thonburi
Publications - 28
Citations - 748
Patcharapit Promoppatum is an academic researcher from King Mongkut's University of Technology Thonburi. The author has contributed to research in topics: Residual stress & Computer science. The author has an hindex of 9, co-authored 19 publications receiving 364 citations. Previous affiliations of Patcharapit Promoppatum include Institute of High Performance Computing Singapore & Carnegie Mellon University.
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A Comprehensive Comparison of the Analytical and Numerical Prediction of the Thermal History and Solidification Microstructure of Inconel 718 Products Made by Laser Powder-Bed Fusion
TL;DR: In this paper, the authors compared the effect of radiative and convective losses in the Rosenthal equation, which is assumed to be negligible in the finite element model, and the Rosenthal approach is more sensitive to absorptivity compared with the FE approach.
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Numerical modeling of the thermal behavior and residual stress in the direct metal laser sintering process of titanium alloy products
Abstract: In this paper the heat transfer and residual stress evolution in the direct metal laser sintering process of the additive manufacturing of titanium alloy products are studied. A numerical model is developed in a COMSOL multiphysics environment considering the temperature-dependent material properties of TiAl6V4. The thermo-mechanical coupled simulation is performed. 3-D simulation is used to study single-layer laser sintering. A 2-D model is used to study the multi-layer effects of additive manufacturing. The results reveal the behavior of the melt pool size, temperature history, and change of the residual stresses of a single layer and among the multiple layers of the effects of the change of the local base temperature and laser power etc. The result of the simulation provides a better understanding of the complex thermo-mechanical mechanisms of laser sintering additive manufacturing processes.
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Numerical and experimental investigations of micro and macro characteristics of direct metal laser sintered Ti-6Al-4V products
TL;DR: In this paper, numerical models along with physical criteria and analytical equations are used to establish the processing window to show the interplay between the processing parameters and suggest the desirable operating regions.
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Influence of scanning length and energy input on residual stress reduction in metal additive manufacturing: Numerical and experimental studies
TL;DR: In this paper, a mesoscale model was developed to examine thermal and mechanical responses in a single layer and a numerical-based process window was constructed to show the correlation among process parameters, surface temperature, and residual stress.
Journal ArticleDOI
Numerical modeling and experimental validation of thermal history and microstructure for additive manufacturing of an Inconel 718 product
Patcharapit Promoppatum,Shi-Chune Yao,P. Chris Pistorius,Anthony D. Rollett,Peter J. Coutts,Frederick Lia,Richard Martukanitz +6 more
TL;DR: In this article, a product-scale part was additively manufactured from Inconel 718 by laser powder-bed fusion, and the thermal and microstructural behavior was experimentally examined to reveal physical characteristics while a high fidelity numerical model was developed to predict the characteristics throughout the part volume.