Determination of parameters of double-ellipsoidal heat source model based on optimization method

Gu, Ying; Li, Y. D.; Yong, Yang; Xu, Fengjie; Su, Liang

doi:10.1007/s40194-018-00678-w

Cited by 22 publications

(8 citation statements)

References 21 publications

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“…Simulation optimization has been studied by investigating mesh strategies and computational cost for the laser processing of Inconel 718, providing potential for increased efficiency for process parameter optimization [31]. Optimization of parameters for input into the analytical double-ellipsoidal heat source modeling [18] was developed based on isoparametric transformation and computer graphics, not requiring fluid flow consideration [19]. Several studies show the viability of computational models as a valuable option to capture the thermal process while reducing experimental costs, but few studies compare an analytical and numerical approach against each other and validate with experiments.…”

Section: Et Al [1] Incorporatesmentioning

confidence: 99%

“…Early research on modeling heat source for welding applications was done through the work of Rosenthal, Pavelec et al, and Goldak et al As a popular method for modeling, Goldak's double-elliptical model has been a foundational model for researchers to build upon [11,[14][15][16][17][18][19][20][21]. Gery et al [15] incorporates C++ programming into Goldak's method to develop 2D and 3D finite element modeling that defines a moving distributed heat source for plate butt welding processes.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Profile Modeling and Microstructural Evolution in Laser Processing of Inconel 625 Plates

Lawson¹,

Ghayoor²,

Tabei³

et al. 2023

Preprint

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Thermal modeling is used in additive manufacturing laser processes to predict microstructural evolution of the materials under specified process conditions and parameters. The objective of this study was to develop, analyze and compare two predictive models: an analytical model and a numerical model for laser processing of materials of Inconel 625. These models were compared with experimental results for thermal profiling, and the effect of thermal profiles on microstructure of the experimental samples was explored. The three approaches; analytical modeling, numerical modeling, and experimental results were evaluated against thermal profile histories and correlated to microstructural evolution in laser processing. Maximum temperatures in the thermal profile of both models were shown in good agreement when compared to the experimental results. Cooling curves were also correlated with microstructure in terms of grain size, morphology, orientation, and texture evolution, with findings that match previously reported results. This research validates the proposed numerical model for examining optimal laser processing conditions for IN625 through both thermal history and microstructure comparison with experimental results using literature derived thermo-physical material properties.

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Section: Et Al [1] Incorporatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Profile Modeling and Microstructural Evolution in Laser Processing of Inconel 625 Plates

Lawson¹,

Ghayoor²,

Tabei³

et al. 2023

Preprint

View full text Add to dashboard Cite

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“…For reliable output results of the simulation model, it is necessary to determine the exact values of these input parameters. In the case of individual simulations, we can achieve this goal, minimizing the error between the simulation and experimental results by combining the simulation model with some multivariable optimization algorithm [12][13][14][15][16][17][18]. The complexity of the problem arises when it is necessary to determine the optimal values of these parameters for several different simulations [19].…”

Section: Introductionmentioning

confidence: 99%

Multi-objective calibration of the double-ellipsoid heat source model for GMAW process simulation

et al. 2022

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The scope of application of simulation models in welding is limited by the accuracy of their output results. This paper presents a calibration procedure for a three-dimensional quasi-stationary model of heat transfer for gas metal arc welding. The double-ellipsoid heat source used in this model has five input parameters whose value cannot be specified accurately. To estimate these values, we employed a multi-objective calibration procedure with two objective functions using the paretosearch optimization algorithm. Objective functions represented the error between simulated and experimentally observed values of penetration depth and weld bead width during gas metal arc welding of P355GH steel plates. All input parameters were assumed to be a power function of line energy. To reduce computational time, we replaced the numerical model with a response surface methodology metamodel based on an optimal set of simulation results from the numerical model. The results of the simulations based on calculated values of input parameters for the heat source model showed excellent matching with the experimental results.

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“…Despite many works describing the temperature field in welding processes, the continuous search for solutions for individual welding methods, hybrid techniques and related processes still continues. Gu et al [32] proposed an isoparametric transformation and computer graphics technique to optimize the parameters of the double-ellipsoidal heat source model. For thermal analysis of the plasma arc welding process using the FE method, Wu and Gao [33] proposed a combined model of the heat source for mapping the temperature distribution in the keyhole.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Temperature and Phase Transformation during SAW Overlaying

et al. 2019

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The article presents the modeling of temporary temperature and phase share calculations during SAW (submerged arc welding) overlaying of steel elements. The input heat of a melted electrode and the heat of direct electric arc impact have been taken into consideration in the temperature field solution. The characteristic areas (fusion, full and incomplete transformation), have been determined by solidus, A3 and A1 temperatures, respectively. The limit temperatures of the phase trandformations during cooling, based on the cooling rate in the temperature range 800–500 °C according to S355 steel time-temperature-transformation welding diagram, have been determined. The JMAK (Johnson–Mehl–Avrami–Kolmogorov) law and KM (Koistinen–Marburger) formula were used in the phase change kinetic description. Theoretical considerations were illustrated with examples of temperature and phase share computations for welding overlaid S355 steel plate. The analysis of the history of changes in temperature and structural components (phases) was carried out based on the results of numerical simulations as well as metallographic examination after SAW overlaying. The dimensions of the HAZ (heat-affected zone), obtained experimentally, and the structure types confirmed the results of the computation.

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Determination of parameters of double-ellipsoidal heat source model based on optimization method

Cited by 22 publications

References 21 publications

Thermal Profile Modeling and Microstructural Evolution in Laser Processing of Inconel 625 Plates

Thermal Profile Modeling and Microstructural Evolution in Laser Processing of Inconel 625 Plates

Multi-objective calibration of the double-ellipsoid heat source model for GMAW process simulation

Theoretical and Experimental Investigation of Temperature and Phase Transformation during SAW Overlaying

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