Modelling of high-density laser-material interaction using fast level set method

Ki, Hyungson; Mohanty, Prasanna; Mazumder, J.

doi:10.1088/0022-3727/34/3/320

Cited by 114 publications

(49 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, strong hypotheses were introduced to cope with the numerical issues related to the fast phase transformations and high thermal gradient involved in laser processes. The works in [20] and [11] incorporated an analytical velocity profile to describe the melted flow. In [26], a pressure profile is assumed to reduce the free surface instabilities.…”

Section: Introductionmentioning

confidence: 99%

Modeling laser drilling in percussion regime using constraint natural element method

et al. 2015

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The laser drilling process is the main process used in machining procedures on aeronautic engines, especially in the cooling parts. The industrial problematic is to reduce geometrical deviations of the holes and defects during manufacturing. The interaction between a laser beam and an absorbent metallic matter in the laser drilling regime involves thermal and hydrodynamical phenomenon. Their role on the drilling is not yet completely understood and a realistic simulation of the process could contribute to a better understanding of these phenomenon. The simulation of such process induces strong numerical difficulties. This work presents a physical model combined with the use of the original Constraint Natural Element Method to simulate the laser drilling. The physical model includes solid/liquid and liquid/vapor phase transformations, the liquid ejection and the convective and conductive thermal exchanges. It is the first time that all these phenomena are included in a modelling and numerically solved in a 2D axisymmmetric problem. Simulations results predict most of measurements (hole geometry, velocity of the liquid ejection and laser drilling velocity) without adjusting any parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling laser drilling in percussion regime using constraint natural element method

et al. 2015

View full text Add to dashboard Cite

show abstract

“…These solid-liquid and liquid-gas interfacial conditions are of importance to be comprehensively understood as they can contribute to the formation of residual stresses and distortions during the welding operation. Over the last two decades, literature has been reported on sophisticated modeling approaches [7][8][9][10][11][12] and experimental techniques [13][14][15][16][17][18] to study the dynamics of the keyhole phenomena during high power density fusion welding technologies, such as laser welding. From a modeling perspective, the interface deformation that leads to keyhole formation during the laser welding has been studied intensively using various numerical techniques, including a volume-of-fluid approach [13,14] and a level set method.…”

mentioning

confidence: 99%

An Integrated Modeling Approach for Predicting Process Maps of Residual Stress and Distortion in a Laser Weld: A Combined CFD–FE Methodology

Turner

Panwisawas

Sovani

et al. 2016

Metall Mater Trans B

View full text Add to dashboard Cite

Laser welding has become an important joining methodology within a number of industries for the structural joining of metallic parts. It offers a high power density welding capability which is desirable for deep weld sections, but is equally suited to performing thinner welded joints with sensible amendments to key process variables. However, as with any welding process, the introduction of severe thermal gradients at the weld line will inevitably lead to process-induced residual stress formation and distortions. Finite element (FE) predictions for weld simulation have been made within academia and industrial research for a number of years, although given the fluid nature of the molten weld pool, FE methodologies have limited capabilities. An improvement upon this established method would be to incorporate a computational fluid dynamics (CFD) model formulation prior to the FE model, to predict the weld pool shape and fluid flow, such that details can be fed into FE from CFD as a starting condition. The key outputs of residual stress and distortions predicted by the FE model can then be monitored against the process variables input to the model. Further, a link between the thermal results and the microstructural properties is of interest. Therefore, an empirical relationship between lamellar spacing and the cooling rate was developed and used to make predictions about the lamellar spacing for welds of different process parameters. Processing parameter combinations that lead to regions of high residual stress formation and high distortion have been determined, and the impact of processing parameters upon the predicted lamellar spacing has been presented.

show abstract

“…[26,27] Furthermore, it is possible to calculate the heat loss at the interface due to evaporation (the mathematical description is shown in Eq. [9] as the last term of Q loss ).…”

Section: H(tb)mentioning

confidence: 99%

“…Different numerical models could be used to describe the physics of gas-liquid interfaces, especially for laser melt pools; the volume-of-fluid, [6] Lagrangian-Euler, [7] and level set [8] methods are among the most popular. The latter method was used to describe the keyhole development of iron treatment, [9] the cladding of stainless steel, [10] and solidification. [11] II.…”

Section: Introductionmentioning

confidence: 99%

Marangoni Convection during Free Electron Laser Nitriding of Titanium

Höche

Müller

Rapin³

et al. 2009

Metall Mater Trans B

View full text Add to dashboard Cite

Pure titanium was treated by free electron laser (FEL) radiation in a nitrogen atmosphere. As a result, nitrogen diffusion occurs and a TiN coating was synthesized. Local gradients of interfacial tension due to the local heating lead to a Marangoni convection, which determines the track properties. Because of the experimental inaccessibility of time-dependent occurrences, finite element calculations were performed, to determine the physical processes such as heat transfer, melt flow, and mass transport. In order to calculate the surface deformation of the gasliquid interface, the level set approach was used. The equations were modified and coupled with heat-transfer and diffusion equations. The process was characterized by dimensionless numbers such as the Reynolds, Peclet, and capillary numbers, to obtain more information about the acting forces and the coating development. Moreover, the nitrogen distribution was calculated using the corresponding transport equation. The simulations were compared with crosssectional micrographs of the treated titanium sheets and checked for their validity. Finally, the process presented is discussed and compared with similar laser treatments.

show abstract

Modelling of high-density laser-material interaction using fast level set method

Cited by 114 publications

References 28 publications

Modeling laser drilling in percussion regime using constraint natural element method

Modeling laser drilling in percussion regime using constraint natural element method

An Integrated Modeling Approach for Predicting Process Maps of Residual Stress and Distortion in a Laser Weld: A Combined CFD–FE Methodology

Marangoni Convection during Free Electron Laser Nitriding of Titanium

Contact Info

Product

Resources

About