Laser Ablation

Laser application

Significance:

laser ablation has been widely used in laser machining, thin film deposition, carbon nanotube production, nanoparticle production, medical surgery, chemical analysis, and ablative propulsion.
However "laser ablation is still largely unexplored at the fundamental level". ------J. C. Miller & R. F.Haglund, Laser Ablation and Desorption. Academic, New York, 1998.
The understanding and modeling of laser radiation and laser-induced plasmas on solid materials are essential to the development of laser-based advanced manufacturing and other related technologies.

Fig. 1. Demonstration of modeling laser ablation with ABAQUS using coupled thermal displacement step, UMESHMOTION subroutine, and ALE arbitrary remeshing.

Research Highlights:

Developed a thermal model for nanosecond pulsed laser ablation of aluminum considering moving front with finite element analysis in ABAQUS.
Developed a novel numerical approach that enables us to model pulsed laser ablation for laminated composite materials using a MATLAB-ABAQUS integrated numerical procedure.
Used Polynomial Chaos Expansion (PCE) method to quantify the uncertainty of temperature-dependent absorption coefficient for modeling nanosecond pulsed laser ablation.
Laser ablation tests were performed to investigate the laser and laser-induced plasma effects on the ablation of metallic materials.

Publication List:

Y. Wang, N. Shen, G. K. Befekadu & C. L. Pasiliao (2017). Modeling Pulsed Laser Ablation of Aluminum with Finite Element Analysis Considering Material Moving Front, Int. J. of Heat and Mass Transfer, Vol. 113, pp. 1246-1253.
Y. Wang & C. L. Pasiliao (2018), Modeling Ablation of Laminated Composites: A Novel Manual Mesh Moving Finite Element Analysis Procedure with ABAQUS, Int. J. of Heat and Mass Transfer, Vol. 116, pp. 306-313.
Y. Wang, G. K. Befekadu, H. Ding & D. W. Hahn (2018), “Uncertainty Quantification for Modeling Pulsed Laser Ablation of Aluminum Considering Uncertainty in the Temperature-dependent Absorption Coefficients,” Int. J. of Heat and Mass Transfer, Vol. 20, pp. 515–522.
Y. Wang, D. Díaz & D. W. Hahn, Ablation characteristics of nanosecond pulsed laser ablation of aluminum, to appear 2018 ASME IMECE conference, November 9-15, 2018, Pittsburgh, PA, USA

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