Thermal and thermomechanical phenomena in laser metal interaction are of great importance in terms of understanding the underlying mechanisms in laser materials processing, optimizing the efficiency of laser micro-machining, and minimizing laser induced damage. In this work, Molecular Dynamics (MD) simulation is carried out to investigate picosecond laser copper interaction. A method has been developed to account for the laser beam absorption in, and the thermal transport sustained by, free electrons. Superheating is observed, and an evident temperature drop is revealed at the solid-liquid interface, which moves at a speed of 4400 m/s. However, the later phase change from solid to liquid happens in the target simultaneously and no visible movement of solid-liquid interface is observed. The results show that the laser induced stress wave consists of a strong compressive stress and a weak tensile stress. After reflection at the back side of the MD domain, the strong compressive stress becomes a strong tensile stress, which results in a visible drop of the number density of atoms. In the presence of this strong tensile stress, voids have formed in the region near the back side of the MD domain, indicating that the strong tensile stress in laser materials interaction plays an important role in terms of inducing structural damage.
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Technical Papers
Thermal and Thermomechanical Phenomena in Picosecond Laser Copper Interaction
Xinwei Wang
e-mail: xwang3@unl.edu
Xinwei Wang
Department of Mechanical Engineering, N104 Walter Scott Engineering Center, The University of Nebraska at Lincoln, Lincoln, Nebraska 68588-0656
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Xinwei Wang
Department of Mechanical Engineering, N104 Walter Scott Engineering Center, The University of Nebraska at Lincoln, Lincoln, Nebraska 68588-0656
e-mail: xwang3@unl.edu
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division March 31, 2003; revision received January 21, 2004. Associate Editor: C. P. Grigoropoulos.
J. Heat Transfer. Jun 2004, 126(3): 355-364 (10 pages)
Published Online: June 16, 2004
Article history
Received:
March 31, 2003
Revised:
January 21, 2004
Online:
June 16, 2004
Citation
Wang, X. (June 16, 2004). "Thermal and Thermomechanical Phenomena in Picosecond Laser Copper Interaction ." ASME. J. Heat Transfer. June 2004; 126(3): 355–364. https://doi.org/10.1115/1.1725092
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