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Title: Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water

Abstract

In laser shock peening (LSP) under a water-confinement regime, laser-matter interaction near the coating-water interface can induce very high pressures in the order of gigapascals, which can impart compressive residual stresses into metal workpieces to improve fatigue and corrosion properties. For axisymmetric laser spots with finite size, the pressure generation near the water-coating interface is a two dimensional process in nature. This is in particular the case for microscale LSP performed with very small laser spots, which is a very promising technique to improve the reliability performance of microdevices. However, models capable of predicting two dimensional (2D) spatial distributions of the induced pressures near the coating-water interface in LSP have rarely been reported in literature. In this paper, a predictive 2D axisymmetric model is developed by numerically solving the hydrodynamic equations, supplemented with appropriate equations of state of water and the coating material. The model can produce 2D spatial distributions of material responses near the water-coating interface in LSP, and is verified through comparisons with experimental measurements. The model calculation shows that the effect of radial release wave on pressure spatial distributions becomes more significant as the laser spot size decreases, indicating the importance of a 2D model, particularly formore » microscale LSP.« less

Authors:
;  [1]
  1. Center for Laser-based Manufacturing, Purdue University, West Lafayette, Indiana 47907 (United States)
Publication Date:
OSTI Identifier:
20982886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 10; Other Information: DOI: 10.1063/1.2734538; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AXIAL SYMMETRY; COATINGS; CORROSION; EQUATIONS OF STATE; FATIGUE; HYDRODYNAMICS; INTERFACES; LASER MATERIALS; LASERS; METALS; PRESSURE DEPENDENCE; RESIDUAL STRESSES; SHOT PEENING; SIMULATION; SPATIAL DISTRIBUTION; TWO-DIMENSIONAL CALCULATIONS; WATER

Citation Formats

Wu, Benxin, and Shin, Yung C. Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water. United States: N. p., 2007. Web. doi:10.1063/1.2734538.
Wu, Benxin, & Shin, Yung C. Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water. United States. doi:10.1063/1.2734538.
Wu, Benxin, and Shin, Yung C. Tue . "Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water". United States. doi:10.1063/1.2734538.
@article{osti_20982886,
title = {Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water},
author = {Wu, Benxin and Shin, Yung C.},
abstractNote = {In laser shock peening (LSP) under a water-confinement regime, laser-matter interaction near the coating-water interface can induce very high pressures in the order of gigapascals, which can impart compressive residual stresses into metal workpieces to improve fatigue and corrosion properties. For axisymmetric laser spots with finite size, the pressure generation near the water-coating interface is a two dimensional process in nature. This is in particular the case for microscale LSP performed with very small laser spots, which is a very promising technique to improve the reliability performance of microdevices. However, models capable of predicting two dimensional (2D) spatial distributions of the induced pressures near the coating-water interface in LSP have rarely been reported in literature. In this paper, a predictive 2D axisymmetric model is developed by numerically solving the hydrodynamic equations, supplemented with appropriate equations of state of water and the coating material. The model can produce 2D spatial distributions of material responses near the water-coating interface in LSP, and is verified through comparisons with experimental measurements. The model calculation shows that the effect of radial release wave on pressure spatial distributions becomes more significant as the laser spot size decreases, indicating the importance of a 2D model, particularly for microscale LSP.},
doi = {10.1063/1.2734538},
journal = {Journal of Applied Physics},
number = 10,
volume = 101,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}