Effect of input variability on the quality of laser shock processing |
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Authors: | Abul Fazal M Arif |
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Affiliation: | 1. Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
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Abstract: | Laser shock processing (LSP) involves high-energy laser radiation combined with suitable overlays to generate high-pressure
pulses on the surface of the metal. The stress wave generated due to high pressure pulses propagates into the material causing
the surface layer to yield and plastically deform, and thereby, develop a significant residual compressive stress in the surface
region of the substrate material. The developed compressive stress field is beneficial to improve surface properties such
as fatigue, wear, and corrosion. To improve the understanding of the shock hardening process, investigation into the physical
processes involved is necessary. In the first part of this paper, the temporal variation in the pressure intensity and spot
size is calculated by using a two-dimensional recoil pressure prediction model. Using an explicit non-linear FEA code, ANSYS
LS-DYNA, the deformation behavior and residual stresses in the substrate material are predicted. In the second part, a probabilistic
approach to the modeling and analysis of LSP is presented in this paper. Various factors that affect the probabilistic performance
of the LSP are grouped into categories and a select number of factors known to be significant, for which the variability could
be assessed, are modeled as random variables (such as recoil pressure, laser beam spot size, substrate material properties
and others). The potential of the probabilistic approach in predicting the structural integrity of the laser-shocked components
is addressed. |
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