Three-dimensional FEM analysis of laser shock peening of aluminium alloy 2024-T351 thin sheets

Abstract

Laser shock peening is a relatively recent technique that introduces compressive residual stresses in metallic structures, improving fatigue, corrosion and wear resistance of treated materials. The purpose of this work is to evaluate numerically the effect of laser shock peening on thin sheets, since most of the numerical analyses available in the literature deal with semi-infinite body assumption, which disregards the reflection of shock waves from the back side of the treated specimen. This phenomenon should be considered when dealing with sheets used for thin walled constructions, for cases in which there is no possibility of using the back-up support, a solid plate in the contact with the backside of the treated sample that limits the wave reflection and deformations. Different set-ups of laser shock peening process are evaluated and an optimal set of parameters is suggested for a possible real structure application.

Numerical simulation of residual stresses fields of DD6 blade during laser shock processing

“…LS-DYNA and ANSYS can be chosen to accomplish full FEM simulation of LSP [14]. A case of a certain type of DD6 blade will be simulated to analyze the dynamic response properties.…”

Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress

“…Eigenstrain approaches have proved useful in predicting residual stress fields in laser‐peened components as a function of geometry and of pre‐existing fields . Finite element calculations confirmed these observations and showed as sheet thickness increased from 3 to 6 mm, surface compressive stress on peened and unpeened faces of thin sheet was predicted to decrease, and was actually greater on the unpeened side.…”

“…There is an emerging consensus on the roles of laser spot diameter, spot overlap, laser energy, and laser spot raster pattern in determining residual stress fields. Increasing laser energy, power density, and coverage all increase the peak subsurface compressive residual stresses.…”

Properties of a Laser Shock Wave in Al-Cu Alloy under Elevated Temperatures: A Molecular Dynamics Simulation Study

“…The other part is a multiple shock wave after the wavefront spreads to the boundaries. The boundaries can lead to rebound shock waves [ 25 ]. This study mainly focus on the single shock wave and, thus, the loading time of 2 ps and 4 ps were selected for study.…”