Finite element analysis of laser shock peening of 2050-T8 aluminum alloy

Laser shock peening has become a commonly applied industrial surface treatment, particularly for high-strength steel and titanium components. Effective application to aluminum alloys, especially in the thin sections common in aerospace structures, has proved more challenging. Previous work has shown that some peening conditions can introduce at-surface tensile residual stress in thin Al sections. In this study, we employ finite element modeling to identify the conditions that cause this to occur, and show how these adverse effects can be mitigated through selection of peen parameters and patterning.

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Fabrication and Finite Element Analysis of Micro Dents Using μ-Laser Shock Peening

ASME 2008 International Manufacturing Science and Engineering Conference, Volume 1 ◽

10.1115/msec_icmp2008-72231 ◽

2008 ◽

Author(s):

Michael P. Sealy ◽

Y. B. Guo ◽

M. F. Horstemeyer

Keyword(s):

Finite Element ◽

Laser Pulse ◽

Pulse Duration ◽

Laser Shock Peening ◽

Direct Write ◽

Laser Shock ◽

Element Analysis ◽

Element Simulation ◽

Shock Peening ◽

Peak Pressures

Laser shock peening (LSP) is an innovative surface treatment developed to improve surface integrity. This study explores the feasibility using LSP to direct-write surface micro dents for lubricant retention. Since LSP is a highly transient process with a pulse duration of 10 – 100 ns, a real time in-situ measurement of laser/material interaction such as transient stresses/strains is challenging. Therefore, a 3D finite element simulation of micro-scale laser shock peening was developed to determine the effect of laser pulse duration and peak pressure on the transient material behaviors of titanium Ti-6Al-4V. The simulated dent geometry is similar to the measured dent geometry in terms of morphology. The results suggested there is an optimal peening time that produces the deepest dent. The maximum transient stress in peening direction occurred at a certain laser pulse time. However, the stress along the depth and radius were drastically affected by the peak pressures.

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INVESTIGATION OF RESIDUAL STRESS FIELD IN THE CURVED SURFACE OF ROUND ROD SUBJECTED TO MULTIPLE LASER SHOCK PEENING

Surface Review and Letters ◽

10.1142/s0218625x21500293 ◽

2021 ◽

pp. 2150029

Author(s):

XINGQUAN ZHANG ◽

WENWU NIU ◽

YUANDE YIN ◽

JINXIU FANG ◽

SYED SOHAIL AHMAD SHAH ◽

...

Keyword(s):

Residual Stress ◽

Finite Element Analysis ◽

Stress Field ◽

Compressive Residual Stress ◽

Laser Shock Peening ◽

Curved Surface ◽

Laser Shock ◽

Residual Stress Field ◽

Element Analysis ◽

Shock Peening

Laser shock peening (LSP) was employed to squeeze compressive residual stress (CRS) into the curved surface of the round rod with diameter of 16[Formula: see text]mm. The residual stress field was induced by nine laser shots irradiating at different locations along the specified path. The developing process of the residual stress field was investigated with finite element analysis, and the corresponding experiments were also carried out to validate the calculated results. Results demonstrate that multiple LSP with 50% overlapping rate can result in residual stress field with the maximum CRS varying from 155.2[Formula: see text]MPa to 198.8[Formula: see text]MPa along the direction of the rod axis. The peened surface appears wavy in shape and the maximum depth of plastic deformation in the curved surface is 13.41[Formula: see text][Formula: see text]m. The value of surface roughness increases from 3.87[Formula: see text][Formula: see text]m to 4.65[Formula: see text][Formula: see text]m.

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