NDLI: Numerical Investigation of Opposing Dual Sided Micro Scale Laser Shock Peening

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Fan, Yajun Wang, Youneng Vukelic, Sinisa Yao, Y. Lawrence
Copyright Year	2006
Abstract	Laser shock peening (LSP) is an innovative process which imparts compressive residual stresses in the processed surface of metallic parts to significantly improve fatigue life and fatigue strength of this part. In opposing dual sided LSP, the workpiece can be simultaneously irradiated or irradiated with different time lags to create different surface residual stress patterns by virtue of the interaction between the opposing shock waves. In this work, a finite element model, in which the hydrodynamic behavior of the material and the deviatoric behavior including work hardening and strain rate effects were considered was applied to predict residual stress distributions in the processed surface induced under various conditions of the opposing dual sided micro scale laser shock peening. Thus the shock waves from each surface will interact in different ways through the thickness resulting in more complex residual stress profiles. Additionally, when treating a thin section, opposing dual sided peening is expected to avoid harmful effects such as spalling and fracture because the pressures on the opposite surfaces of the target balance one another and prohibit excessive deformation of the target. In order to better understand the wave-wave interactions under different conditions, the residual stress profiles corresponding to various workpiece thicknesses and various irradiation times were evaluated.
Sponsorship	Manufacturing Engineering Division
Starting Page	19
Ending Page	28
Page Count	10
File Format	PDF
ISBN	0791847624
DOI	10.1115/MSEC2006-21002
e-ISBN	0791837868
Volume Number	Manufacturing Science and Engineering, Parts A and B
Conference Proceedings	ASME 2006 International Manufacturing Science and Engineering Conference
Language	English
Publisher Date	2006-10-08
Publisher Place	Ypsilanti, Michigan, USA
Access Restriction	Subscribed
Subject Keyword	Fatigue life Deformation Work hardening Irradiation (radiation exposure) Laser hardening Shot peening Fracture (materials) Residual stresses Waves Stress Shock waves Fracture (process) Finite element model Fatigue strength
Content Type	Text
Resource Type	Article

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