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Title: The Effect of Incidence Angle on Residual Stress State In Laser Peened Ti-6Al-4V Plate
Author: Evans, King, Pirling, Bruno, Withers
Source: Conf Proc: ICSP-9 (pg 454-459)
Publication year 2005
Document number: 2005124
Number of pages: 6
Abstract:
ABSTRACT
Residual stress was determined by neutron diffraction in laser shock peened Ti-6Al-4V ~8mm flat plate samples treated at several angles of incidence of the laser beam
(namely 85°, 42° and 30°). The stresses in the two principal in-plane directions were determined non-destructively as a function of depth from the peened to the rear
surface. This was possible by neutron diffraction using radial collimators to define the sampling gauge volume. The plane stress assumption was made in converting strain to
stress. A preliminary scan showed that the stress tensor did not rotate as the laser incident angle was varied. The results show that laser shock peening generates a
compressive residual stress to a depth of around 1.5 mm, balanced by tensile stresses beneath this region. For the sample peened at the near normal incidence (85°), the
in-plane stress state is nearly isotropic. The data indicate that provided the energy input per unit area is largely the same, the stress profiles are insensitive to the
angle of incidence, except at the very near surface for which the compressive stress is greater parallel to the extended footprint dimension for lower angles of incidence.
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