Title of article :
The effects of process variations on residual stress in laser peened 7049 T73 aluminum alloy
Author/Authors :
Rankin، نويسنده , , Jon E. and Hill، نويسنده , , Michael R. and Hackel، نويسنده , , Lloyd A.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
13
From page :
279
To page :
291
Abstract :
This paper reports measurements of the distribution of residual stress with depth from the surface in laser peened coupons made of a high-strength aluminum alloy. Residual stresses were measured using slitting (also known as the crack compliance method). Measurements were made on several coupons to: compare laser peening (LP) and shot peening (SP) residual stresses; ascertain the influence of LP parameters on residual stress; determine whether tensile residual stress existed outside the peened area; assess the variation of residual stress with in-plane position relative to the layout of the laser spots used for peening; and, determine the importance of a uniform spatial distribution of laser energy within the spot. Residual stress 0.1 mm from the surface due to LP and SP were comparable and the depth of the compressive stress for LP was far greater than for SP. Variations of most LP parameters did not significantly alter residual stress at shallow depths, but greater laser energy and larger layer overlap increased residual stress at depths between 0.2 and 0.6 mm from the surface. Residual stresses adjacent to the peened area were found to be compressive. Decreased levels of surface residual stress were found when laser spots had a non-uniform distribution of laser intensity.
Keywords :
Laser peening , Fatigue , Surface treatment , Residual stress
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2003
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Record number :
2141954
Link To Document :
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