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Abstract:
The shot
peening process is simulated by FEM using ABAQUS codes. The 3D linear
reduced-integration elements are used to predict residual stress fields
in the weldments peend by glass beads and steel shots under the same
Almen intensity. The effect of Hourglass, dynamic hardening of target
material, peening coverage and initial residual stress induced by
welding are considered during the simulations. It can been seen from the
results that steel-shots peening can produce deeper compressive residual
stress layer, but in the condition of higher peening coverage
glass-beads peening results in higher average residual compressive
stress on the surface of weldments than steel shots. Numerical results
also show that a residual compressive stress layer could be produced by
shot peening even if there are welding residual tensile stresses
existing in the weldments. Therefore, shot peening is an effective
method for protecting weldments against stress corrosion crack. The
above results provide the basis for studying the mechanism on prevention
of stress corrosion cracking in weld joint of 304 type stainless steel
by shot peening.
Key words: Shot
peening Finite element simulation Residual stress field
CLC No: TG113
江苏省自然科学基金资助项目(BK2001098).Received
20050810,received in revised form 20060310
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