The Influence of Peening on the Fatigue Behavior of Flat Plates and Tubular Joints Made of Coarse Grained Material

Author:  Dijkstra, deKoning, Drenth, Benelux
Source:  SAE: 864283
Doc ID:  1986006
Year of Publication:  1986
Abstract:  
Fatigue tests were carried out on flat welded plates made of fine and coarse grained material and on welded tubular joints made of coarse grained material. The weld toes of all types of specimens were tested in the as welded and in peened condition. As welded coarse grained plate specimens have a reduced fatigue life in relation to fine grained specimens. Peening delays crack initiation and therefore gives a longer fatigue life. Peened tubular joints of coarse grained material have only 75% of the fatigue lifetime of normal fine grained tubular joints. Descriptors: Plate metal-- Mechanical properties; Tube joints-- Mechanical properties; Welded joints-- Mechanical properties; Fatigue life-- Deformation effects; Crack initiation-- Deformation effects; Shot peening; Grain size