Author(s)

P.J. Haagensen

Abstract

The effect of grinding and peening on the fatigue strength of welded T-joints P.J. Haagensen Department of Civil Engineering, The Norwegian Institute of Technology, University of Trondheim, Norway ABSTRACT The fatigue strength properties of welded T-joints improved by toe grinding and a combination of toe grinding and hammer peening are described. Constant amplitude fatigue tests were performed in four point bending on 30 mm thick specimens. Reference S-N curves for as-welded specimens were also established. The steel was a low carbon micro-alloyed steel of 360 MPa yield strength that is commonly used in offshore structures. Information on fatigue lives in terms of cycles to the initiation of a small crack, and total fatigue endurance was obtained in the test program. The results are presented in S-N diagrams and compared with published data from similar tests. INTRODUCTION Grinding and peening are postweld methods that are used frequently to increase the

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