Effect of Residual Stresses on the Fatigue Crack Propagation in Welded Joints

Gubeljak, N
University of Maribor, Maribor, Slovenia

Predan, J
University of Maribor, Maribor, Slovenia

Pippan, R
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria

Oblak, M
University of Maribor, Maribor, Slovenia

(Received 21 January 2004; accepted 4 May 2004)
JOURNAL JAI
Abstract
The effect of residual stress on the fatigue crack growth was investigated for cyclic tension. Three-point bend specimens were used with through thickness notches at the center line of the welded joint. The experiments were performed for different load amplitudes and load ratios under conditions of small-scale yielding. The influence of the residual stresses on fatigue crack growth was estimated by experimentally observed fatigue crack growth rate and measurement of residual stresses at the surface of specimen. This paper describes an approach taken in two models to estimate the residual stress effect on fatigue crack propagation and to predict remaining service life of a welded structure.

Keywords:
fatigue, fatigue crack growth rate, fatigue crack propagation, residual stresses, X-ray

Paper ID: JAI12036
DOI: 10.1520/JAI12036

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Author Gubeljak, N Affiliation University of Maribor, Maribor, Slovenia Author Predan, J Affiliation University of Maribor, Maribor, Slovenia Author Pippan, R Affiliation Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria Author Oblak, M Affiliation University of Maribor, Maribor, Slovenia Title: Effect of Residual Stresses on the Fatigue Crack Propagation in Welded Joints Symposium: Fatigue and Fracture Mechanics: 34th Volume, 2003-11-21
Committee: E08 on Fatigue and Fracture