Fatigue crack growth in welded S355 specimens subjected to combined loadings

Abstract

The paper presents the results of experimental fatigue tests performed on welded S355 specimens subjected to combined bending and torsion loading. In order to analyse how the fillet joints' shape and the load ratio affect the crack growth, we selected two kinds of fillet shape: concave and convex, and two load ratios, namely R =-1, 0. Rectangular specimens with stress concentrators in the form of the external two-sided blunt notches and fillet welded joint were tested. The test results were compared to experiments conducted on solid specimens without welds.

Fatigue Crack Growth in Welded S355 Samples Subjected to Bending Loading

“…The experimental tests were carried out on samples welded without heat treatment and on samples after two different heat treatments. The first heat treatment was performed by subjecting the samples to annealing at the temperature of 630 • C for 2 h. However, the second heat treatment consisted of normalizing annealing at the temperature of 940 • C for 1.1 h [8][9][10][11][12][13][14][15]. Geometries of the tested samples are presented in Figure 1.…”