Abstract
The effect of plate thickness on the fatigue behaviour of V-notched plate specimens, with geometry simulating 19.5 and 39.0 mm thick welded joints, tested in air with constant amplitude loading under four-point bending was investigated. Fatigue crack growth was monitored using a multiple-probe ACPD technique. Test results are discussed in terms of S-N, life-thickness and strength-thickness plots. Crack growth results are evaluated using fracture mechanics. The thickness effect for these specimens without residual stress or welding defects is comparable with results reported in the literature for welded joints. This suggests that the thickness effect for welded joints is primarily due to geometrical factors.
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