The WELFARE Local Strain Method has been recently proposed by the present authors to evaluate the fatigue strength of welded component made of structural steel, of whichever geometry and subjected to any load ratio ranging from -1 to 0.5. The new method exhibit different behavior of joints made of thin plates (3–5 mm) with respect of those made of thick plates (10–25 mm). The strength fatigue limit curve obtained for thin joints is simply translated and above than the limit curve obtained for 10-25 mm thick joints. This different behavior is in all likelihood due to the effects produced by the thermal welding cycle, which results in large rotations in thin plates and high residual stresses in thick plates. This work aims to shed light on the effect of residual stresses on fatigue life prediction obtained by means of the Welfare method. Measures on a numerous set of representative specimens are carried out and the effects on fatigue life prediction obtainedt through the measures of local deformation have been then evaluated.
The Welfare Method and Relaxed Welded Plates, Revue Internationale d'Ingénierie des Systèmes de Production Mécanique
NOBILE, RICCARDO;
2004-01-01
Abstract
The WELFARE Local Strain Method has been recently proposed by the present authors to evaluate the fatigue strength of welded component made of structural steel, of whichever geometry and subjected to any load ratio ranging from -1 to 0.5. The new method exhibit different behavior of joints made of thin plates (3–5 mm) with respect of those made of thick plates (10–25 mm). The strength fatigue limit curve obtained for thin joints is simply translated and above than the limit curve obtained for 10-25 mm thick joints. This different behavior is in all likelihood due to the effects produced by the thermal welding cycle, which results in large rotations in thin plates and high residual stresses in thick plates. This work aims to shed light on the effect of residual stresses on fatigue life prediction obtained by means of the Welfare method. Measures on a numerous set of representative specimens are carried out and the effects on fatigue life prediction obtainedt through the measures of local deformation have been then evaluated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
