SEDL / STP / STP770-EB / STP32435S

Low-Cycle Fatigue Behavior of Welded Joints in High-Strength Steels

Lieurade, H-P
Engineer, Institut de Recherches de la Sidérurgie Française, Saint-Germain-en-Laye,

Maillard-Salin, C
Engineer, Institut de Recherches de la Sidérurgie Française, Saint-Germain-en-Laye,

Pages: 26    Published: Jan 1982

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Abstract

Low-cycle fatigue tests are carried out on different types of welded joints in structural steels. The low-cycle fatigue strength of welded joints depends on the weld geometry and the weld toe quality. The influence of these parameters and the role of the microstructure on low-cycle fatigue are discussed. For cruciform joints, the weld toe ground increases the low-cycle fatigue strength. The butt joints present a higher fatigue strength, and this fatigue strength increases when the weld reinforcement decreases. Submerged arc welded butt joints (presenting small reinforcement) have the same low-cycle fatigue strength as as-rolled base metal. The test results are expressed as a function of different fatigue notch factors.