The use of cyclic DJ q as a parameter for fatigue initiation of X52 steel

Julien Capelle (1) , J Predan , N Gubeljak , G Pluvinage

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux

The concept of DJ cyclic has been extended to fatigue initiation emanating from notch. The parameter is then named DJ q. Validation of this parameter is made by fatigue tests made on Roman tile specimens made in X52 pipe steel. Here, fatigue initiation is detected by acoustic emission. It has been found that the fatigue initiation decreases after hydrogen absorption. This can be explained by interaction of hydrogen and plasticity as can be seen for tensile and fracture behaviour of X52 steel after introduction of hydrogen.

Domaines: Génie mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]

Julien Capelle, J Predan, N Gubeljak, G Pluvinage. The use of cyclic DJ q as a parameter for fatigue initiation of X52 steel. Engineering Fracture Mechanics, 2012, ⟨10.1016/j.engfracmech.2012.07.023⟩. ⟨hal-02972381⟩