Assessment of Welded Structures by a Local Multiaxial Fatigue Approach

Ky Dang Van (1) , André Bignonnet (2) , Jean-Luc Fayard (1) , Jean-Jacques Janosch (3)

1 LMS - Laboratoire de mécanique des solides
2 PSA - PSA Peugeot - Citroën
3 UPVM - Université Paul Verlaine - Metz

A new local multiaxial computing method for the fatigue assessment of welded structures is presented. This approach is based on the use of an equivalent stress derived from the multiaxial fatigue criterion proposed by Dang Van for plain machined specimens. Application to fillet welds allows a better description of the influence of local geometries and residual stress states. These factors are related to the weld process and the quality of the weld. This approach, associated with definite shell finite element meshing rules in order to take account of the increase of local rigidity introduced by the weld, is also successfully used to assess the fatigue resistance of welded automotive structures.

Mots clés: fatigue of welded structures; multiaxial computing methods

Domaines: Mécanique [physics.med-ph]

Ky Dang Van, André Bignonnet, Jean-Luc Fayard, Jean-Jacques Janosch. Assessment of Welded Structures by a Local Multiaxial Fatigue Approach. Fatigue and Fracture of Engineering Materials and Structures, 2001, 24 (5), pp.369-376. ⟨10.1046/j.1460-2695.2001.00399.x⟩. ⟨hal-00111337⟩