This paper deals with the fatigue strength of spot welds investigated by means of an implicit gradient approach. The material is assumed linear elastic and an effective stress for the fatigue life estimation is considered as a transformation of the maximum principal stress field, which is defined by an inhomogeneous Helmholtz equation. The effective stress is calculated by following the same procedure and by using the same characteristic length of the material, previously considered for the fatigue assessments of thick-walled arc welded joints. About 450 experimental data under constant fatigue loading, mainly lap-shear joints, peeling joints, coach-peel joints and shear-bending joints, were analyzed. The experimental data relative to these spot-welded joints, in terms of effective stress, fall into the previous scatter band obtained for transverse fillet welded joints by supplying a possible comprehensive approach to fatigue strength assessment of welded joints.
A numerical approach to fatigue assessment of spot weld joints
TOVO, Roberto;LIVIERI, Paolo
2011
Abstract
This paper deals with the fatigue strength of spot welds investigated by means of an implicit gradient approach. The material is assumed linear elastic and an effective stress for the fatigue life estimation is considered as a transformation of the maximum principal stress field, which is defined by an inhomogeneous Helmholtz equation. The effective stress is calculated by following the same procedure and by using the same characteristic length of the material, previously considered for the fatigue assessments of thick-walled arc welded joints. About 450 experimental data under constant fatigue loading, mainly lap-shear joints, peeling joints, coach-peel joints and shear-bending joints, were analyzed. The experimental data relative to these spot-welded joints, in terms of effective stress, fall into the previous scatter band obtained for transverse fillet welded joints by supplying a possible comprehensive approach to fatigue strength assessment of welded joints.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
