Abstract
A method for the determination of weight functions relevant to welded joints and subsequent calculation of stress intensity factors is presented. The weight function for edge cracks emanating from the weld toe in a T-butt welded joint has been derived by using the Petroski-Achenbach crack opening displacement function. The weight function makes it possible to study efficiently the effect of weld profile parameters, such as the weld toe radius and weld angle, on stress intensity factors corresponding to different stress systems.
The method enables relatively easy calculations of stress intensity factors for welded T-butt joints for a variety of geometry and loading configurations. It was also found that the local weld geometric parameters affect the stress intensity factor more than the local stress fields in the weld toe neighbourhood.
Résumé
On présente une méthode de détermination des fonctions pondérées relatives à des joints soudés, et de calcul subséquent de facteurs d'intensité de contrainte.
Dans le cas de fissure de bords émanant de la racine de la soudure dans un joint d'angle, la fonction pondérée a été déterminée en utilisant la fonction COD de Petroski-Achenbach. Cette fonction permet détudier de manière efficace les effets des paramètres géométriques afférant au profil de la soudure, tels que le rayon à la racine et l'angle du cordon, sur les facteurs d'intensité de contraintes correspondant à diverses conditions de sollicitation.
La méthode permet de procéder à des calculs relativement simples des facteurs d'intensité de contraintes pour ce type de soudures, pour différentes géométries et configurations de mise en charge.
On trouve également que les paramètres de géométrie locale d'une soudure ont une influence plus prononcée sur le facteur d'intensité de contrainte que les champs de contraintes locales qui règnent dans la région de sa racine
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Niu, X., Glinka, G. The weld profile effect on stress intensity factors in weldments. Int J Fract 35, 3–20 (1987). https://doi.org/10.1007/BF00034531
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DOI: https://doi.org/10.1007/BF00034531