It is well known that the welding process induces residual stresses near the bead toe. These stresses could influence the high cycle fatigue strength of welding joints therefore it is very important to know their distribution. Among the local criteria, the Notch-Stress Intensity Factors (N-SIFs) method considers the weld toe like a sharp V- notch and estimates the fatigue strength according to the asymptotic stress distribution near the bead toe. Such distribution is evaluated taking into account only the external applied loads [1]. It is obvious that the residual stresses change such distribution and the size of the plastic zone near the weld toe, modifying the range of validity of a linear- elastic hypothesis. The aim of this work is to analyse, by means of a numerical model of a T-joint, the residual stress distribution near the toe due to a welding process. The 2002®.
RESIDUAL STRESS DISTRIBUTION NEAR THE WELD TOE OF T-JOINTS
FERRO, PAOLO;BERTO, FILIPPO
2004
Abstract
It is well known that the welding process induces residual stresses near the bead toe. These stresses could influence the high cycle fatigue strength of welding joints therefore it is very important to know their distribution. Among the local criteria, the Notch-Stress Intensity Factors (N-SIFs) method considers the weld toe like a sharp V- notch and estimates the fatigue strength according to the asymptotic stress distribution near the bead toe. Such distribution is evaluated taking into account only the external applied loads [1]. It is obvious that the residual stresses change such distribution and the size of the plastic zone near the weld toe, modifying the range of validity of a linear- elastic hypothesis. The aim of this work is to analyse, by means of a numerical model of a T-joint, the residual stress distribution near the toe due to a welding process. The 2002®.Pubblicazioni consigliate
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