The present work deals with the numerical assessment of the residual stress fields induced by thermal loads in the proximity of sharp V-notches, as weld-like geometries. According to the notch stress intensity factor (NSIF) approach, the weld bead is modeled as a sharp (zero radius) V-notch. Residual NSIFs (R-NSIFs) are suitable to quantify the intensity of the as- ymptotic stress distributions, close to the weld toe, arising from the solidification of the fused zone during an arc welding process. The direct R-NSIFs determination from the local stress distributions requires meshes very refined in these regions. Here, it is shown how this limitation can be overcome if the R-NSIFs are calculated by means of the strain energy den- sity (SED).
ON THE USE OF THE AVERAGE STRAIN ENERGY DENSITY FOR THE CALCULATION OF RESIDUAL NOTCH STRESS INTENSITY FACTORS
FERRO, PAOLO;COLUSSI, MARCO;BERTO, FILIPPO;
2017
Abstract
The present work deals with the numerical assessment of the residual stress fields induced by thermal loads in the proximity of sharp V-notches, as weld-like geometries. According to the notch stress intensity factor (NSIF) approach, the weld bead is modeled as a sharp (zero radius) V-notch. Residual NSIFs (R-NSIFs) are suitable to quantify the intensity of the as- ymptotic stress distributions, close to the weld toe, arising from the solidification of the fused zone during an arc welding process. The direct R-NSIFs determination from the local stress distributions requires meshes very refined in these regions. Here, it is shown how this limitation can be overcome if the R-NSIFs are calculated by means of the strain energy den- sity (SED).
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