Rapid calculations of notch stress intensity factors based on averaged strain energy density from coarse meshes: Theoretical bases and applications

2010 ◽  
Vol 32 (10) ◽  
pp. 1559-1567 ◽  
Author(s):  
Paolo Lazzarin ◽  
Filippo Berto ◽  
Michele Zappalorto
Keyword(s):  
Stress Intensity ◽  
Energy Density ◽  
Stress Intensity Factors ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Intensity Factors ◽  
Notch Stress ◽  
Notch Stress Intensity Factors ◽  
Coarse Meshes

scholarly journals Residual Notch Stress Intensity Factors in Welded Joints Evaluated by 3D Numerical Simulations of Arc Welding Processes

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 812
Author(s):  
Alberto Campagnolo ◽  
Paolo Ferro ◽  
Luca Romanin ◽  
Giovanni Meneghetti
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Welded Joints ◽  
Welding Process ◽  
Intensity Factors ◽  
Notch Stress ◽  
Weld Toe ◽  
Notch Stress Intensity Factors ◽  
Coarse Meshes ◽  
Welding Processes

Approaches based on calculating Residual Notch Stress Intensity Factors (R-NSIFs) assume the weld toe to be a sharp V-notch that gives rise to a residual singular stress distribution close to the weld toe. Once R-NSIFs are determined, they might be included in local fatigue criteria for the structural strength assessment of welded joints based on NSIFs due to external cyclic loading. However, the numerical calculation of R-NSIFs through finite element (FE) simulations of the welding process requires extremely refined meshes to properly capture the residual stress singularity. In this context, the Peak Stress Method (PSM) has recently been adopted to estimate R-NSIFs due to residual stresses by means of coarse meshes of 2D 4-node plane or 3D 8-node brick elements. The aim of this work is to investigate the applicability of the PSM to estimate R-NSIFs in a butt-welded joint using coarse meshes of 3D 10-node tetra elements. The R-NSIF distribution at the weld toe line is estimated by applying the PSM to coarse meshes of 3D 10-node tetra elements, and the results are in agreement with those obtained using 3D 8-node brick elements. Accordingly, the PSM based on tetra elements further enhances the rapid estimation of R-NSIFs using coarse meshes and could be effective in analyzing complex 3D joint geometries.

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