slovenski

Factors influencing the yielding constraint for cracked welded components

The effect of strength mis-match by welded joints performed with different geometry on the yielding constraint has been investigated in the context of single edged fracture toughness specimen subjected to bending SE(B) using the finite element method. The crack was located in the centre of the weld. Two geometrical parameters have been identified as most important: crack length ratio a/W as well as slenderness of the welded joint (W-a)/H. They are systematically varied as follows: a/W=0, 1 ; 0, 2 ; 0, 3 ; 0, 4 ; 0, 5 and W=2H, 4H, 8H, 16H, 24H. Basic equations and plane strain finite element solutions for the overmatched SE(B) specimen with all configuration combinations are given. The results are in good agreement with those in literature. This paper aims to establish yield load solutions for the same weldment configurations, but with present materials dissimilarity within the weld, usually a situation found at repair welding. To this purpose, practical combination of filler materials, with the same portion of overmatched part with M=1, 19 and undermatched part with M=0, 86, has been selected. Plane strain solutions for the heterogeneous weld with the crack located in the overmatched halve were obtained. The influence of the yielding constraint key parameters has been also evaluated. Yield load results for the specimens performed with different weld width have the greatest scattering for the a/W=0, 5. The transition from the overmatch to undermatch solution with increasing H is evident. On the other hand, the behaviour of the specimen with shallow crack is dictated by the overmatch region ahead the crack tip and depends very little on the weld slenderness. An approximated 3-D area of yield load solutions depending on a/W and (W-a)/H has been proposed. Furthermore, the stress triaxility parameter h has been calculated by 2-D and 3-D finite element analysis and given as field in specimen to get an insight into yielding constraint regions. It is found that the 3-D yield load solutions are very close to the plane strain solutions. Also, the effect of a/W on the yielding constraint is more significant than the effect of M and (W-a)/H.

SE(B) specimen; welded joint; crack; yielding load; yielding constraint parameters

nije evidentirano

engleski

Factors influencing the yielding constraint for cracked welded components

The effect of strength mis-match by welded joints performed with different geometry on the yielding constraint has been investigated in the context of single edged fracture toughness specimen subjected to bending SE(B) using the finite element method. The crack was located in the centre of the weld. Two geometrical parameters have been identified as most important: crack length ratio a/W as well as slenderness of the welded joint (W-a)/H. They are systematically varied as follows: a/W=0, 1 ; 0, 2 ; 0, 3 ; 0, 4 ; 0, 5 and W=2H, 4H, 8H, 16H, 24H. Basic equations and plane strain finite element solutions for the overmatched SE(B) specimen with all configuration combinations are given. The results are in good agreement with those in literature. This paper aims to establish yield load solutions for the same weldment configurations, but with present materials dissimilarity within the weld, usually a situation found at repair welding. To this purpose, practical combination of filler materials, with the same portion of overmatched part with M=1, 19 and undermatched part with M=0, 86, has been selected. Plane strain solutions for the heterogeneous weld with the crack located in the overmatched halve were obtained. The influence of the yielding constraint key parameters has been also evaluated. Yield load results for the specimens performed with different weld width have the greatest scattering for the a/W=0, 5. The transition from the overmatch to undermatch solution with increasing H is evident. On the other hand, the behaviour of the specimen with shallow crack is dictated by the overmatch region ahead the crack tip and depends very little on the weld slenderness. An approximated 3-D area of yield load solutions depending on a/W and (W-a)/H has been proposed. Furthermore, the stress triaxility parameter h has been calculated by 2-D and 3-D finite element analysis and given as field in specimen to get an insight into yielding constraint regions. It is found that the 3-D yield load solutions are very close to the plane strain solutions. Also, the effect of a/W on the yielding constraint is more significant than the effect of M and (W-a)/H.

SE(B) specimen; welded joint; crack; yielding load; yielding constraint parameters

nije evidentirano