الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 173 |  |  |
| | | from | 173 | | |
Abstract
Welding is frequently used in many structures and some machine parts cracks with different lengths are often induced in weld metal (WM)heat affected zone (HAZ) or both, which is not usually allowed in welding standards .
The computation of the stress intensity factoring the opening mode ”k” for welded joints is needed to assure that the joint can as sustain the working loads the displacement extrapolation method and j-integral technique have been adopted for this computation a 9 node isoperimetric finite element analysis has been developed with the necessary data generators three test cases, namely, central crack under uniform tension and edge crack or three point bending have been checked and compared with available theoretical solutions and good agreement has been detected besides.
Practical cases of butt-and fillet joints under transverse uniform tension, with or without reinforcement (single or double), have been examined. In general ”k” increase with the increase in crack length while, reinforcement reduces K in fillet joints, the K decreases with the increase in leg length, the presence of crack influence stresses only in the vicinity of the crack tip.