engleski

Finite element model of welded joint with crack-tip in the heat affected zone

The possibility of failure of welded structures is depending on fracture mechanics properties of weld joints. The aim of this paper was to determine appropriate numerical model to simulate the experimental evaluation of fracture mechanics specimens. To this purpose, standard BxB single edge notch bend (SENB) three points bend (TPB) specimens made with surface notch tip in the heat affected zone (HAZ) were applied. The X-grooved welded joint is homogenous with the strength higher then base material (overmatching). The comparison between numerical and known experimental results is done by using measured values of fracture behaviour as are crack tip opening displacement (CTOD), load line displacement (LLD) and crack mouth opening displacement (CMOD). The finite elements results shown that using of described numerical procedure for threshold determination of safe load for real welded different structures is possible.

high strength steels; welded joint; strength mismatching; finite element method; crack; fracture mechanics

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