Investigations of Stress State in Cracked Steel Specimens and Wide Plates Containing Laser Beam Welds

摘要

The results of combined experimental investigations and 3D-FE analysis on pre-cracked fracture mechanics steel specimens and wide plates with overmatching laser beam weldments (LBW) under quasi-static loading will be presented. From fracture mechanics experiments the crack initiation has been obtained. At these points stresses and strains for the loading state at crack initiation were determined in the FE analysis. Analysing the stress state, the occurring pop-ins in fracture mechanics testing in comparison to the wide plate behaviour could be explained. Further it was found that the tendency for the often observed crack path deviation in LBW is increased at higher loads. The constraint in the plate with LBW can be estimated by evaluation of the homogenous material configuration conservatively, especially for higher loads.