| Popis: |
Within the scope of the research results presented here, the applicability of the structural and notch stress approach is under examination on the basis of different arc welded and dynamically loaded steel structures, taken from the automotive and railway sector. In detail these are a transverse control arm and a crossbeam connection from the underframe of a railcar body. Components and specimens with critical regions of failure are tested under dynamic loading with constant amplitude. With the help of strain gauges, the technical incipient crack is determined. The specimens are the basis for application and evaluation of the different concepts for the assessment of fatigue life. The numerical determination of the nominal, structural and notch stresses is performed with finite-element models. Finally the experimental and computational results allow the derivation of structural and notch Woehler-lines (S-N-curves). |
