Bestimmung zyklischer Werkstoffkennwerte für Schweißnähte basierend auf der Härte

Abstract

For fatigue strength verification in the low cycle fatigue for welds, it is necessary to consider elastic-plastic material behaviour. For this purpose, cyclic material properties can be determined experimentally or estimated from static material properties. The experimental determination of weld seams is possible only with very high effort, because no homogeneous specimens can be taken out of weld seams. For the same reason it is not possible to estimate the cyclic characteristic values from the tensile strength. Instead the microhardness of the different areas of the base metal, heat-affected zone and weld metal can be measured using the Vickers method and from this the cyclic properties for the different weld seam areas can be estimated. Various existing estimation methods are investigated and modified for the Vickers hardness input parameter