TY - CONF

T1 - Service Strength Assessment of Macroscopic Imperfections in Cast Steel Alloys

AU - Stoschka, Michael

AU - Horvath, Michael

AU - Mössler, Werner

AU - Grun, Florian

PY - 2024/6/13

Y1 - 2024/6/13

N2 - As macroscopic imperfections can be locally treated as notches, it is advisable to useestablished notch fatigue concepts to deduce the service strength of defect-afflicted cast steelalloys. Recently, an advanced local fatigue assessment method has been developed withinthe CD-Laboratory for ‘Manufacturing Process based Component Design’ at the Chair ofMechanical Engineering, Montanuniversität Leoben. This design procedure bases on the“Total Strain Energy Density” method (T-SED) and features a probabilistic assessment ofplanar defect projections. The method has been validated for large-scale, defect afflicted,specimens under constant amplitude loading. This contribution addresses the operationalstrength as variable amplitude loading for cast steel G12MnMo7-4+QT. In total, forty variableamplitude load tests were carried out covering block-load sequences as well as service-loadsignals from railway bogie measurements. It is demonstrated that the T-SED method is wellapplicable to calculate the service strength of cast steel samples under variable, uniaxialloading for varying bulk defect geometries. A damage sum of D = 0.3 is recommendable tomeet the design limit curve of the investigated high-strength cast steel alloy.

AB - As macroscopic imperfections can be locally treated as notches, it is advisable to useestablished notch fatigue concepts to deduce the service strength of defect-afflicted cast steelalloys. Recently, an advanced local fatigue assessment method has been developed withinthe CD-Laboratory for ‘Manufacturing Process based Component Design’ at the Chair ofMechanical Engineering, Montanuniversität Leoben. This design procedure bases on the“Total Strain Energy Density” method (T-SED) and features a probabilistic assessment ofplanar defect projections. The method has been validated for large-scale, defect afflicted,specimens under constant amplitude loading. This contribution addresses the operationalstrength as variable amplitude loading for cast steel G12MnMo7-4+QT. In total, forty variableamplitude load tests were carried out covering block-load sequences as well as service-loadsignals from railway bogie measurements. It is demonstrated that the T-SED method is wellapplicable to calculate the service strength of cast steel samples under variable, uniaxialloading for varying bulk defect geometries. A damage sum of D = 0.3 is recommendable tomeet the design limit curve of the investigated high-strength cast steel alloy.

M3 - Paper

T2 - VAL5<br/>Fifth International Conference on Material and Component Performance<br/>under Variable Amplitude Loading

Y2 - 11 June 2024 through 13 June 2024

ER -