A Numerically Efficient Method to Assess the Elastic–Plastic Strain Energy Density of Notched and Imperfective Cast Steel Components

The fatigue strength of cast steel components is severely affected by manufacturing process-based bulk and surface imperfections. As these defect structures possess an arbitrary spatial shape, the utilization local assessment methods encouraged to design for service strength. This work applies elastic–plastic strain energy density concept study properties a high-strength alloy G12MnMo7-4+QT. A limit curve derived based on non-linear finite element analyses which merges experimental high-cycle results unnotched notched small-scale specimens tested at three different stress ratios into unique narrow scatter band characterized index 1:TΔW¯(t)=2.43. comparison linear–elastic conducted in preceding reveals significant improvement prediction accuracy assigned consideration material behaviour. In order reduce computational effort, novel approximation presented facilitates calculation Neuber’s concept. Validation framework satisfying agreement simulation results, showing average root mean square deviation only approximately eight percent terms total density. effect imperfections components, defect-afflicted large-scale are assessed framework, yielding merge curve. solely two-dimensional simulations, effort substantially decreased. Within present study, reduction 400 times computation time observed. Hence, established presents engineering-feasible method evaluate life imperfective rapid calculations.