REVIEW OF HIGH CYCLE FATIGUE MODELS APPLIED FOR MULTIAXIAL TENSION-TORSION LOADING BASED ON A NEW ACCURACY ASSESSMENT PARAMETER
KUN LORAND 1. “Politehnica” University of Timisoara, Mechanical Engineering Faculty, Department of Mechanics and Strength of Materials, Bv. Mihai Viteazul 1, Timisoara, 300222, Romania
2. National R&D Institute for Welding and Material Testing – ISIM Timisoara, Bv. Mihai Viteazul 30, Timisoara, 300222, Romania
A parameter denoted “Critical Position Offset Angle” – CPOA is proposed in this paper, developed as a new approach for assessing the accuracy of multiaxial HCF models based on the angle difference between the predicted critical plane and the plane where the equivalent stress reaches its peak value. A number of 11 models are compared using this parameter, by applying them to simulated multiaxial tension-torsion loadings with different grades of nonproportionality. A wider scatter in CPOA values is identified in cases of loading with dominant shear stress. Overall, the equivalent stress models give the best results.
