Evaluation Methodology of Axial-Torsional Low-Cycle Fatigue Tests and its Verification by FEM

Abstract

The master thesis deals with the proposal of a methodology for the evaluation of axial-torsional low-cycle fatigue tests. First, the current state of the art including recommended standards for multiaxial fatigue testing is described. The classic evaluation procedure considers the constant value of shear stress along the thickness of the specimen. The methodology has been validated using the finite element method in Ansys software considering the material properties of an aluminium alloy manufactured by selective laser melting technology. Then, all the equations used in the methodology were implemented into Python code and applied to other fatigue test data. The proposed methodology provides a more accurate evaluation of the axial-torsional fatigue data, which is very important for subsequent computational fatigue analysis.