ETD

• 42CrMo4
• additive manufacturing
• cyclic-plasticity
• fatigue
• Inconel 718
• lattice structures
• pores
• residual stresses
• statistics
• surface roughness
• theory of critical distances

Classical ductile and traditional materials may undergo cyclic plasticity under fatigue loadings in the presence of notches, thus a reliable description of the hardening behaviour of the material is necessary to model the cyclic plastic behaviour. The aim of the PhD project regarding the “traditional” materials is the combination of a proper hardening rule and advanced fatigue models, such as critical plane criteria and the theory of critical distances, to accurately describe the experimental fatigue results. On the other hand, the new additive manufacturing technologies allow the production of complex geometries by reducing the waste of material, but the obtained specimens generally present internal defects and considerable surface roughness. The aim of the PhD project regarding additive manufacturing materials is the development of a model that includes the effect of internal defects, the effect of surface roughness and the effect of geometrical notches, thus leading to a correct interpretation of the experimental fatigue results.