Defect-induced specificities in the fatigue properties of additively manufactured metals
Vladimír Chmelko, Slovak University of Technology in Bratislava, Slovakia
The lecture analyses the specific properties that additive manufacturing technology has brought to the cyclic behaviour of metallic materials. For a selection of well-known materials, the static strength characteristics obtained through conventional manufacturing and additive manufacturing are compared. The same comparison is performed for cyclic behaviour under uniaxial loading. Based on direct cyclic tests carried out on selected materials under alternating axial loading and alternating torsion, alongside their conventionally manufactured equivalents, the specific characteristics of AM materials are documented. Computational modelling will help to reveal the role of defects in AM materials in their behaviour under cyclic loading.
A comparison and analysis of the experimental results leads to a summary and partial quantification of the specific characteristics of additively manufactured metals, which must be taken into account in the computational assessment of fatigue life under multi-axial loading. The experimental results on fatigue life under multi-axial loading are compared with selected criteria for multi-axial fatigue.