A novel analytical procedure for fatigue strength assessment and lifetime estimation of AM metallic components

In the present paper, a novel analytical procedure for both fatigue strength assessment and lifetime estimation of Additively Manufactured (AM) metallic components is proposed. More precisely, the procedure is able to take into account the intrinsic defects (generally characterising AM metals), which are responsible for a detrimental effect on fatigue limits. Such a procedure is based on the joint application of: (i) the Kitagawa-Takahashi diagram, for the fatigue limits calculation and (ii) the criterion of Carpinteri et al., for the fatigue strength assessment and lifetime estimation. In particular, such a diagram is formulated by alternatively exploiting the area parameter model and the modified El-Haddad model. The novel procedure is applied to some experimental data available in the literature related to AM AlSi10Mg specimens, subjected to cyclic axial and torsional loading. The theoretical results are compared with the experimental data, highlighting which of the above two formulations provides more accurate results.