Estimate of Coffin–Manson curve shift for the porous alloy AlSi9Cu3 based on numerical simulations of a porous material carried out by using the Taguchi arrayTomažinčič, Dejan (Avtor) Klemenc, Jernej (Avtor) low-cycle fatiguealuminium alloysporosityCoffin–Manson relationshipTaguchimultivariate regression analysisIn real engineering applications, machine parts are rarely completely homogeneous; in most cases, there are at least some minor notch effects or even more extensive inhomogeneities, which cause critical local stress concentrations from which fatigue fractures develop. In the present research, a shift of the Coffin–Manson ε$_a$–N material curve in a structure with random porosity subjected to dynamic LCF loads was studied. This allows the rest of the fatigue life prediction process to remain the same as if it were a homogeneous material. Apart from the cyclic σ–ε curve, which is relatively easy to obtain experimentally, the ε$_a$–N curve is the second most important curve to describe the correlation between the fatigue life N and the strain level ε$_a$. Therefore, the correct shift of the ε$_a$–N curve of the homogeneous material to a position corresponding to the porous state of the material is crucial. We have found that the curve shift can be efficiently performed on the basis of numerical simulations of a combination of five porosity-specific geometric influences and the associated regression analysis. To model the modified synthetic ε$_a$–N curve, five geometric influences of porosity by X-ray or µ-CT analysis are quantified, and then the porosity-adjusted coefficients of the Coffin–Manson equation are calculated. The proposed approach has been successfully applied to standard specimens with different porosity topography.20222022-03-21 09:36:14Članek v reviji135574UDK: 620.178.3:669.715ISSN pri članku: 1996-1944DOI: 10.3390/ma15062269COBISS_ID: 101646083sl