20.500.12556/RUL-135574 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 array In 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. low-cycle fatigue aluminium alloys porosity Coffin–Manson relationship Taguchi multivariate regression analysis malociklično utrujanje aluminijeve zlitine poroznost soodvisnost Coffin-Manson Taguchi multivariatna regresijska analiza true false true Angleški jezik Slovenski jezik Članek v reviji 2022-03-21 09:36:14 2022-03-21 09:36:24 2022-09-14 04:14:02 0000-00-00 00:00:00 2022 0 0 24 str. iss. 6, art. 2269 Vol. 15 Mar. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.178.3:669.715 1996-1944 10.3390/ma15062269 101646083 materials-15-02269-v3.pdf materials-15-02269-v3.pdf 1 BF27F26A682060BD0ED28A15260CB6C2 813ee5f5a5c7a258aebf6e742a9d1198f4b1e085426f32e29b8965d1f14a6607 4a40407e-f2cf-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157635 https://www.mdpi.com/1996-1944/15/6/2269 1 fe7403b7-a8f1-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154721 Fakulteta za strojništvo 0 0 0