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

Tomažinčič, Dejan (avtor), Klemenc, Jernej (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: low-cycle fatigue, aluminium alloys, porosity, Coffin–Manson relationship, Taguchi, multivariate regression analysis
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 24 str.
• Številčenje: Vol. 15, iss. 6, art. 2269
• PID: 20.500.12556/RUL-135574
• UDK: 620.178.3:669.715
• ISSN pri članku: 1996-1944
• DOI: 10.3390/ma15062269
• COBISS.SI-ID: 101646083
• Datum objave v RUL: 21.03.2022

Gradivo je del revije

• Naslov: Materials
• Skrajšan naslov: Materials
• Založnik: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 18.03.2022

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: malociklično utrujanje, aluminijeve zlitine, poroznost, soodvisnost Coffin-Manson, Taguchi, multivariatna regresijska analiza

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0182
• Naslov: Razvojna vrednotenja