Calculation of plastic notch stress intensity factor and strain energy density by Peak Stress Method under low-cycle fatigue conditions

Šeruga, Domen (avtor), Campagnolo, Alberto (avtor), Klemenc, Jernej (avtor), Meneghetti, Giovanni (avtor)

In this article, an idea for prediction of low-cycle fatigue durability of notched components is presented. The concept implements the Peak Stress Method into the calculation of both the plastic notch stress intensity factor and averaged elasto-plastic strain energy density. The scatter reduction which is characteristic for the approach using the strain energy density calculation under high-cycle fatigue conditions is less pronounced in the low-cycle fatigue area. Importantly, the otherwise changed slope of the durability curve in the low-cycle fatigue regime of the material remains almost equal to the slope in the high-cycle fatigue regime of the material using the implemented method. The method has been validated on tension–compression testing of plain and V-notched specimens of structural steel St-52 with three notch angles: 35°, 90° and 135°. It is shown that significant agreement can be drawn between predictions using the Peak Stress Method and finite element evaluation of the averaged strain energy density.

• Jezik: Angleški jezik
• Ključne besede: low-cycle fatigue, peak stress method, plasticity, strain energy density, structural steel St-52
• 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: 2026
• Št. strani: 13 str.
• Številčenje: Vol. 142, art. 105396
• PID: 20.500.12556/RUL-177578
• UDK: 620.178.3:669.1
• ISSN pri članku: 0167-8442
• DOI: 10.1016/j.tafmec.2025.105396
• COBISS.SI-ID: 262910979
• Datum objave v RUL: 24.12.2025

Gradivo je del revije

• Naslov: Theoretical and applied fracture mechanics
• Skrajšan naslov: Theor. appl. fract. mech.
• Založnik: North-Holland
• ISSN: 0167-8442
• COBISS.SI-ID: 825366

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: malociklično utrujanje, metoda konic napetosti, plastičnost, deformacijska energija, konstrukcijsko jeklo

Projekti

• Financer: EC - European Commission
• Naslov: Erasmus+ Staff mobility

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0182
• Naslov: Razvojna vrednotenja