Influence of geometric imperfections of flange joints on the fatigue load of preloaded bolts

Okorn, Ivan (avtor), Nagode, Marko (avtor), Klemenc, Jernej (avtor), Oman, Simon (avtor)

In an ideal flange joint configuration, the fatigue endurance of preloaded bolts is contingent upon factors such as the magnitude of preload, applied working load, and the geometric dimensions of the flange. However, real-world flanged joints often deviate from this ideal geometry, introducing imperfections that can markedly escalate the fatigue burden on bolts. This study endeavors to simulate the geometric imperfections inherent in a standard DN40 flange and ascertain their impact on bolt fatigue through a combination of empirical measurements and finite element (FE) analysis. The investigation reveals that even minor deviations in flange geometry, such as non-parallelism on the order of 0.03 mm, can exert a considerable influence on bolt fatigue, particularly when the flange gap aligns with the applied eccentric working load (same side). To mitigate the deleterious effects of these imperfections, the proposal and evaluation of employing filler material between the flanges are made. Specifically, it is demonstrated that a thin layer of liquid metal filler (KemisKit Fe21), substantially alleviates the fatigue burden on bolts. Empirical findings illustrate that this corrective measure enhances the fatigue life of bolts by a factor of more than 30 under the highest applied working load condition.

• Jezik: Angleški jezik
• Ključne besede: bolted flange joint, preload, working load, bolt fatigue life, prying action, geometrical flange imperfections
• 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: 2024
• Št. strani: 16 str.
• Številčenje: Vol. 210, art. 105237
• PID: 20.500.12556/RUL-159265
• UDK: 620.178.3:519.61
• ISSN pri članku: 1879-3541
• DOI: 10.1016/j.ijpvp.2024.105237
• COBISS.SI-ID: 200732163
• Datum objave v RUL: 04.07.2024

Gradivo je del revije

• Naslov: International journal of pressure vessels and piping
• Založnik: Elsevier
• ISSN: 1879-3541
• COBISS.SI-ID: 23268357

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: prirobnična vijačna zveza, delovna obremenitev, prednapetje, življenjska doba vijaka, razpiranje prirobnic, geometrijske napake prirobnic

Projekti

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