Numerička optimizacija širenja prsline u linearnom elastičnom materijalu pomoću metoda PFEMCT-SIF

  • Mohammed Bentahar Univerzitet u Saidi „Dr Mulai Tahar”, Tehnološki fakultet, Departman za građevinarstvo i hidrauliku, Saida, Narodna Demokratska Republika Alžir https://orcid.org/0000-0002-2166-678X
  • Noureddine Mahmoudi Univerzitet u Saidi „Dr Mulai Tahar”, Tehnološki fakultet, Departman za građevinarstvo i hidrauliku, Saida, Narodna Demokratska Republika Alžir https://orcid.org/0000-0002-9740-0857
  • Youcef Moulai Arbi Univerzitet „Mustafa Stamboli”, Laboratorija za kvantnu fiziku materije i matematičko modeliranje (LPQ3M), Maskara, Narodna Demokratska Republika Alžir https://orcid.org/0000-0002-6534-8820
DOI: https://doi.org/10.5937/vojtehg73-52739
Ključne reči: vrh prsline, širenje prsline, metoda SFEMCT-SIF, kriterijum MCSC i kriterijum po Richard-u, konture

Sažetak


Uvod/cilj: U ovoj studiji ispituje se uticaj broja kontura koje okružuju vrh prsline na faktore intenziteta napona (stress intensity factor - SIF) korišćenjem pristupa PFEMCT-SIF (Propagation Finite Element Method Crack Tip Stress Intensity Factor). Takođe, porede se kriterijum maksimalnog obodnog naprezanja (maximum circumferential stress criterion – MCSC) i kriterijum po Richard-u za predviđanje širenja prsline.

Metode: Kod konačnih elemenata, napisan u Visual Fortran-u, razvijen je za modelovanje vrhova prslina sa 3, 5, 10, 15 i 20 kontura pomoću  kvadratnih elemenata čistog opterećenja sa 4 čvora (CPE4). Softver Abaqus korišćen je za izračunavanje faktora intenziteta napona i uglova orijentacije prslina. Analizirane su horizontalne i nagnute prsline na čeličnoj ploči pri naponu na zatezanje. Rezultati su potvrđeni poređenjem sa analitičkim rešenjima i prethodnim numeričkim studijama.

Rezultati: Model sa 10 kontura pokazao je najbolje slaganje sa analitičkim vrednostima faktora intenziteta napona. Povećanje broja kontura poboljšalo je preciznost faktora intenziteta napona kod horizontalnih prslina, dok je prevelika gustina mreže dovela do divergencije kod nagnutih prslina. Oba kriterijuma (MCSC i  Richard) dala su uporedive putanje prsline, pri čemu je kriterijum maksimalnog obodnog naprezanja pokazao nešto veću preciznost.

Zaključak: Metoda PFEMCT-SIF efikasno procenjuje faktore intenziteta napona i predviđa puteve širenja prslina. Model vrha prsline sa 10 kontura predstavlja balans između preciznosti i računarske efikasnosti. Istaknuta je važnost optimizacije gustine mreže vrha prsline u simulacijama mehanike loma.

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Objavljeno
2025/02/02
Broj časopisa
Vol. 73 Br. 1 (2025): januar - mart
Rubrika
Originalni naučni radovi

Sva prava zadržana (c) 2025 Mohammed Bentahar, Noureddine Mahmoudi, Youcef Moulai Arbi

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