Napovedovanje rasti utrujenostne razpoke z metodo končnih elementov

Istenič, Andraž (author), Klemenc, Jernej (mentor)

V magistrskem delu smo predstavili uporabo komercialnega programa Abaqus 6.12 za napoved rasti razpok pri dinamično obremenjenih 3D-problemih. Pri simulacijah smo uporabili razširjene končne elemente (XFEM) v kombinaciji s Parisovim zakonom. Simulacije smo izvedli na C-preskušancu in preluknjanem preskušancu. V obeh primerih smo dosegli rast razpoke tako pri statičnem kot dinamičnem obremenjevanju. Pri preluknjanem preskušancu smo dobljene rezultate primerjali z eksperimentalnimi krivuljami zdržljivosti. Ugotovili smo, da je metoda sicer obetavna, vendar je že pri zmerno zapletenih primerih težko doseči konvergenco pri simulacijah rasti utrujenostnih razpok.

• Language: Slovenian
• Keywords: rast razpok, utrujanje, razširjeni končni elementi, Parisov zakon
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [A. Istenič]
• Year: 2021
• Number of pages: XXVI, 64 str.
• PID: 20.500.12556/RUL-127961
• UDC: 620.178.3:519.61:004.94(043.2)
• COBISS.SI-ID: 71319811
• Publication date in RUL: 30.06.2021

Secondary language

• Language: English
• Title: Predicting a fatigue-crack growth using finite-element method

Abstract

In the master's thesis a use of commercially available software Abaqus 6.12 for predicting a fatigue-crack growth in 3D solid problems is presented. For simulations an extended finite element method (XFEM) was used in combination with Paris law. An analysis of a compact tension (CT) and a notched dog-bone shaped specimen was performed. In both cases a static and dynamic crack growth was studied. Results of a notched dog-bone shaped specimen were compared to the experimental S-N curves. It was found out that method is promising but it is difficult to achieve convergence even for those moderately complex 3D specimens.

• Keywords: crack growth, fatigue life, extended finite-element method, Paris law