Jezik: | Slovenski jezik |
---|---|
Leto izida: | 2016 |
Tipologija: | 2.09 - Magistrsko delo |
Organizacija: | UM FS - Fakulteta za strojništvo |
Založnik: | [S. Dervarič] |
UDK: | 004.942:621.178.3(043.2) |
COBISS: | 20434454 |
Št. ogledov: | 781 |
Št. prenosov: | 110 |
Ocena: | 0 (0 glasov) |
Metapodatki: |
Sekundarni jezik: | Angleški jezik |
---|---|
Sekundarni naslov: | Fatigue analysis of porous structures using XFEM method |
Sekundarni povzetek: | In this thesis a study of the investigation of fatigue strength of lotus-type structure with nodular cast iron as a base material using numerical simulations has been performed. The complete fatigue process of analysed porous structure was divided into the crack initiation and crack propagation period. The crack initiation period was determined using strain life approach and the number of stress cycles required for crack propagation from initial to the critical crack length was determined with integration of Paris equation. For the calculation of these periods we used the material properties of porous material and quantities that were determined using numerical simulations in Abaqus. Performed numerical simulations contained the same geometric 2D model of lotus-type structure which was loaded in two different load cases. In the model which was loaded only in 1-axle we made numerical simulations using the finite element method (by this method we manually put and propagated the cracks using the MTS criterion) and the Extended Finite Element Method (XFEM). With the XFEM method we specified crack initiation and crack propagation criterion after which then the Abaqus determined the location of initial crack and propagated the crack to a critical length. In the model which was loaded in 2-axle only XFEM method was used in numerical simulations. We expected the same computational results of total fatigue life in the model which was loaded in 1-axle with both methods; however this did not happen since the biggest differences were in crack initiation period with XFEM method where we considered only elastic material properties in numerical simulations. Compared analyses of models in the two different load cases were as we expected. In the 2-axial loaded model crack initiated and propagated faster to a critical length compared to the 1-axial model. |
Sekundarne ključne besede: | porous materials;lotus-type structure;fatigue analysis;crack initiation and crack propagation;XFEM method; |
URN: | URN:SI:UM: |
Vrsta dela (COBISS): | Magistrsko delo/naloga |
Komentar na gradivo: | Univ. v Mariboru, Fak. za strojništvo |
Strani: | VI, 55 str. |
ID: | 9176149 |