20.500.12556/DKUM-67099 Fatigue crack initiation and propagation in lotus-type porous material The investigation of fatigue strength of lotus-type structure with nodular cast iron as a base material using computational model is analysed in present study. The irregular pores distribution in transversal and longitudinal direction, regarding the external loading, is considered in the computational models. The complete fatigue process of analyzed porous structure is then divided into the crack initiation (Ni) and crack propagation (Np) period where the total fatigue life (N) is defined as: N = Ni + Np. The crack initiation period is determined using strain life approach where elastic-plastic numerical analysis is performed to obtain the total strain amplitude in the critical stress fields around the pores. The simplified universal slope method is then used to determine the number of stress cycles, Ni, required for formation of initial cracks. The number of stress cycles, Np, required for crack propagation from initial to the critical crack length is also numerically determined using finite element (FE) models, in the frame of Abaqus computation FEM code. The maximum tensile stress (MTS) criterion is considered when analyzing the crack path inside the porous structure. The performed computational analyses show that stress concentrations around individual pores are higher when external loading is acting in transversal direction in respect to the pore distribution. Therefore, further computational analyses regarding crack initiation and crack propagation period have been done only for pores distribution in transversal direction. lotus-type porous structures fatigue crack initiation fatigue crack propagation numerical analysis porozne strukture rast razpoke utrujanje širjenje utrujenostnih razpok numerična analiza true false true Angleški jezik Slovenski jezik Znanstveno delo 2017-08-02 12:25:16 2017-08-02 12:25:58 2022-08-01 13:32:44 2019-07-11 16:08:59 2016 0 0 str. 152-160 št. 35 Letn. 10 January 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1971-8993 621.7+621.9:519.6 515811097 19254038 10.3221/IGF-ESIS.35.18 1971-8993 URN:SI:UM:DK:HGWYOCDF Frattura_ed_Integrità_Strutturale_2016_Glodez_Fatigue_Crack_Initiation_and_Propagation_in_Al-Alloys.pdf Frattura_ed_Integrità_Strutturale_2016_Glodez_Fatigue_Crack_Initiation_and_Propagation_in_Al-Alloys.pdf 1 191961968DE01C5C1DDD81F719955943 aeb31a5f507643fb45f80dd8606bd66b0c2136aa9090da09e665fc143596c39d 76c65483-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/cd0aed98-abd6-4496-813b-f0a92a91bb66 https://dk.um.si/Dokument.php?lang=slv&id=114714 http://www.fracturae.com/index.php/fis/article/view/IGF-ESIS.35.18 1 https://dk.um.si/Dokument.php?lang=slv&id=114713 Fakulteta za strojništvo 0 0 0