Napredna pretraga

Pregled bibliografske jedinice broj: 251797

Effects of materials heterogeneity on the stress and strain distribution in the vicinity of the crack front


Kozak, Dražan; Gubeljak, Nenad and Vojvodič-Tuma, Jelena
Effects of materials heterogeneity on the stress and strain distribution in the vicinity of the crack front // Proceedings of the 6th International Conference 'New Trends in Fatigue and Fracture' - NT2F6 on CD Rom / Šuštaršič, Borivoj ; Jenko, Monika (ur.).
Ljubljana: Institute of Metals and Technology Ljubljana, 2006. (pozvano predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
Effects of materials heterogeneity on the stress and strain distribution in the vicinity of the crack front

Autori
Kozak, Dražan ; Gubeljak, Nenad and Vojvodič-Tuma, Jelena

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 6th International Conference 'New Trends in Fatigue and Fracture' - NT2F6 on CD Rom / Šuštaršič, Borivoj ; Jenko, Monika - Ljubljana : Institute of Metals and Technology Ljubljana, 2006

Skup
6th International Conference 'New Trends in Fatigue and Fracture' - NT2F6

Mjesto i datum
Brdo kod Kranja, Slovenija, 14-17.05.2006

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Overmatch welded joint; crack; stress and strain distribution; finite element analysis

Sažetak
In this investigation a high strength low allowed steel (HSLA) with 700 MPa strength class was used as a base material. A butt welded joint with X grooves was produced with an overmatched metal with yield strength value greater for 22% than base material. Three-point bending Bx2B test specimens (thickness B=36 mm) were extracted from the welded joints. The straight crack front (a0=35, 571 mm) crosses over different materials through the thickness of the specimen. Both, fracture tests and 3-D finite element modelling are performed. Regarding the symmetry of the specimen, only one half is modelled. The CTOD parameter of fracture toughness was calculated for each load up to the load at which stable crack growth occurs. The comparison between experimental and numerical values of CTOD (d5) displacements is in good accordance. Principal stress Sy and Mises equivalent stress Seq as well as plastic equivalent strain Epl, eq in the moment of crack initiation have been presented for 10 layers through the thickness. Crack opening stress (Sx in this case) over the local fracture toughness value could be considered as the parameter which determinates the direction of crack front propagation. The results show that the presence of a low strength base metal contributes to the crack path deviation in the mid-thickness of the specimen. Both the crack path deviation and a higher toughness of base metal increase the critical fracture toughness value of the welded joint.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo



POVEZANOST RADA


Projekt / tema
0152018

Ustanove
Strojarski fakultet, Slavonski Brod