Naslov
Structural integrity assessment of an axle pin of wind-turbine

Autori
Gubeljak ; Nenad ; Cvetić ; Miljenko ; Božić, Željko ; Predan, Jožef

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

Izvornik
Proceedings of the 16th International Conference on New Trends in Fatigue and Fracture / Božić, Željko ; Vrdoljak, Milan - Zagreb : Fakultet strojarstva i brodogradnje Sveučilišta u Zagrebu, 2016, 1-7

ISBN
978-953-7738-40-2

Skup
16th International Conference on New Trends in Fatigue and Fracture

Mjesto i datum
Dubrovnik, Hrvatska, 24.05.2016. - 27.05.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Structure integrity assessment ; axle pin in wind turbine ; crack’s defects

Sažetak
The reliable production of electricity depends on the wind turbine’s components and their sensitivity to flaws. During the ultrasonic inspection the radial outside surface cracks were detected at axle pin. Mechanically, the axle pin is the most critical part of the structure and is loaded by bending. The axle pin transfer bending load from the wind-rotor blades and wind mill column. The axle is usually made of cast steel. Changes in wall thicknesses and reduction of diameters can cause defects in materials, such as pores, flaws, or any remaining slag. Therefore, for reliable use, it is necessary to perform structural integrity assessment of axle for flaws such as cracks. Structure integrity assessment procedure is tool for estimation effect of crack size on maximum static loading capacity. A structural Integrity assessment was performed according to the SINTAP structure integrity procedure, on an axle pin with multiple cracks within a critical section. Numerical modeling was performed using finite element methods in order to determine the stress-strain condition of the axle pin. The results show that the range of the stress integrity factor for dynamic loading can exceed the fatigue stress intensity factor at threshold regions. Therefore, fatigue crack propagation is possible by finding the flaws. The results also show that the final collapse of an axle pin appears at a significant fatigue crack size. On the basis of these results, the on-line monitoring system is recommended for the critical area of an axle.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA