Naslov
Numerical Modelling of the Crack Propagation Path at Gear Tooth Root

Autori
Jelaska, Damir ; Glodež, Srečko ; Kramberger, Janez ; Podrug, Srđan

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

Izvornik
ASME Proceedings | Power Transmission and Gearing / - Chicago (IL) : American Society of Mechanical Engineers (ASME), 2003

ISBN
0-7918-3702-5

Skup
ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference

Mjesto i datum
Chicago (IL), Sjedinjene Američke Države, 02.09.2003. - 06.09.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
machine elements ; fatigue initiation ; fatigue crack growth ; numerical modelling

Sažetak
A computational model for determination of service life of gears in regard to bending fatigue in a gear tooth root is presented. The Coffin-Manson relationship is used to determine the number of stress cycles required for the fatigue crack initiation, where it is assumed that the initial crack is located at the point of the largest stresses in a gear tooth root. The simple Paris equation is then used for the further simulation of the fatigue crack growth, where required material parameters have been determined previously by the appropriate test specimens. The functional relationship between the stress intensity factor and crack length, which is needed for determination of the required number of loading cycles for a crack propagation from the initial to the critical length, is obtained numerically in the framework of the Finite Element Method. The total number of stress cycles for the final failure to occure is then sum of the number of stress cycles required for the fatigue crack initiation and the number of stress cycless for a crack propagation. Although some influences (non-homogeneous material, travelling of dislocations, etc.) were not taken into account in the computational simulations, the presented model seems to be very suitable for determination of service life of gears because numerical procedures used here are much faster and cheaper if compared with the experimental testing.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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