Naslov
Numerical modelling of crack growth in a gear tooth root

Autori
Podrug, Srdjan ; Glodež, Srečko ; Jelaska, Damir

Izvornik
Strojniški vestnik - Journal of Mechanical Engineering (0039-2480) 57 (2011), 7-8; 579-586

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
gears; fatigue; crack growth; numerical modelling

Sažetak
A computational model for determination of crack growth in a gear tooth root is presented. Two loading conditions are taken into account: (i) normal pulsating force acting at the highest point of the single tooth contact and (ii) the moving load along the tooth flank. In numerical analysis it is assumed that the crack is initiated 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. The functional relationship between the stress intensity factor and crack length K=f(a), which is needed for determination of the required number of loading cycles Np for a crack propagation from the initial to the critical length, is obtained using displacement correlation method in the framework of the FEM-method considering the effect of crack closure. The model is used for determination of fatigue crack growth in a real gear made from through-hardened steel 42CrMo4, where required material parameters have been determined previously by the appropriate test specimens. The results of the numerical analysis show that the prediction of crack propagation live and crack path in a gear tooth root are significantly different for both considering loading conditions.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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