Cohesive model application to micro-crack nucleation and growth

Galkiewcz, Jaroslaw

doi:10.1016/j.prostr.2016.06.205

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…13 For instance, based on Eshelby's equivalent inclusion theory, Koffi et al 15 solved the contact problems in the presence of elliptical elastic inclusions, and the results showed that the position of the inclusion had a strong influence on the local stress distribution of region surrounding inclusion. Xu et al [16][17][18][19] obtained the stress field around the oxide inclusion bonded with base metal and numerically investigated the effects of inclusion mechanical property, size and depth on the stress redistribution in material. Jha et al 20,21] and Yu et al 21 considered the local high-stress phenomenon induced by the Al 2 O 3 inclusions with a higher Young's modulus in material, and the results showed that the fatigue crack initiation was mainly originated from the region near inclusion.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life analysis of wind turbine gear with oxide inclusion

Liu

Sun

Hou

et al. 2020

Fatigue Fract Eng Mat Struct

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Considering a great deal of wind turbine gear failure cases, it is shown that the oxide inclusion has been one of the main reasons for the failure of the gear shaft under fatigue loading condition. In this paper, the fatigue behaviour of gears involving oxide inclusion under real operating condition is investigated. A three-dimensional finite element model for helical gear pair applied in the middle stage of wind power increasing gearbox is established, and the fatigue life of nonmetallic inclusion zone of middle gear shaft is predicted using Miner's theory and real load spectrum of wind power growth gearbox. Then, the effects of several factors (such as the size and position of oxide inclusion and residual stress induced by manufacturing) on the fatigue life of gears with inclusion are studied. The results show that both inclusion size and position have great influence on the fatigue life of gears, and the compress residual stress will prolong the fatigue life of gears. Furthermore, the critical safety line and safety region of gears with oxide inclusion have been obtained for three representative inclusion positions. The present work is expected to provide a guidance for the engineering design and life safety evaluation of wind turbine gears.

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