Computational analysis of gear-box roller-bearing white-etch cracking. Issue 4 (11th November 2014)

• Record Type: Journal Article
• Authors: Grujicic, M.; Chenna, V.; Galgalikar, R.; Snipes, J.S.; Ramaswami, S.; Yavari, R.
• Is Part Of: International journal of structural integrity. Volume 5:Issue 4(2014)
• Page Start: 290
• Page End: 327
• Publication Date: 2014-11-11
• Subjects: Structural engineering -- Research -- Periodicals; 620.11205
• DOI: 10.1108/IJSI-10-2013-0028
• Languages: English
• ISSNs: 1757-9864

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <sec> <title content-type="abstract-heading">Purpose</title> <p> – A simple economic analysis has revealed that in order for wind energy to be a viable alternative, wind-turbines (convertors of wind energy into electrical energy) must be able to operate for at least 20 years, with only regular maintenance. However, wind-turbines built nowadays do not generally possess this level of reliability and durability. Specifically, due to the malfunction and failure of drive-trains/gear-boxes, many wind-turbines require major repairs after only three to five years in service. The paper aims to discuss these issues. </p> </sec> <sec> <title content-type="abstract-heading">Design/methodology/approach</title> <p> – The subject of the present work is the so-called white etch cracking, one of the key processes responsible for the premature failure of gear-box roller-bearings. To address this problem, a multi-physics computational methodology is developed and used to analyze the problem of wind-turbine gear-box roller-bearing premature-failure. The main components of the proposed methodology include the analyses of: first, hydrogen dissolution and the accompanying grain-boundary embrittlement phenomena; second, hydrogen diffusion from the crack-wake into the adjacent unfractured material; third, the inter-granular fracture processes; and fourth, the kinematic and structural response of the bearing under service-loading conditions. </p> </sec> <sec> <title content-type="abstract-heading">Findings</title> <p> – The results obtained clearly revealed the operation of the white-etch cracking phenomenon in wind-turbine gear-box roller-bearings and its dependence on the attendant loading and environmental conditions. </p> </sec> <sec> <title content-type="abstract-heading">Originality/value</title> <p> – The present work attempts to make a contribution to the resolution of an important problem related to premature-failure and inferior reliability of wind-turbine gearboxes.</p> </sec> </abstract>