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Damage detection of a composite bearing liner using Acoustic Emission.

Karras, Konstantinos, Pullin, Rhys, Grosvenor, Roger and Clarke, Alastair 2017. Damage detection of a composite bearing liner using Acoustic Emission. Presented at: BSSM 12th International Conference on Advances in Experimental Mechanics, Sheffield, UK, 21 - 31 August 2017.

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Abstract

Self-lubricating bearings are widely used within the aerospace industry and are commonly found, for example, in the pitch control assembly of a rotorcraft. Due to their high importance the components located within such systems are marked as critical parts and therefore the monitoring of their current health state is of great value. The bearing liner which provides the sliding surface between inner and outer races is a Polytetrafluoroethylene (PTFE) and glass fibre woven composite. Low friction coefficients are achieved via the deposition of PTFE third-body particles, which occupy the valley-features at the roughness scale on the non-conformal sliding surfaces. As these third-bodies form, the woven matrix composite surface layers containing PTFE are consumed up to a point where only the structural reinforcing glass fibres are present, resulting in a higher coefficient of friction and accelerating the wear process. A cylinder-on-flat oscillating wear test bench developed within Cardiff University allowed for the gathering of physical data including temperature and Acoustic Emission (AE) signals during an accelerated wear test of the liner material. A radial load of 2.5 kN and oscillation frequency of 5Hz were applied to replicate typical operating conditions within a pitch control system. Frequency analysis techniques were carried out on the AE data, successfully identifying the transition from healthy contact into the failure region.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Date of First Compliant Deposit: 13 September 2017
Last Modified: 27 Jul 2019 22:00
URI: http://orca.cf.ac.uk/id/eprint/104596

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