Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636083
Title: Rig design to provide flange methodology validation data
Author: Berrington, R. E.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2000
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Abstract:
Over the years many researchers have investigated various aspects of bolted flanged joints. Much of this has been in the areas of flange sealing and fatigue characterisation of the joint components. Roll-Royce plc is researching new methods of analysing the flanged joints on its aero-engine casings, with the aim of reducing weight by up to thirty percent without compromising reliability or efficiency. In modern civil aero-engines, the need to withstand the excessive stresses induced by the loss of a fan blade is the design case for many of the structural casing flanges. These flanged joints tend to be thinner, and much more flexible, than their industrial counterparts due to the use of high strength alloys. Under high load conditions these joints experience a significant amount of plasticity, both in the bolts and in the flange areas between the bolt holes. This makes the basic strength of the joint difficult to predict accurately. To validate the prediction methods experimental data at high loads is required. This thesis presents the design and commissioning of a rig capable of testing to failure, in a controlled manner, an assembly of actual engine casings from the main structural load path of two large modern civil aero-engines. The casings are fully strain-gauged to provide as much validation data as possible. The rig will provide data under combinations of axial load, bending moment and pressure, extending from normal operating loads, through the ultimate design loads, and up to eventual failure. To ensure failure the rig can apply axial loads up to 400 tons and bending moments up to 12 million pound-inches.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.636083  DOI: Not available
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