Fatigue of aluminium linings in plain automotive bearings
Fatigue of aluminium linings in plain automotive bearings
Modern plain bearing designs as used in small automotive engines typically comprise a number of layers of different material. The development of these material systems has been carried out in a semi-empirical manner over many years to maintain pace with new engine designs. The service loading for plain bearings is becoming increasingly severe and it is important that new bearing material systems are designed to provide the longest possible operating life at these higher loads. To date very little work has been carried out to characterise the fundamental fatigue behaviour of such material systems. This thesis presents the results of a three year research program concentrating on one modern bearing design. This is a typical shell bearing, constructed in two parts of half shells, which are clamped together within a housing to support the journal. Each half shell comprises a thin layer of a complex Al, Sn, Si, Cu lining material, bonded to a steel backing layer via a thin layer of aluminium foil.
A series of standard experimental material characterisation techniques are applied to investigate the material system's macroscopic geometry and properties, as well as more advanced statistical tessellation-based approaches, used to characterise the lining material microstructure. In addition, the results of a detailed experimental program of fatigue testing are presented, characterising the initiation and short fatigue crack growth behaviour in this material system. These are used to establish the key parameters controlling early crack propagation, hence providing material optimisation data. Further insight into the preferential location of a fatigue crack initiation events is obtained through the application of tessellation approaches, which provide statistical identification of microstructural features associated with fatigue crack initiation.
University of Southampton
Joyce, Mark Richard
2df092cc-c025-4e91-a552-1fa79003c6eb
2000
Joyce, Mark Richard
2df092cc-c025-4e91-a552-1fa79003c6eb
Joyce, Mark Richard
(2000)
Fatigue of aluminium linings in plain automotive bearings.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Modern plain bearing designs as used in small automotive engines typically comprise a number of layers of different material. The development of these material systems has been carried out in a semi-empirical manner over many years to maintain pace with new engine designs. The service loading for plain bearings is becoming increasingly severe and it is important that new bearing material systems are designed to provide the longest possible operating life at these higher loads. To date very little work has been carried out to characterise the fundamental fatigue behaviour of such material systems. This thesis presents the results of a three year research program concentrating on one modern bearing design. This is a typical shell bearing, constructed in two parts of half shells, which are clamped together within a housing to support the journal. Each half shell comprises a thin layer of a complex Al, Sn, Si, Cu lining material, bonded to a steel backing layer via a thin layer of aluminium foil.
A series of standard experimental material characterisation techniques are applied to investigate the material system's macroscopic geometry and properties, as well as more advanced statistical tessellation-based approaches, used to characterise the lining material microstructure. In addition, the results of a detailed experimental program of fatigue testing are presented, characterising the initiation and short fatigue crack growth behaviour in this material system. These are used to establish the key parameters controlling early crack propagation, hence providing material optimisation data. Further insight into the preferential location of a fatigue crack initiation events is obtained through the application of tessellation approaches, which provide statistical identification of microstructural features associated with fatigue crack initiation.
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Published date: 2000
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Local EPrints ID: 464365
URI: http://eprints.soton.ac.uk/id/eprint/464365
PURE UUID: 9437c9af-1cc4-4293-a630-ace6809ec32d
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Date deposited: 04 Jul 2022 22:20
Last modified: 16 Mar 2024 19:27
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Author:
Mark Richard Joyce
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