Microstructural modelling of fatigue initiation in aluminium-bearing alloys
Microstructural modelling of fatigue initiation in aluminium-bearing alloys
Microstructural fatigue initiation in Al-Sn-Si-Cu-Ni bearing lining alloys is reported and investigated. The secondary phases of such alloys comprise fine and relatively few Sn and Si particles as well as a large number of hard AlNi3-type intermetallics, frequently encapsulated within soft Sn layers. During fatigue tests, these particles were observed to initiate short fatigue cracks. Through elasto-plastic finite element analysis of ideal microstructures but with realistic geometric and mechanical property data, critical values of key stress and strain components within the matrix, the Sn layers, and the particles were predicted and linked to microstructural features associated with observed fatigue initiation. These modelling results indicate the extent to which either the hydrostatic stresses or plastic shear strains may be responsible for fatigue crack initiation in the Sn layers, as well as the optimum microstructural characteristics that would minimise tensile stresses, which are responsible for brittle particle fracture.
aluminium alloys, bearing linings, fatigue initiation, micromechanics, plasticity, secondary phases
249-264
Syngellakis, Stavros
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Ali, M.S.
84b3971f-657d-43cd-bf09-68f2d28a7fab
Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2013
Syngellakis, Stavros
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Ali, M.S.
84b3971f-657d-43cd-bf09-68f2d28a7fab
Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Syngellakis, Stavros, Ali, M.S. and Reed, Philippa A.S.
(2013)
Microstructural modelling of fatigue initiation in aluminium-bearing alloys.
International Journal of Computational Methods & Experimental Measurements, 1 (3), .
(doi:10.2495/CMEM-V1-N3-249-264).
Abstract
Microstructural fatigue initiation in Al-Sn-Si-Cu-Ni bearing lining alloys is reported and investigated. The secondary phases of such alloys comprise fine and relatively few Sn and Si particles as well as a large number of hard AlNi3-type intermetallics, frequently encapsulated within soft Sn layers. During fatigue tests, these particles were observed to initiate short fatigue cracks. Through elasto-plastic finite element analysis of ideal microstructures but with realistic geometric and mechanical property data, critical values of key stress and strain components within the matrix, the Sn layers, and the particles were predicted and linked to microstructural features associated with observed fatigue initiation. These modelling results indicate the extent to which either the hydrostatic stresses or plastic shear strains may be responsible for fatigue crack initiation in the Sn layers, as well as the optimum microstructural characteristics that would minimise tensile stresses, which are responsible for brittle particle fracture.
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Published date: 2013
Keywords:
aluminium alloys, bearing linings, fatigue initiation, micromechanics, plasticity, secondary phases
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 353170
URI: http://eprints.soton.ac.uk/id/eprint/353170
PURE UUID: 6c558a1b-67c0-477e-80c5-ad8d988bae8b
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Date deposited: 03 Jun 2013 11:56
Last modified: 15 Mar 2024 02:45
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Author:
Stavros Syngellakis
Author:
M.S. Ali
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