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Walker, John
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Publications (5/5 displayed)
- 2023Variable pressure scuffing of a flake graphite cast iron diesel cylinder linercitations
- 2023Dynamic pressure scuffing initiation of a grade 250 flake graphite cast iron
- 2018Human skeletal stem cell response to multiscale topography induced by large area electron beam melting surface treatmentcitations
- 2016Influence of the manufacturing finishing on the nano-scale wear resistance at the taper-trunnion interface in hip implants
- 2016Influence of the manufacturing finishing on the nano-scale wear resistance at the taper-trunnion interface in hip implants
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article
Variable pressure scuffing of a flake graphite cast iron diesel cylinder liner
Abstract
A novel scuffing methodology was developed utilising variable specimen geometry to replicate numerically modelled top compression ring contact pressures (4-62 MPa) from a 12.8-litre heavy duty diesel engine as a function of stroke position. Scuffing of grade 250 cast iron was induced by reciprocating sliding (TE77) against a drip lubricated (PAO4) 52100 rectangular contact operating at 15 Hz and 311 N normal load by incrementing the temperature at 4˚C per minute until a sharp rise in friction coefficient was observed. Scuffing initiation temperature was insensitive to dynamic contact pressure. Formation of an oxide ‘glaze’ layer resulted in friction coefficients as low as 0.03 prior to severe scuffing.