Search results for: R.A. Barrett

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article

The effect of inclusions on the high‐temperature low‐cycle fatigue performance of cast MarBN: Experimental characterisation and computational modelling

E.M. O'Hara, N.M. Harrison, B.K. Polomski, R.A. Barrett, more

Fatigue & Fracture of Engineering Materials & Structures > 41 > 11 > 2288 - 2304

The presence of inclusions is a known source of crack initiation and component failure in cast materials. In this work, the role of inclusions is investigated via a combined program of high‐temperature low‐cycle fatigue testing and computational modelling of a tempered martensitic steel, MarBN. Microstructural analysis has shown that manufacturing‐induced oxide inclusions are a key source of fatigue...

article

A physically-based creep damage model for effects of different precipitate types

C.Ó Murchú, S.B. Leen, P.E. O’Donoghue, R.A. Barrett

Materials Science and Engineering: A > 2017 > 682 > C > 714-722

The development of a new precipitate coarsening continuum damage mechanics (CDM) model to simulate the multi-precipitate strengthening mechanisms present in 9Cr steels under high temperature creep deformation is presented here. The key strengthening and degradation associated with the different coarsening kinematics and volume fractions associated with M₂₃C₆ and MX precipitates in 9Cr steels are simulated...

article

A dislocation-based model for high temperature cyclic viscoplasticity of 9–12Cr steels

R.A. Barrett, P.E. O’Donoghue, S.B. Leen

Computational Materials Science > 2014 > 92 > C > 286-297

A dislocation-based model for high temperature cyclic viscoplasticity in 9–12Cr steels is presented. This model incorporates (i) cyclic softening via decrease in overall dislocation density, loss of low angle boundary dislocations and coarsening of the microstructure and (ii) kinematic hardening via precipitate strengthening and dislocation substructure hardening. The effects of the primary micro-structural...

article

An improved unified viscoplastic constitutive model for strain-rate sensitivity in high temperature fatigue

R.A. Barrett, P.E. O’Donoghue, S.B. Leen

International Journal of Fatigue > 2013 > 48 > Complete > 192-204

An improved unified cyclic viscoplastic material model for high temperature fatigue of P91 steel is presented. The primary enhancement over existing models is in relation to strain-rate independence of parameters, for accurate interpolation and extrapolation across a range of strain-rates and stress regimes, as relevant to flexible operation of high temperature power generation plant. The model combines...

article

The role of dietetics in a peripheral blood stem cell transplant (PBSCT) for Crohn's disease – A case report

R.A. Barrett, A.R. d'Eimar de Jabrun, A. Ansari, V. Bevan, more

Nutrition > 2008 > 24 > 5 > 505-506

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Search results for: R.A. Barrett

The effect of inclusions on the high‐temperature low‐cycle fatigue performance of cast MarBN: Experimental characterisation and computational modelling

A physically-based creep damage model for effects of different precipitate types

A dislocation-based model for high temperature cyclic viscoplasticity of 9–12Cr steels

An improved unified viscoplastic constitutive model for strain-rate sensitivity in high temperature fatigue

The role of dietetics in a peripheral blood stem cell transplant (PBSCT) for Crohn's disease – A case report

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