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dc.contributor.authorLeen, Sean B.
dc.identifier.citationDeshpande, AA,Leen, SB,Hyde, TH (2010) 'Finite element prediction of creep-plastic ratchetting and low cycle creep-fatigue for a large SPF tool'. Journal Of Materials Engineering And Performance, 19 :452-466.en_IE
dc.descriptionJournal articleen_IE
dc.description.abstractIndustrial experience shows that large superplastic forming (SPF) tools suffer from distortion due to thermal cycling, which apparently causes high temperature creep and plasticity. In addition to distortion, thermomechanical fatigue and fatigue-creep interaction can lead to cracking. The aim of this study is to predict the life-limiting thermomechanical behavior of a large SPF tool under realistic forming conditions using elastic-plastic-creep FE analyses. Nonlinear time-dependent, sequentially coupled FE analyses are performed using temperature-dependent monotonic and cyclic material data for a high-nickel, high-chromium tool material, XN40F (40% Ni and 20% Cr). The effect of monotonic and cyclic material data is compared vis-A -vis the anisothermal, elastic-plastic-stress response of the SPF tool. An uncoupled cyclic plasticity-creep material model is employed. Progressive deformation (ratchetting) is predicted locally, transverse to the predominant direction of the creep-fatigue cycling, but at the same spatial location, due to creep and cyclic plasticity, during the so-called minor cycles, which correspond to comparatively small-amplitude temperature changes associated with opening of the press doors during part loading and unloading operations.en_IE
dc.description.sponsorshipBAE Systemsen_IE
dc.publisherSpringer Verlagen_IE
dc.relation.ispartofJournal Of Materials Engineering And Performanceen
dc.subjectCreep ratchettingen_IE
dc.subjectHeating-cooling cyclesen_IE
dc.subjectMajor cycleen_IE
dc.subjectMinor cycleen_IE
dc.subjectPart-forming cyclesen_IE
dc.subjectPlastic shakedownen_IE
dc.subjectSuperplastic formingen_IE
dc.subjectThermomechanical fatigue and creepen_IE
dc.titleFinite element prediction of creep-plastic ratchetting and low cycle creep-fatigue for a large SPF toolen_IE
dc.local.contactSean Leen, Mechanical & Biomedical Eng, Eng-2051, New Engineering Building, Nui Galway. 5955 Email:

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