CONSTITUTIVE POTENTIAL FOR DUCTILE DAMAGED MATERIAL AND VOID GROWTH RATE

(整期优先)网络出版时间:1989-02-12
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Inthispaperageneralformulaforplasticpotentialincludingisotropicductiledamagehasbeenpresentedonthebasisofthethermodynamicsforirreversibleprocessandinternalvariablethe-ory.Withthisformulathemassconservationlawissatisfiedanditalsocontainsaseriesofunknowcoefficientswhicharethefunctionofmacroequivalentstressandtheaveragemicroequivalentstressandanunknownfunctionwhichisthefunctionoftwogeneralizedforces.Theapproximateyieldsurfaceequationforisotropicallydamagedmaterialsisdeveloped.Usingthisequationthevoidgrowthrateiscalculatedfornonlinearmaterialcontainingvoids.Thepresentre-sultsareingoodagreementwiththenumericalresultsgivenbythecellmodel.