Modeling of the constitutive behavior of inconel 718 at intermediate temperatures / D. Gustafsson in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 9 (Septembre 2011)  

Public ISBD [article]  inTransactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 9 (Septembre 2011) . - 04 p. Titre : Modeling of the constitutive behavior of inconel 718 at intermediate temperatures Type de document : texte imprimé Auteurs : D. Gustafsson, Auteur ; J. J. Moverare, Auteur ; K. Simonsson, Auteur Année de publication : 2012 Article en page(s) : 04 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Chromium alloys Fatigue cracks Gas turbines Hardening Nickel Softening Stress relaxation Stress-strain relations Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Turbine disks are of large importance to turbine designers as they are exposed to hot environment and subjected to high loads. In order to analyze such components with respect to fatigue crack initiation, the work generally starts with a rigorous analysis of the first few cycles, during which an important stress redistribution will always take place in an inelastic structure. In this work, the nonlinear kinematic hardening law by Ohno and Wang (1998, “Constitutive Modeling of Cyclic Plasticity With Emphasis on Ratchetting,” Int. J. Mech. Sci., 40, pp. 251–261) has been used in combination with an isotropic softening law for describing the initial stress-strain distribution for strain controlled uniaxial tests of the material Inconel 718. Focus has been placed on finding a simple model with few material parameters and to describe the initial softening and the comparatively small mean stress relaxation observed during the material testing. The simulation results obtained by using the model fit the experimental results well. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Modeling of the constitutive behavior of inconel 718 at intermediate temperatures [texte imprimé] / D. Gustafsson, Auteur ; J. J. Moverare, Auteur ; K. Simonsson, Auteur . - 2012 . - 04 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 9 (Septembre 2011) . - 04 p. Mots-clés : Chromium alloys Fatigue cracks Gas turbines Hardening Nickel Softening Stress relaxation Stress-strain relations Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Turbine disks are of large importance to turbine designers as they are exposed to hot environment and subjected to high loads. In order to analyze such components with respect to fatigue crack initiation, the work generally starts with a rigorous analysis of the first few cycles, during which an important stress redistribution will always take place in an inelastic structure. In this work, the nonlinear kinematic hardening law by Ohno and Wang (1998, “Constitutive Modeling of Cyclic Plasticity With Emphasis on Ratchetting,” Int. J. Mech. Sci., 40, pp. 251–261) has been used in combination with an isotropic softening law for describing the initial stress-strain distribution for strain controlled uniaxial tests of the material Inconel 718. Focus has been placed on finding a simple model with few material parameters and to describe the initial softening and the comparatively small mean stress relaxation observed during the material testing. The simulation results obtained by using the model fit the experimental results well. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]

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