Modeling of the Constitutive Behavior of Inconel 718 at Intermediate Temperatures
2011 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, Vol. 133, 094501-1-094501-4 p.Article in journal (Refereed) Published
Turbine disks are of large importance to turbine designers as theyare exposed to hot environment and subjected to high loads. Inorder to analyze such components with respect to fatigue crackinitiation, the work generally starts with a rigorous analysis of thefirst few cycles, during which an important stress redistributionwill always take place in an inelastic structure. In this work, thenonlinear kinematic hardening law by Ohno and Wang (1998,“Constitutive Modeling of Cyclic Plasticity With Emphasis onRatchetting,” Int. J. Mech. Sci., 40, pp. 251–261) has been used incombination with an isotropic softening law for describing theinitial stress-strain distribution for strain controlled uniaxial testsof the material Inconel 718. Focus has been placed on finding asimple model with few material parameters and to describe theinitial softening and the comparatively small mean stress relaxationobserved during the material testing. The simulation resultsobtained by using the model fit the experimental resultswell.
Place, publisher, year, edition, pages
ASME , 2011. Vol. 133, 094501-1-094501-4 p.
IdentifiersURN: urn:nbn:se:liu:diva-68035DOI: 10.1115/1.4002913ISI: 000290494800020OAI: oai:DiVA.org:liu-68035DiVA: diva2:415255