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8.911 Lectures/texts in conference proceedings
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  • IV International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED 2011) Kos, Greece, 20-22 June, 2011
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Application of a viscoplastic damage model for the failure prediction of regeneratively cooled nozzle structures

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hdl:2117/328228

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Tini, Vivian
Vladimirov, Ivaylo N.
Reese, Stefanie
Document typeConference report
Defense date2011
PublisherCIMNE
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Regeneratively cooled nozzle structures belong to the critical components of a space shuttle main engine. The cooling channel wall in the combustion chamber is subjected to extreme cyclic thermomechanical loadings which eventually lead to the damage of the wall, well known as the ”dog-house” effect. A material model for the purpose of reliable lifetime prediction is being developed. The model shall describe the material behaviour under hardening conditions as well as the superimposed effect of fatigue which occurs due to cyclic loadings. Motivated by extending the classical rheological model for elastoplasticity with Armstrong- Frederick kinematic hardening, a viscoplastic model is formulated in the small strain regime. The coupling with damage is performed using the well-known concept of effective stress and the principle of strain equivalence. Parameter identification on the basis of experimental results for the high temperature copper alloy NARloy-Z, which is one of the typical cooling channel liner materials, is performed. The applicability of the model will be shown by means of sequentially coupled thermomechanical analyses.
CitationTini, V.; Vladimirov, I.N.; Reese, S. Application of a viscoplastic damage model for the failure prediction of regeneratively cooled nozzle structures. A: COUPLED IV. "COUPLED IV : proceedings of the IV International Conference on Computational Methods for Coupled Problems in Science and Engineering". CIMNE, 2011, p. 1332-1341. ISBN 978-84-89925-78-6. 
URIhttp://hdl.handle.net/2117/328228
ISBN978-84-89925-78-6
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  • International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED) - IV International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED 2011) Kos, Greece, 20-22 June, 2011 [128]
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