NickelMaghrebV1, Main, Exploration, bibRecord, 000729

A synergistic creep fatigue failure model damage (case of the alloy Z5NCTA at 550 °C)

Identifieur interne : 000729 ( Main/Exploration ); précédent : 000728; suivant : 000730

A synergistic creep fatigue failure model damage (case of the alloy Z5NCTA at 550 °C)

Auteurs : A. El Gharad [Maroc] ; H. Zedira [France] ; Z. Azari [France] ; G. Pluvinage [France]

Source :

Engineering fracture mechanics [ 0013-7944 ] ; 2006.

RBID : Pascal:06-0181071

Descripteurs français

Pascal (Inist)
- Rupture fluage, Rupture fatigue, Durée maintien, Fluage, Dommage cumulatif, Endommagement, Durée vie fatigue, Longueur fissure, Fatigue, Métal, Alliage base nickel, Modélisation, Loi puissance, Modèle Chaboche, Modèle hybride, Effet non linéaire, Ajustement modèle, Essai fluage, Essai fatigue, Etude expérimentale, Relaxation contrainte.
Wicri :
- topic : Métal.

English descriptors

KwdEn :
- Chaboche model, Crack length, Creep, Creep fracture, Creep test, Cumulative damage, Damaging, Experimental study, Fatigue, Fatigue fracture, Fatigue life, Fatigue test, Holding time, Hybrid model, Metal, Model matching, Modeling, Nickel base alloys, Non linear effect, Power law, Stress relaxation.

Abstract

Creep-fatigue tests have been performed on nickel base alloy Z5NCTA 33-21 grade 1. Hold time varied from 0, 10, 30, 90, 300, 1440 and 10,080 min at two values of strain range. It was found that the number of cycles to failure N_R decreases with holding time t_m, according to a power law: N_R = 1.88 × 10³ . (t_m)^-0.39. Prediction of number of cycles to failure for these conditions were made using 3 models which consider the interaction between fatigue and creep damage: Chaboche cumulative damage model, Levaillant creep damage model, and a new proposed synergistic model. This new model has been introduced to significantly reduce the number of adjustable parameters; 12 and 13 that are used versions of Chaboche and Levaillant's model to 3 in the proposed model. The new model uses a hybrid approach for damage (life fraction for fatigue, relative crack length for creep) and considers a multiplicative rather than an additive synergy of the damages. The two damage evolutions for fatigue and creep are strongly non-linear without incubation periods. The proposed model and the two previous models provide good correlation with experiments except for holding time less than 1000 min.

Affiliations:

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Le document en format XML

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<term>Endommagement</term>
<term>Durée vie fatigue</term>
<term>Longueur fissure</term>
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<front><div type="abstract" xml:lang="en">Creep-fatigue tests have been performed on nickel base alloy Z5NCTA 33-21 grade 1. Hold time varied from 0, 10, 30, 90, 300, 1440 and 10,080 min at two values of strain range. It was found that the number of cycles to failure N<sub>R</sub>
 decreases with holding time t<sub>m</sub>
, according to a power law: N<sub>R</sub>
 = 1.88 × 10<sup>3</sup>
 . (t<sub>m</sub>
)<sup>-0.39</sup>
. Prediction of number of cycles to failure for these conditions were made using 3 models which consider the interaction between fatigue and creep damage: Chaboche cumulative damage model, Levaillant creep damage model, and a new proposed synergistic model. This new model has been introduced to significantly reduce the number of adjustable parameters; 12 and 13 that are used versions of Chaboche and Levaillant's model to 3 in the proposed model. The new model uses a hybrid approach for damage (life fraction for fatigue, relative crack length for creep) and considers a multiplicative rather than an additive synergy of the damages. The two damage evolutions for fatigue and creep are strongly non-linear without incubation periods. The proposed model and the two previous models provide good correlation with experiments except for holding time less than 1000 min.</div>
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A synergistic creep fatigue failure model damage (case of the alloy Z5NCTA at 550 °C)

A synergistic creep fatigue failure model damage (case of the alloy Z5NCTA at 550 °C)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri