Bouvard, Jean-Luc (2006) Crack growth modelling in the single-crystal turbine blades. PhD thesis Sciences et Génie des matériaux, ENSMP - Centre des Matériaux P.M. Fourt, ENSMP.
Abstract
The aim of this study is first to develop a simulation methodology of crack growth under cycling loading by using a coupled approach. This methodology uses cohesive zone elements coupled with a specific constitutive behaviour in order to simulate the crack growth without discontinuity and with a predictive character. We have then developed a phenomenological model of crack growth, based on linear fracture mechanics, which takes into account the effects of short cracks and, at high temperature, the creep and oxidation effects on the crack growth rate. The aim of this model is to provide Design Offices with a tool for predicting the failure of industrial components (such as turbine blades), which is rapid and easy to use.
This study contains many crack growth measurements, which supported the development of a local approach based on cohesive zone models for the numerical simulation of crack growth. However, in future applications, this approach can provide data on the complex coupling between plasticity at crack tip and crack growth phenomena in order to improve the phenomenological models for their application in Design Offices
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Chaboche, Jean-Louis |
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| Date: | November 2006 |
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| Board of examiners: | Prioul, Claude and Desmorat, Rodrigue and Busso, Esteban and Fedelich, Bernard and Chaboche, Jean-Louis and Gallerneau, Franck and Sanson, Arnaud |
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| Discipline: | Sciences et Génie des matériaux |
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| Collection (Fonds): | ENSMP |
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| Institution: | ENSMP |
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| Department: | ENSMP - Centre des Matériaux P.M. Fourt |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Monocristal, Superalliage, Fatigue, Fluage, Oxydation, élements de zone cohésive, Endommagement, Modèle phénoménologique de propagation |
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