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Article Dans Une Revue International Journal of Microstructure and Materials Properties Année : 2008

Size effect in transient thermal fatigue testing and thermo-mechanical screening of coatings

Résumé

In an attempt to bring new ideas to thermal fatigue analysis of tools, we propose the principle of the two driving forces leading to damage by Thermal Fatigue (TF). After a definition of the two driving forces based on temperature and thermo-mechanical loadings, a procedure for evaluating them for in-service tools is proposed. In order to compare thermo-mechanical loadings in industrial tools to laboratory specimen, a normalisation of the thermo-mechanical equations is proposed. A size effect in those thermal mechanical problems is justified and used to set an original rule to design transient TF tests. In a second example related to coating tools or bi-materials tools, the concept of thermo-mechanical screening is explained: it corresponds to the optimum combination of materials properties leading to the vanishment of thermal stresses at the mating surface of a tool. An example is given that shows some conditions in which this can happen, depending on the combination of material properties. An example of application is then proposed.
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Dates et versions

hal-01847804 , version 1 (06-09-2018)

Identifiants

Citer

Gilles Dour, Farid Medjedoub, Gabriel Diaconu, Denis Girardin, Abderrahim Michrafy, et al.. Size effect in transient thermal fatigue testing and thermo-mechanical screening of coatings. International Journal of Microstructure and Materials Properties, 2008, 3 (2-3), pp.311-325. ⟨10.1504/IJMMP.2008.018737⟩. ⟨hal-01847804⟩
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