SEDL / STP / STP1371-EB / STP15263S

Thermal-mechanical Fatigue and the Modelling of Materials Behaviour Under Thermal Transients

Rémy, L
Centre des Matériaux, Ecole des Mines de Paris, Evry,

Koster, A
Centre des Matériaux, Ecole des Mines de Paris, Evry,

Chataigner, E


Bickard, A

Pages: 16    Published: Jan 2000

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Abstract

Thermal-mechanical fatigue is addressed using the following methodology: volume element tests are used to check constitutive models as well as to investigate synergy effects and damage models. Structure tests as in thermal shock are used to validate models. This methodology is applied to two gas turbine materials: a wrought polycrystalline alloy, Superwaspaloy, for moderate temperature use, and aluminized single crystal AMI superalloy for blades. The capabilities of viscoplastic constitutive models with internal variables are illustrated. A damage model is shown which describes the synergy between oxidation, creep and fatigue. Detrimental effects of aluminide coating for specific thermal mechanical loading paths are tentatively rationalized.