Normalized thermal stresses analysis to design a thermal fatigue experiment

Abstract : This paper summarizes the thermal fatigue testing conditions that can be found in the literature about shape‐forming tools. The importance of the local geometry of the tools is discussed. The key point of the study is to demonstrate that a reproduction of thermal fatigue conditions must take into account a size effect: the same apparent thermal shock does not have the same effect in a large, thick tool as it has in a small, thin laboratory specimen. This paper proposes a method to evaluate what kind of thermal shock to perform on the laboratory specimen to replicate a thermal shock observed in the large and thick tool. A global method of design of a thermal fatigue experiment is given for a cylindrical specimen, provided that the maximum temperature, maximum thermal stresses, and the corresponding time in the cycle have been previously determined A method to determine the required data is proposed. A definition of the intensity of the thermal shocks is proposed and damages on specimen surfaces are illustrated with regard to that definition.
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Gilles Dour, Farid Medjedoub, Sabine Le Roux, Gabriel Diaconu, Farhad Rezai-Aria. Normalized thermal stresses analysis to design a thermal fatigue experiment. JOURNAL OF THERMAL STRESSES, 2005, 28 (1), pp.1-16. ⟨10.1080/014957390523651⟩. ⟨hal-01666712⟩

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