Thermal-Fatigue Resistance: Material, Geometric, and Temperature Field Considerations
Data from four kinds of thermal-fatigue tests and from three materials are presented as a basis for a discussion of the influence of material, geometry, and the temperature field on the temperature range versus life relationship for thermal fatigue. A method is given whereby the results of the tests of internally constrained specimens can be compared with results from tests of externally constrained specimens. By appropriate design of a circular disk specimen either the radial or the tangential stress can be selected as the cyclic principal stress. Thermal-fatigue data from three materials are used to show that the plastic-strain range versus life relationship is not a sufficient criterion of merit when rating materials for thermal-fatigue resistance.