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Coherent view of creep and fatigue

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Abstract

It is known that determination of the service life of structures under loading at elevated temperatures is carried out on the basis of time-consuming creep and fatigue tests. It is not possible to do without the tests now; however, the problem is to organize them in a more rational way from the technical and economical points of view. For the achievement of this purpose a method is offered. Various alloys based on the same metal are grouped by the structural criterion using the yield stress as an additional characteristic of the metal. It is convenient since the yield stress value is specified by the same system of obstacles, interfering with the movement of dislocations, on which other properties of the alloy depend. The physical relations descriptive of the structural parameters and yield stress are the most reliable ones. The physical model of metal or relations descriptive of its mechanical properties are transformed in such a manner that they become valid for the group of alloys as a whole. The correlation between the properties and the yield stress is confirmed with a high statistical reliability. As a result, the mean value and the scatter of the characteristics of each alloy can be determined directly using the correlation dependences for an appropriate alloy group. By means of the offered method it is possible to calculate directly the alloy low-cycle life. An example verifying the utility of the method is presented.

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Authors and Affiliations

  1. Budapest, Hungary

    K. Lehofer

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  1. K. Lehofer
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Published inProblemy Prochnosti, Nos. 1–2, pp. 126–136, January–February, 1995.

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Lehofer, K. Coherent view of creep and fatigue. Strength Mater 27, 88–95 (1995). https://doi.org/10.1007/BF02206417

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  • DOI: https://doi.org/10.1007/BF02206417

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