Extrapolation of Sigmoidal Creep Curve by Strain Acceleration Parameter

Author:

Sato Hiroyuki1,Omote Kosuke1,Sato Akira1,Ueno Kouki1

Affiliation:

1. Hirosaki University

Abstract

It has been widely accepted that the creep characteristics at high temperatures are mainly evaluated by a minimum creep rate and a time to fracture. Although, a shape of creep curve may vary depending on deformation conditions, the apparent minimum creep rates may become the same value. Thus, for detailed analysis and prediction of creep behavior, other values should be considered which reflects the shape of each creep curve. For the purpose, authors have proposed Satos Strain-Acceleration-Parameter (SAP) which reflects strain rate change during creep. Based on the concept of SAP, the whole creep curve can be represented by a set of small numbers of numerical parameters, and can be extrapolated from a part of creep curve [. It is also well accepted that the creep rates depend on microstructures, and microstructural changes cause strain rate change. The SAP would reflect stability and magnitude of microstructural change during deformation at high temperatures. In this paper, application of the concept of SAP to creep curves that show sigmoidal type primary creep is presented. The creep curve can be divided into two regime based on the SAP values. The sigmoidal creep curve is reasonably reproduced by the concept of Strain-Acceleration-Parameter, and reasonably agrees with experiment. Whole creep curve can be reasonably represented by a few numerical values which reflect shape of creep curve in each regime. The concept of SAP is applicable for quantitative evaluation of both normal and sigmoidal type of creep curves.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference6 articles.

1. H. Sato and T. Miyano, J. Phys.: Conf. Ser. 240 012089 (2010).

2. A.K. Mukherjee, et al.: The Interaction Between Dislocations and Point Defects, Vol. II, Part III, ed. by B.L. Eyre, Atomic Energy Authority, Harwell, UK, (1968), pp.422-495.

3. H. Sato and K. Fujita, J. Japan Inst. Light Metals, 60 (2010), 353-355.

4. H. Sato: Supplemental Proceedings, Vol. 3, 137th Annual Meeting & Exhibition, TMS2008, (2008), 199-204.

5. H. Sato: Multiple Approach to Fracture of Materials, Composite and Structures, 17th European Conference on Fracture, Brno, ESIS, (2008), pp.1103-1110.

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