Many components in conventional and nuclear power plant, aero-engines, chemical plant etc., operate at temperatures which are high enough for creep to occur. These include plain pipes, pipe bends, branched pipes etc., the manufacture of such components may also require welds to be inserted in them. In most cases, only nominal operating conditions (i.e., pressure, temperatures, system load, etc.) are known and hence precise life predictions are not possible. Also, the proportion of life consumed will vary from position to position within a component and the plant. Hence, nondestructive techniques are adopted to assist in making decisions on whether to repair, continue operating or scrap certain components. One such approach is to use scoop samples removed from the components to make small creep test specimens, i.e., sub-size uniaxial creep test specimens, impression creep test specimens, small punch creep test specimens, and small ring (circular or elliptical) creep test specimens. Each specimen type has its own unique advantages and disadvantages and it may not be obvious which one is the most appropriate test method to use. This paper gives a brief description of each specimen and associated test type and describes their practical limitations. The suitability of each of the methods for determining “bulk” material properties is described and it is shown that an appropriate test type can be chosen.
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April 2014
Technical Briefs
A Basis for Selecting the Most Appropriate Small Specimen Creep Test Type
T. H. Hyde,
Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
T. H. Hyde
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
Search for other works by this author on:
C. J. Hyde,
Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
C. J. Hyde
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
Search for other works by this author on:
W. Sun
Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
W. Sun
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
Search for other works by this author on:
T. H. Hyde
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
C. J. Hyde
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
W. Sun
Department of Mechanical
,Materials and Manufacturing Engineering,
The University of Nottingham,
University Park,
Nottingham NG7 2RD
, UK
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 23, 2012; final manuscript received October 24, 2013; published online January 7, 2014. Assoc. Editor: Osamu Watanabe.
J. Pressure Vessel Technol. Apr 2014, 136(2): 024502 (6 pages)
Published Online: January 7, 2014
Article history
Received:
August 23, 2012
Revision Received:
October 24, 2013
Citation
Hyde, T. H., Hyde, C. J., and Sun, W. (January 7, 2014). "A Basis for Selecting the Most Appropriate Small Specimen Creep Test Type." ASME. J. Pressure Vessel Technol. April 2014; 136(2): 024502. https://doi.org/10.1115/1.4025864
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