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Measurement of Tensile Properties Dependent on the Small-Scaled Specimen Dimension for Evaluation of In-Service Materials Properties  

Huh, Yong-Hak (Division of Metrology for Quality Life, Korea Research Institute of Standards and Science)
Kim, Dong-Iei (Division of Metrology for Quality Life, Korea Research Institute of Standards and Science)
Kim, Dong-Jin (Division of Metrology for Quality Life, Korea Research Institute of Standards and Science)
Lee, Hae-Moo (Division of Metrology for Quality Life, Korea Research Institute of Standards and Science)
Park, Jong-Seo (Division of Metrology for Quality Life, Korea Research Institute of Standards and Science)
Publication Information
Journal of the Korean Society of Safety / v.23, no.5, 2008 , pp. 30-34 More about this Journal
Abstract
To evaluate the mechanical properties of in-service materials, tensile properties measurement using small-scaled specimen has been carried out. Tensile testing specimens with various dimensions, including standard and sub-size specimen specified in ASTM and ISO and small-scaled specimen, were prepared. Tensile strain in small-scaled specimen was measured using micro-ESPI system set up in this study. This system was used in the specimen with the parallel length of 2 mm and in subsequently measuring the strain under tensile loading. From each type of tensile specimen, stress-strain curves were determined. The dimension effect of the tensile properties was investigated comparing the tensile results obtained from standard specimens and small-scaled specimens. It was shown that the tensile strength for the small-scaled specimen is lower by 15% than those for the standard specimen.
Keywords
small-scaled specimen; tensile testing; in-service materials; micro-ESPI(electronic speckle pattern interferometry);
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  • Reference
1 J.D. Parker and L.H. Bisbee, "Monitoring in-service changes in materials properties", Proc Instn. Mechanic. Engrs. Vol. 206, pp. 209-216, 1992
2 D.G. Doran; Test Volume Considerations for an IFMIF; IEA-WG Report, Washington State University, 1993
3 ASTM E112-96, "Standard method for determining average grain size"
4 D. Mercaldi and J. Parker, "Material sampling for rotor evaluation", EPRI Conference "Assessment of turbine generators", Charlotte (North Carolina), 1989
5 Y.H. Huh, D.I. Kim, D.J. Kim, P. Park, C.D. Kee and J.H. Park, "Application of micro-ESPI technique for measurement of micro-tensile properties", Key Eng. Materials Vol. 270, pp. 744-749, 2004   DOI
6 R.D. Townsend, "Procedures used by Central Electricity Generating Board for component life assessment", Proceeding. of Conference on Refurbishment and Life Extension of Steam Plant. Pp 223229. London: Institution of Mechanical Engineers, pp. 223-235, 1987
7 A. Garzillo, C. Guardamagna., L. Moscotti, L, Ranzani, "A technique for the residual life assessment of high temperature components based on creep rupture testing on welded miniature specimens", Int. J. Pres. Ves. & Piping, Vol. 66, pp. 223-232 1996   DOI   ScienceOn
8 J. Douglas, "High value for condition Assessment", EPRI Journal, Vol. 21, pp. 26-34, 1996
9 V. Bicego, M. Certo, C. Sanpietri, F. Bregani, "Non destructive material creep damage evaluation in service exposed components: ENEL experience", Presented at EPRI-workshop, "NDE for Damage Assessment", 6-7 Oct., 1997