A master curve analysis of F82H using statistical and constraint loss size adjustments of small specimen data

G. R. Odette; T. Yamamoto; H. Kishimoto; M. Sokolov; P. Spätig; W. J. Yang; J. W. Rensman; G. E. Lucas

doi:10.1016/j.jnucmat.2004.04.255

A master curve analysis of F82H using statistical and constraint loss size adjustments of small specimen data

G. R. Odette, T. Yamamoto, H. Kishimoto, M. Sokolov, P. Spätig, W. J. Yang, J. W. Rensman, G. E. Lucas

Advanced Nuclear Materials

Research output: Contribution to journal › Conference article › peer-review

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Abstract

We assembled a fracture toughness database for the IEA heat of F82H based on a variety of specimen sizes with a nominal ASTM E1921 master curve (MC) reference temperature T₀=-119 ± 3 °C. However, the data are not well represented by a MC. T₀ decreases systematically with a decreasing deformation limit M_lim starting at ≈200, which is much higher than the E1921 censoring limit of 30, indicating large constraint loss in small specimens. The small scale yielding T₀ at high M_lim is ≈98±5 °C. While, the scatter was somewhat larger than predicted, after model-based adjustments for the effects of constraint loss, the data are in reasonably good agreement with a MC with T₀ = -98 °C. This supports to use of MC methods to characterize irradiation embrittlement, as long as both constraint loss and statistical size effects are properly accounted for. Finally, we note various issues, including sources of the possible excess scatter, which remain to be fully assessed.

Original language	English
Pages (from-to)	1243-1247
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	329-333
Issue number	1-3 PART B
DOIs	https://doi.org/10.1016/j.jnucmat.2004.04.255
State	Published - Aug 1 2004
Event	Proceedings of the 11th Conference on Fusion Research - Kyoto, Japan Duration: Dec 7 2003 → Dec 12 2003

Funding

This research was supported by the DOE Office of Fusion Energy Science (Grant # DE-FG03-94ER54275). The authors also explicitly acknowledge the large IEA F82H database developed by Dr. K. Wallin of VTT Laboratory in Finland.

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10.1016/j.jnucmat.2004.04.255

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title = "A master curve analysis of F82H using statistical and constraint loss size adjustments of small specimen data",

abstract = "We assembled a fracture toughness database for the IEA heat of F82H based on a variety of specimen sizes with a nominal ASTM E1921 master curve (MC) reference temperature T0=-119 ± 3 °C. However, the data are not well represented by a MC. T0 decreases systematically with a decreasing deformation limit Mlim starting at ≈200, which is much higher than the E1921 censoring limit of 30, indicating large constraint loss in small specimens. The small scale yielding T0 at high Mlim is ≈98±5 °C. While, the scatter was somewhat larger than predicted, after model-based adjustments for the effects of constraint loss, the data are in reasonably good agreement with a MC with T0 = -98 °C. This supports to use of MC methods to characterize irradiation embrittlement, as long as both constraint loss and statistical size effects are properly accounted for. Finally, we note various issues, including sources of the possible excess scatter, which remain to be fully assessed.",

author = "Odette, {G. R.} and T. Yamamoto and H. Kishimoto and M. Sokolov and P. Sp{\"a}tig and Yang, {W. J.} and Rensman, {J. W.} and Lucas, {G. E.}",

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AU - Odette, G. R.

AU - Yamamoto, T.

AU - Kishimoto, H.

AU - Sokolov, M.

AU - Spätig, P.

AU - Yang, W. J.

AU - Rensman, J. W.

AU - Lucas, G. E.

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N2 - We assembled a fracture toughness database for the IEA heat of F82H based on a variety of specimen sizes with a nominal ASTM E1921 master curve (MC) reference temperature T0=-119 ± 3 °C. However, the data are not well represented by a MC. T0 decreases systematically with a decreasing deformation limit Mlim starting at ≈200, which is much higher than the E1921 censoring limit of 30, indicating large constraint loss in small specimens. The small scale yielding T0 at high Mlim is ≈98±5 °C. While, the scatter was somewhat larger than predicted, after model-based adjustments for the effects of constraint loss, the data are in reasonably good agreement with a MC with T0 = -98 °C. This supports to use of MC methods to characterize irradiation embrittlement, as long as both constraint loss and statistical size effects are properly accounted for. Finally, we note various issues, including sources of the possible excess scatter, which remain to be fully assessed.

AB - We assembled a fracture toughness database for the IEA heat of F82H based on a variety of specimen sizes with a nominal ASTM E1921 master curve (MC) reference temperature T0=-119 ± 3 °C. However, the data are not well represented by a MC. T0 decreases systematically with a decreasing deformation limit Mlim starting at ≈200, which is much higher than the E1921 censoring limit of 30, indicating large constraint loss in small specimens. The small scale yielding T0 at high Mlim is ≈98±5 °C. While, the scatter was somewhat larger than predicted, after model-based adjustments for the effects of constraint loss, the data are in reasonably good agreement with a MC with T0 = -98 °C. This supports to use of MC methods to characterize irradiation embrittlement, as long as both constraint loss and statistical size effects are properly accounted for. Finally, we note various issues, including sources of the possible excess scatter, which remain to be fully assessed.

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VL - 329-333

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ER -

A master curve analysis of F82H using statistical and constraint loss size adjustments of small specimen data

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