On the fracture toughness of irradiated F82H: Effects of loss of constraint and strain hardening capacity

T. Yamamoto; G. R. Odette; M. A. Sokolov

doi:10.1016/j.jnucmat.2010.12.102

On the fracture toughness of irradiated F82H: Effects of loss of constraint and strain hardening capacity

T. Yamamoto, G. R. Odette, M. A. Sokolov

Advanced Nuclear Materials

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Constraint loss adjustments, based on finite element (FE) stress analysis and local critical stress, σ*, critical stressed volume, V*, cleavage criteria were applied to fracture toughness data from small pre-cracked bend bars of the IEA heat of F82H irradiated to 6.6 dpa at 300 °C in the High Flux Isotope Reactor. The 100 MPa√m master curve method reference temperature shifts were evaluated based on both the measured toughness (ΔT_m) and after size-adjusting the toughness to small-scale yielding conditions at reference specimen size (ΔT_o) with values of ≈142 and 205 °C, respectively. The model based prediction ΔT_o = C_oΔσ_fl〉, where C_o ≈ 0.68 and Δσ_fl〉 is the change in the average flow stress over 0-10% strain is in excellent agreement with ΔT_o. The FE analyses also demonstrates an upper-bound K _Jc that can be measured with these small bend bars for irradiated alloys that suffer severe loss of strain hardening.

Original language	English
Pages (from-to)	115-119
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	417
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2010.12.102
State	Published - Oct 1 2011

Funding

Experimental data used in this study were obtained in collaboration with Oak Ridge National Laboratory, Pacific Northwest National Laboratory and Japan Atomic Energy Agency. The authors are grateful to Drs. Steve Zinkle, Roger Stoller, Shiro Jitsukawa, Hiroyasu Tanigawa and other researchers involved in the US-JAEA collaboration. The research performed at University of California, Santa Barbara was supported by the US Department of Energy, Office of Fusion Science Grant #DE-FG03-94ER54275.

Funders	Funder number
Office of Fusion Science	-FG03-94ER54275
US Department of Energy
University of California, Santa Barbara

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abstract = "Constraint loss adjustments, based on finite element (FE) stress analysis and local critical stress, σ*, critical stressed volume, V*, cleavage criteria were applied to fracture toughness data from small pre-cracked bend bars of the IEA heat of F82H irradiated to 6.6 dpa at 300 °C in the High Flux Isotope Reactor. The 100 MPa√m master curve method reference temperature shifts were evaluated based on both the measured toughness (ΔTm) and after size-adjusting the toughness to small-scale yielding conditions at reference specimen size (ΔTo) with values of ≈142 and 205 °C, respectively. The model based prediction ΔTo = CoΔσfl〉, where Co ≈ 0.68 and Δσfl〉 is the change in the average flow stress over 0-10% strain is in excellent agreement with ΔTo. The FE analyses also demonstrates an upper-bound K Jc that can be measured with these small bend bars for irradiated alloys that suffer severe loss of strain hardening.",

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On the fracture toughness of irradiated F82H: Effects of loss of constraint and strain hardening capacity

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