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Title: Mechanical behavior of {sup 238}UO{sub 2}, {sup 238}PuO{sub 2}, and {sup 239}PuO{sub 2} as a function of strain rate and temperature

Abstract

The mechanical response of {sup 238}UO{sub 2} was measured as a function of strain rate and temperature. We evaluated material produced by two processing schedules: hot pressing followed by a grain stabilization; and cold pressing plus a sintering treatment. The response of these two materials was identical, within the scatter of our data. We complemented our data with that published in the literature, after having made the appropriate corrections for grain size, porosity, and stoichiometry. The entire collection of data was used to evaluate the Follansbee-Kocks mechanical threshold stress (MTS) model for the prediction of yield stress as a function of strain rate and temperature. We used this model to predict the yield stress of {sup 238}UO{sub 2} for strain rates between {dot {var_epsilon}} = 10{sup {minus}5} and 10{sup 3} s{sup {minus}1} and temperatures from 800 to 1600C. These predictions provided the basis for constructing a deformation/fracture map for both urania and plutonia. Examination of the maps indicates that for compressive loading and impact strain rates, the {sup 238}UO{sub 2} will be an excellent mock material for {sup 238}PuO{sub 2}. Under these conditions both the strength and deformation and the fracture modes are consistent between these two materials.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10169884
Report Number(s):
LA-12811-MS
ON: DE94015718
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1994
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 07 ISOTOPES AND RADIATION SOURCES; URANIUM DIOXIDE; MECHANICAL PROPERTIES; URANIUM 238; FRACTURES; DEFORMATION; YIELD STRENGTH; COMPARATIVE EVALUATIONS; PLUTONIUM 238; PLUTONIUM DIOXIDE; SIMULATION; RADIOISOTOPE BATTERIES; THERMOELECTRIC GENERATORS; 400702; 050700; 070300; PROPERTIES OF RADIOACTIVE MATERIALS; FUELS PRODUCTION AND PROPERTIES; ISOTOPIC POWER SUPPLIES

Citation Formats

Stout, M G, Ellis, R W, and Pereyra, R A. Mechanical behavior of {sup 238}UO{sub 2}, {sup 238}PuO{sub 2}, and {sup 239}PuO{sub 2} as a function of strain rate and temperature. United States: N. p., 1994. Web. doi:10.2172/10169884.
Stout, M G, Ellis, R W, & Pereyra, R A. Mechanical behavior of {sup 238}UO{sub 2}, {sup 238}PuO{sub 2}, and {sup 239}PuO{sub 2} as a function of strain rate and temperature. United States. https://doi.org/10.2172/10169884
Stout, M G, Ellis, R W, and Pereyra, R A. 1994. "Mechanical behavior of {sup 238}UO{sub 2}, {sup 238}PuO{sub 2}, and {sup 239}PuO{sub 2} as a function of strain rate and temperature". United States. https://doi.org/10.2172/10169884. https://www.osti.gov/servlets/purl/10169884.
@article{osti_10169884,
title = {Mechanical behavior of {sup 238}UO{sub 2}, {sup 238}PuO{sub 2}, and {sup 239}PuO{sub 2} as a function of strain rate and temperature},
author = {Stout, M G and Ellis, R W and Pereyra, R A},
abstractNote = {The mechanical response of {sup 238}UO{sub 2} was measured as a function of strain rate and temperature. We evaluated material produced by two processing schedules: hot pressing followed by a grain stabilization; and cold pressing plus a sintering treatment. The response of these two materials was identical, within the scatter of our data. We complemented our data with that published in the literature, after having made the appropriate corrections for grain size, porosity, and stoichiometry. The entire collection of data was used to evaluate the Follansbee-Kocks mechanical threshold stress (MTS) model for the prediction of yield stress as a function of strain rate and temperature. We used this model to predict the yield stress of {sup 238}UO{sub 2} for strain rates between {dot {var_epsilon}} = 10{sup {minus}5} and 10{sup 3} s{sup {minus}1} and temperatures from 800 to 1600C. These predictions provided the basis for constructing a deformation/fracture map for both urania and plutonia. Examination of the maps indicates that for compressive loading and impact strain rates, the {sup 238}UO{sub 2} will be an excellent mock material for {sup 238}PuO{sub 2}. Under these conditions both the strength and deformation and the fracture modes are consistent between these two materials.},
doi = {10.2172/10169884},
url = {https://www.osti.gov/biblio/10169884}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 1994},
month = {Mon Aug 01 00:00:00 EDT 1994}
}