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
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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10169884
- Report Number(s):
- LA-12811-MS; ON: DE94015718
- Resource Relation:
- Other Information: PBD: Aug 1994
- Country of Publication:
- United States
- Language:
- English
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