Journal ArticleDOI
Yield behavior of porous nuclear fuel (UO2)
Reads0
Chats0
TLDR
In this paper, a finite element-based homogenization technique has been used to map the yield surface of UO2 with pressurized porosity, and it was found that the yield strength decreases with an increase in porosity for a given internal pore pressure.Abstract:
Uranium dioxide (UO2) is one of the most common nuclear fuels. During burn-up, the fuel undergoes substantial microstructural changes including the formation of pressurized pores, thus becoming a porous material. These pores reduce the elastic modulus and alter the yield behavior of the material. In this work, a finite-element-based homogenization technique has been used to map the yield surface of UO2 with pressurized pores. Two scenarios are considered; in the first, the fuel matrix is a ductile material with a Von-mises type behavior, while in the second, the matrix is quasi brittle, which is simulated using the concrete damaged plasticity (CDP) model available in ABAQUS. For both of the scenarios, it is found that the yield strength decreases with an increase in porosity for a given internal pore pressure. For a given porosity, the yield surface shifts towards the negative hydrostatic axis in the Haigh-Westergard stress space with an increase in pore pressure. When the matrix is quasi brittle,...read more
Citations
More filters
Journal ArticleDOI
Determination of elastic properties of polycrystalline U3Si2 using resonant ultrasound spectroscopy
TL;DR: In this paper, the elastic properties of U3Si2 at room temperature have been measured via resonant ultrasound spectroscopy and the average value of Young's and the bulk modulus for U3 Si2 are shown to be 130.4 ± 0.5 and 68.3 ± 1.5 GPa, respectively.
Journal Article
Effects of porosity on elastic modulus of UO2
TL;DR: In this article, the effects of porosity on the Young's and the shear moduli, and the Poisson's ratio of uranium dioxide samples with various porosities were investigated at room temperature.
References
More filters
Journal ArticleDOI
Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements
TL;DR: In this article, fracture mechanics is introduced into finite element analysis by means of a model where stresses are assumed to act across a crack as long as it is narrowly opened, which may be regarded as a way of expressing the energy adsorption in the energy balance approach.
Journal ArticleDOI
Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements
TL;DR: In this article, fracture mechanics is introduced into finite element analysis by means of a model where stresses are assumed to act across a crack as long as it is narrowly opened, which may be regarded as a way of expressing the energy adsorption in the energy balance approach.
Journal ArticleDOI
Elastic properties of reinforced solids: some theoretical principles
TL;DR: In this paper, an elementary account of several theoretical methods of attack is given, among them the derivation of inequalities between various moduli, and the approach is completely general and exact.
Journal ArticleDOI
A plastic-damage model for concrete
TL;DR: In this article, a constitutive model based on an internal variable-formulation of plasticity theory for the non-linear analysis of concrete is presented, which uses a new yield criterion which matches experimental data quite well and it accounts for both elastic and plastic stiffness degradations effects.
Related Papers (5)
Modelling of the multiaxial elasto-plastic behaviour of porous metals with internal gas pressure
Andreas Öchsner,Gennady Mishuris +1 more