Modeling nonlinear electromechanical behavior of shocked silicon carbide

Clayton, John D.

doi:10.1063/1.3277030

Cited by 47 publications

(24 citation statements)

References 88 publications

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“…For 6H-SiC the Peierls stress is about an order of magnitude higher than for α-Fe, viz. 0.7 GPa for a prism edge dislocation and 1.24 MPa for a basal 60° dislocation [196]. Based on these numbers and the mechanical properties of SiC [49] it is reasonable to expect that the deeper radiation damage in Figure 8 can be ascribed to stress-induced dislocation movement.…”

Section: Annealing Of Radiation Damagementioning

confidence: 96%

Diffusion of fission products and radiation damage in SiC

Malherbe

2013

J. Phys. D: Appl. Phys.

104

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A major problem with most of the present nuclear reactors is their safety in terms of the release of radioactivity into the environment during accidents. In some of the future nuclear reactor designs, i.e. Generation IV reactors, the fuel is in the form of coated spherical particles, i.e. TRISO (acronym for Triple Coated Isotropic) particles. The main function of these coating layers is to act as diffusion barriers for radioactive fission products, thereby keeping these fission products within the fuel particles, even under accident conditions. The most important coating layer is composed of polycrystalline 3C-SiC. This paper reviews the diffusion of the important fission products (silver, caesium, iodine and strontium) in SiC. Because radiation damage can induce and enhance diffusion, the paper also briefly reviews damage created by energetic neutrons and ions at elevated temperatures, i.e. the temperatures at which the modern reactors will operate, and the annealing of the damage. The interaction between SiC and some fission products (such as Pd and I) is also briefly discussed. As shown, one of the key advantages of SiC is its radiation hardness at elevated temperatures, i.e. SiC is not amorphized by neutron or bombardment at substrate temperatures above 350°C. Based on the diffusion coefficients of the fission products considered, the review shows that at the normal operating temperatures of these new reactors (i.e. less than 950°C) the SiC coating layer is a good diffusion barrier for these fission products. However, at higher temperatures the design of the coated particles needs to be adapted, possibly by adding a thin layer of ZrC.

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Section: Annealing Of Radiation Damagementioning

confidence: 96%

Diffusion of fission products and radiation damage in SiC

Malherbe

2013

J. Phys. D: Appl. Phys.

104

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“…Rizk [37,38] obtained the transient thermal stress intensity factors for an orthotropic semi-infinite plate and two bonded dissimilar materials. Clayton [39] developed an anisotropic ceramic crystals model to investigate the nonlinear electromechanical behaviour of silicon carbide subjected to high shock temperatures. The influence of the temperature dependence of the material properties on the thermal shock fracture of ceramics was investigated experimentally by Nishikawa et al [40].…”

Section: Introductionmentioning

confidence: 99%

Thermal shock fracture mechanics analysis of a semi-infinite medium based on the dual-phase-lag heat conduction model

Wang

Yang

2015

Proc. R. Soc. A.

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ResearchCite this article: Wang B, Li JE, Yang C. 2015 Thermal shock fracture mechanics analysis of a semi-infinite medium based on the dual-phase-lag heat conduction model. The generalized lagging behaviour in solids is very important in understanding heat conduction in smallscale and high-rate heating. In this paper, an edge crack in a semi-infinite medium subjected to a heat shock on its surface is studied under the framework of the dual-phase-lag (DPL) heat conduction model. The transient thermal stress in the medium without crack is obtained first. This stress is used as the crack surface traction with an opposite sign to formulate the crack problem. Numerical results of thermal stress intensity factor are obtained as the functions of crack length and thermal shock time. Crack propagation predictions are conducted and results based on the DPL model and those based on the classical Fourier heat conduction model are compared. The thermal shock strength that the medium can sustain without catastrophic failure is established according to the maximum local stress criterion and the stress intensity factor criterion.

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“…Specific ceramics under consideration include silicon carbide (6H polytype as most prevalent in SiC-N, hexagonal structure) and AlON (spinel, cubic structure). Detailed descriptions and continuum models of behavior of single crystals of each material with supporting references are given elsewhere (Clayton, 2010c(Clayton, , 2011a. Notably, polycrystalline AlON of adequate quality is transparent, while polycrystalline SiC is opaque.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

Clayton

Kraft

Leavy

2012

International Journal of Solids and Structures

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a b s t r a c tDynamic deformation and failure mechanisms in polycrystalline ceramics are investigated through constitutive modeling and numerical simulation. Two ceramics are studied: silicon carbide (SiC, hexagonal crystal structure) and aluminum oxynitride (AlON, cubic crystal structure). Three dimensional finite element simulations incorporate nonlinear anisotropic elasticity for behavior of single crystals within polycrystalline aggregates, cohesive zone models for intergranular fracture, and contact interactions among fractured interfaces. Boundary conditions considered include uniaxial strain compression, uniaxial stress compression, and shear with varying confinement, all at high loading rates. Results for both materials demonstrate shear-induced dilatation and increasing shear strength with increasing confining pressure. Failure statistics for unconfined loading exhibit a smaller Weibull modulus (corresponding to greater scatter in peak failure strength) in AlON than in SiC, likely a result of lower prescribed cohesive fracture strength and greater elastic anisotropy in the former. In both materials, the predicted Weibull modulus tends to decrease with an increasing number of grains contained in the simulated microstructure.Published by Elsevier Ltd.

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Modeling nonlinear electromechanical behavior of shocked silicon carbide

Cited by 47 publications

References 88 publications

Diffusion of fission products and radiation damage in SiC

Diffusion of fission products and radiation damage in SiC

Thermal shock fracture mechanics analysis of a semi-infinite medium based on the dual-phase-lag heat conduction model

Mesoscale modeling of nonlinear elasticity and fracture in ceramic polycrystals under dynamic shear and compression

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