Continuum modeling of localized deformation in irradiated bcc materials

Patra, Anirban; McDowell, David L.

doi:10.1016/j.jnucmat.2012.08.021

Cited by 57 publications

(48 citation statements)

References 78 publications

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“…Vacancy pipe diffusion coefficient of irradiated and virgin smooth specimens for different loading and temperature histories are not presented here to avoid repetition with Patra and McDowell (2013). Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(T1.9)), in which the rate of annihilation of interstitial loops depends on interstitial loops and mobile dislocations interacting within a critical capture radius. See Patra and McDowell (2013) for a detailed description of the interstitial loop annihilation model. Other forms of flow localization models for irradiated fcc and bcc metals are given in Arsenlis et al (2004), Barton et al (2013), Krishna et al (2010).…”

Section: Constitutive Equation Notesmentioning

confidence: 99%

“…(T1.9)) were estimated such that the simulated engineering stress just beyond the point of material softening and up to E4% applied strain matches the experimental values (cf. Patra and McDowell (2013)). It is of course noted that this may not be the only unique set of parameters for the crystal plasticity model.…”

Section: Model Parametersmentioning

confidence: 99%

“…A phenomenological material softening rule was constituted to account for the reduction in density of the irradiation-induced defects along favored crystallographic planes, leading to the formation of dislocation channels (Patra and McDowell, 2013). This framework was used to model localized deformation along dislocation channels in bcc materials.…”

Section: Introductionmentioning

confidence: 99%

“…This framework was used to model localized deformation along dislocation channels in bcc materials. Based on finite element (FE) simulations of irradiated polycrystalline ensembles (Patra and McDowell, 2013), it was concluded that channel formation and associated flow localization is greatly influenced by intergranular heterogeneity combined with 'constitutive' material softening.…”

Section: Introductionmentioning

confidence: 99%

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A void nucleation and growth based damage framework to model failure initiation ahead of a sharp notch in irradiated bcc materials

Patra

2015

Journal of the Mechanics and Physics of Solids

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a b s t r a c tA continuum damage framework is developed and coupled with an existing crystal plasticity framework, to model failure initiation in irradiated bcc polycrystalline materials at intermediate temperatures. Constitutive equations for vacancy generation due to inelastic deformation, void nucleation due to vacancy condensation, and diffusion-assisted void growth are developed. The framework is used to simulate failure initiation at dislocation channel interfaces and grain boundaries ahead of a sharp notch. Evolution of the microstructure is considered in terms of the evolution of inelastic deformation, vacancy concentration, and void number density and radius. Evolution of the damage, i.e., volume fraction of the voids, is studied as a function of applied deformation. Effects of strain rate and temperature on failure initiation are also studied. The framework is used to compute the fracture toughness of irradiated specimens for various loading histories and notch geometries. Crack growth resistance of the irradiated specimens are computed and compared to that of virgin specimens. Results are compared to available experimental data.

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Section: Resultsmentioning

confidence: 99%