Quasi-static response and texture evolution of α- and γ-RDX: a comparative study

Josyula, Kartik; Rahul, *; De, Suvranu

doi:10.1080/14786435.2016.1178404

Cited by 3 publications

(3 citation statements)

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“…Furthermore, De et al (2014) compare their simulation results with experimental data reported by that was superseded by data published in an erratum by Hooks et al (2011). Josyula et al (2016) applied a variation on the model developed by De et al (2014) to simulate quasistatic compression. Whereas Josyula et al (2016) emphasize the importance of representing dislocation behavior, they omit some of the dislocation-inspired phenomenology of De et al (2014) instead employing a power-law viscoplastic slip rate.…”

Section: Introductionmentioning

confidence: 99%

“…Josyula et al (2016) applied a variation on the model developed by De et al (2014) to simulate quasistatic compression. Whereas Josyula et al (2016) emphasize the importance of representing dislocation behavior, they omit some of the dislocation-inspired phenomenology of De et al (2014) instead employing a power-law viscoplastic slip rate. While the modified model includes four additional slip systems not included by De et al (2014), the results exhibit purely elastic response for compression on (100) planes because the considered slip systems have zero Schmid factor for that orientation.…”

Section: Introductionmentioning

confidence: 99%

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A dislocation density-based continuum model of the anisotropic shock response of single crystal α-cyclotrimethylene trinitramine

Luscher

Addessio

Cawkwell

et al. 2017

Journal of the Mechanics and Physics of Solids

103

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We have developed a model for the finite deformation thermomechanical response of α-cyclotrimethylene trinitramine (RDX). Our model accounts for nonlinear thermoelastic lattice deformation through a free energy-based equation of state developed by Cawkwell et al. (2016) in combination with temperature and pressure dependent elastic constants, as well as dislocation-mediated plastic slip on a set of slip systems motivated by experimental observation. The kinetics of crystal plasticity are modeled using the Orowan equation relating slip rate to dislocation density and the dislocation velocity developed by Austin and McDowell (2011), which naturally accounts for transition from thermally-activated to dislocation drag limited regimes. Evolution of dislocation density is specified in terms of local ordinary differential equations reflecting dislocation-dislocation interactions. The paper presents details of the theory and parameterization of the model, followed by discussion of simulations of flyer plate impact experiments. Impact conditions explored within this combined simulation and experimental effort span shock pressures ranging from 1 to 3 GPa for four crystallographic orientations and multiple specimen thicknesses. Simulation results generated using this model are shown to be in strong agreement with velocimetry measurements from the corresponding plate impact experiments. Finally, simulation results are used to motivate conclusions about the nature of dislocation-mediated plasticity in RDX.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A dislocation density-based continuum model of the anisotropic shock response of single crystal α-cyclotrimethylene trinitramine

Luscher

Addessio

Cawkwell

et al. 2017

Journal of the Mechanics and Physics of Solids

103

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show abstract

“…While anisotropic elastic-plastic response of both the α-RDX (Clayton and Becker, 2012;LaBarbera and Zikry, 2013;De et al, 2014) and the γ-RDX (Josyula et al, 2016) has been studied, continuum modeling of α-γ phase transition that accounts for crystal orientation, defect evolution, and high strain rate effects has not been undertaken.…”

Section: Introductionmentioning

confidence: 99%

A phase-field model for shock-induced α-γ phase transition of RDX

Rahul

2017

International Journal of Plasticity

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A thermodynamically consistent continuum phase-field model has been developed to investigate the role of shock-induced solid-solid phase transformation in the deformation mechanisms of molecular single crystals. The effects of microstructural evolution and phase transformation are distinguished and modeled within a crystal plasticity framework that is developed for single crystals at high strain rate. When applied to 1,3,5trinitroperhydro-1,3,5-triazine (RDX) single crystal, the model predicts α-γ phase transition within the experimentally observed range of shock stresses. Phase-field simulations suggest that the α-γ phase transition requires finite time to occur, where plasticity tends to delay the transition. Phase transformation is associated with stress relaxation, and increased temperature rise and associated shock-sensitivity. The shock response of α-γ phase transition is orientation dependent.

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Eulerian finite element simulations of the drop weight impact test with a dislocation Density-based continuum model

Zecevic,

Cawkwell,

Cheng

et al. 2023

AIP Conference Proceedings

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Quasi-static response and texture evolution of α- and γ-RDX: a comparative study

Cited by 3 publications

References 35 publications

A dislocation density-based continuum model of the anisotropic shock response of single crystal α-cyclotrimethylene trinitramine

A dislocation density-based continuum model of the anisotropic shock response of single crystal α-cyclotrimethylene trinitramine

A phase-field model for shock-induced α-γ phase transition of RDX

Eulerian finite element simulations of the drop weight impact test with a dislocation Density-based continuum model

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