Plastic flows and phase transformations in materials under compression in diamond anvil cell: Effect of contact sliding

Feng, Biao; Levitas, Valery I.; Zarechnyy, Oleg M.

doi:10.1063/1.4816050

Cited by 22 publications

(40 citation statements)

References 17 publications

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“…This is true even without torsion (u ¼ 0), which is consistent with results in Ref. 15. In all cases in this paper, torsion leads to the reduction in the sample thickness, as it was expected from simple analytical model.…”

Section: A Weaker High-pressure Phasesupporting

confidence: 80%

“…This work can be considered as generalization of the previous works 13 for simulation of the processes in RDAC when contact sliding is taken into account or generalization of the previous work 15 on modeling of the processes in DAC with contact sliding and friction, for much more complex three dimensional (3D) case of compression and shear in RDAC. Combination of classical isotropic Coulomb friction model with plastic friction model is extended to consider phase concentration-dependent friction stress and to include small elastic slipping.…”

Section: Introductionmentioning

confidence: 99%

“…12,13,15,16,19 The applicability of the perfectly plastic and isotropic model with the yield strength independent of the deformation history is justified in Ref. 20 under monotonous loading for various classes of materials (metals, rocks, powders, etc.)…”

Section: B Materials Modelmentioning

confidence: 99%

“…15 for compression in traditional diamond anvils is that contact shear stresses and displacements are two dimensional vectors rather than scalars.…”

Section: Friction Modelmentioning

confidence: 99%

“…9 That is why finite-element method (FEM) simulations have been developed to study the evolution of all fields, including concentration of high pressure phases, and effects of material parameters on them, as well as to interpret experimental phenomena. 12,13,15,16 It is a nonlinear problem of coupled PTs and mechanics with large plastic deformations and displacements, which leads to nontrivial simulation challenges using FEM, including convergence.…”

Section: Introductionmentioning

confidence: 99%

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Coupled phase transformations and plastic flows under torsion at high pressure in rotational diamond anvil cell: Effect of contact sliding

Feng

Levitas

2013

Journal of Applied Physics

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A three-dimensional large-sliding contact model coupled with strain-induced phase transformations (PTs) and plastic flow in a disk-like sample under torsion at high pressure in rotational diamond anvil cell (RDAC) is formulated and studied. Coulomb and plastic friction are combined and take into account variable parameters due to PT. Results are obtained for weaker, equal-strength, and stronger high pressure phases, and for three values of the kinetic coefficient in a strain-controlled kinetic equation and friction coefficient. All drawbacks typical of problem with cohesion are overcome, including eliminating mesh-dependent shear band and artificial plastic zones. Contact sliding intensifies radial plastic flow, which leads to larger reduction in sample thickness. Larger plastic strain and increased pressure in the central region lead to intensification of PT. However, the effect of the reduction in the friction coefficient on PT kinetics is nonmonotonous. Sliding increases away from the center and with growing rotation and is weakly dependent on the kinetic coefficient. Also, cyclic back and forth torsion is studied and compared to unidirectional torsion. Multiple experimental phenomena, e.g., pressure self-multiplication effect, steps (plateaus) at pressure distribution, flow to the center of a sample, and oscillatory pressure distribution for weaker high-pressure phase, are reproduced and interpreted. Reverse PT in high pressure phase that flowed to the low pressure region is revealed. Possible misinterpretation of experimental PT pressure is found. Obtained results represent essential progress toward understanding of strain-induced PTs under compression and shear in RDAC and may be used for designing experiments for synthesis of new high pressure phases and reduction in PT pressure for known phases, as well as for determination of PT kinetics from experiments. A three-dimensional large-sliding contact model coupled with strain-induced phase transformations (PTs) and plastic flow in a disk-like sample under torsion at high pressure in rotational diamond anvil cell (RDAC) is formulated and studied. Coulomb and plastic friction are combined and take into account variable parameters due to PT. Results are obtained for weaker, equal-strength, and stronger high pressure phases, and for three values of the kinetic coefficient in a strain-controlled kinetic equation and friction coefficient. All drawbacks typical of problem with cohesion are overcome, including eliminating mesh-dependent shear band and artificial plastic zones. Contact sliding intensifies radial plastic flow, which leads to larger reduction in sample thickness. Larger plastic strain and increased pressure in the central region lead to intensification of PT. However, the effect of the reduction in the friction coefficient on PT kinetics is nonmonotonous. Sliding increases away from the center and with growing rotation and is weakly dependent on the kinetic coefficient. Also, cyclic back and forth torsion is studied and compared to unidirectio...

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Section: A Weaker High-pressure Phasesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: B Materials Modelmentioning

confidence: 99%

“…15 for compression in traditional diamond anvils is that contact shear stresses and displacements are two dimensional vectors rather than scalars.…”

Section: Friction Modelmentioning

confidence: 99%