Campus Units

Aerospace Engineering, Mechanical Engineering, Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-2017

Journal or Book Title

Scientific Reports

Volume

7

First Page

45461

DOI

10.1038/srep45461

Abstract

The main principles of producing a region near the center of a sample, compressed in a diamond anvil cell (DAC), with a very high pressure gradient and, consequently, with high pressure are predicted theoretically. The revealed phenomenon of generating extremely high pressure gradient is called the pressure self-focusing effect. Initial analytical predictions utilized generalization of a simplified equilibrium equation. Then, the results are refined using our recent advanced model for elastoplastic material under high pressures in finite element method (FEM) simulations. The main points in producing the pressure self-focusing effect are to use beveled anvils and reach a very thin sample thickness at the center. We find that the superposition of torsion in a rotational DAC (RDAC) offers drastic enhancement of the pressure self-focusing effect and allows one to reach the same pressure under a much lower force and deformation of anvils.

Comments

This article is published as Feng, Biao, and Valery I. Levitas. "Pressure self-focusing effect and novel methods for increasing the maximum pressure in traditional and rotational diamond anvil cells." Scientific Reports 7:45461 (2017). doi: 10.1038/srep45461. Posted with permission.

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Copyright Owner

The Authors

Language

en

File Format

application/pdf

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