Campus Units

Aerospace Engineering, Mechanical Engineering, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

10-1-2019

Journal or Book Title

npj Computational Materials

Volume

5

First Page

94

DOI

10.1038/s41524-019-0234-8

Abstract

Various phenomena (fracture, phase transformations, and chemical reactions) studied under extreme pressures in diamond anvil cell are strongly affected by fields of all components of stress and plastic strain tensors. However, they could not be measured. Here, we suggest a coupled experimental−theoretical−computational approach that allowed us (using published experimental data) to refine, calibrate, and verify models for elastoplastic behavior and contact friction for tungsten (W) and diamond up to 400 GPa and reconstruct fields of all components of stress and large plastic strain tensors in W and diamond. Despite the generally accepted strain-induced anisotropy, strain hardening, and path-dependent plasticity, here we showed that W after large plastic strains behaves as isotropic and perfectly plastic with path-independent surface of perfect plasticity. Moreover, scale-independence of elastoplastic properties is found even for such large field gradients. Obtained results open opportunities for quantitative extreme stress science and reaching record high pressures.

Comments

This article is published as Levitas, Valery I., Mehdi Kamrani, and Biao Feng. "Tensorial stress−strain fields and large elastoplasticity as well as friction in diamond anvil cell up to 400 GPa." npj Computational Materials 5, no. 1 (2019). DOI: 10.1038/s41524-019-0234-8. 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

Share

COinS