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 400gpa 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.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright Owner
The Authors
Copyright Date
2019
Language
en
File Format
application/pdf
Recommended Citation
Levitas, Valery I.; Kamrani, Mehdi; and Feng, Biao, "Tensorial stress−strain fields and large elastoplasticity as well as friction in diamond anvil cell up to 400 GPa" (2019). Aerospace Engineering Publications. 153.
https://lib.dr.iastate.edu/aere_pubs/153
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.