Abstract
A mechanism-based theory of strain gradient plasticity (MSG) is proposed based on a multiscale framework linking the microscale notion of statistically stored and geometrically necessary dislocations to the mesoscale notion of plastic strain and strain gradient. This theory is motivated by the analysis of indentation experiments which strongly suggest a linear dependence of the square of plastic flow stress on strain gradient. It is believed that a mesoscale theory of plasticity should not only be based on stress-strain behavior obtained from macroscopic mechanical tests, but should also draw information from micromechanical, gradient-dominant tests.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1239-1263 |
| Number of pages | 25 |
| Journal | Journal of the Mechanics and Physics of Solids |
| Volume | 47 |
| Issue number | 6 |
| DOIs | |
| State | Published - Apr 14 1999 |
Funding
The work of H.G. was supported by the NSF through Young Investigator Award MSS-9358093. The work of Y.H. was supported by the NSF through Grants INT-9423964 and CMS-96-10491, and by the NSF of China. The work of W.D.N. was supported by the DOE through Grant DE-FG03-89ER45387. The work of J.W.H. was supported in part by the ONR through Grant N00014-96-10059 and by the NSF through Grant CMS-96-34632. H.G. and Y.H. acknowledge helpful discussions with Keh-Chih Hwang.
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering