Back stress strengthening and strain hardening in gradient structure
Chinese Academy of Sciences · Institute of Mechanics · +4 more institutions
Abstract
We report significant back stress strengthening and strain hardening in gradient structured (GS) interstitial-free (IF) steel. Back stress is long-range stress caused by the pileup of geometrically necessary dislocations (GNDs). A simple equation and a procedure are developed to calculate back stress basing on its formation physics from the tensile unloading-reloading hysteresis loop. The gradient structure has mechanical incompatibility due to its grain size gradient. This induces strain gradient, which needs to be accommodated by GNDs. Back stress not only raises the yield strength but also significantly enhances strain hardening to increase the ductility. [GRAPHICS] .
Citation impact
- FWCI
- 23.70
- Percentile
- 100%
- References
- 37
Authors
5- MYMuxin Yang
Chinese Academy of Sciences, Institute of Mechanics, State Key Laboratory of Nonlinear Mechanics
- YPYue Pan
Tongji University, Chinese Academy of Sciences, Institute of Mechanics, State Key Laboratory of Nonlinear Mechanics
- FYFuping Yuan
Chinese Academy of Sciences, Institute of Mechanics, State Key Laboratory of Nonlinear Mechanics
- YZYuntian Zhu
North Carolina State University, Nanjing University of Science and Technology
- XWXiaolei WuCorresponding
Chinese Academy of Sciences, Institute of Mechanics, State Key Laboratory of Nonlinear Mechanics
Topics & keywords
- Materials science
- Strain hardening exponent
- Hardening (computing)
- Ultimate tensile strength
- Composite material
- Ductility (Earth science)
- Stress (linguistics)
- Creep