Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 727, Issue -, Pages 113-118Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.04.107
Keywords
Laminate; Back stress; Strain hardening; Elastic/plastic interaction; Nanostructure
Categories
Funding
- National Natural Science Foundation of China [11672195, 51601204]
- Sichuan Youth Science and Technology Foundation [2016JQ0047]
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The effect of back stress on the mechanical behaviors of heterogeneous material is studied in two modeled heterogeneous laminates, i.e. laminated structure with a nanostructured (NS) Cu-Zn alloy layer sandwiched between two coarse-grained (CG) pure Cu layers. The improved tensile ductility of NS layer is revealed and attributed to the constraint from the stable CG layers. It is found that the elastic/plastic interaction between NS and CG layers is capable of significantly improving the back stress, which makes a significant contribution to the synergetic strain hardening in low strain stage. Furthermore, a higher mechanical incompatibility permits stronger and longer mutual interaction between layers, i.e. coupling effect, which contributes to a higher back stress. These results improve our understanding about the role of back stress on mechanical behaviors of heterogeneous laminate materials.
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