Affordable Access

Publisher Website

A strain-gradient plasticity theory of bimodal nanocrystalline materials with composite structure

Authors
Journal
Composites Part B Engineering
1359-8368
Publisher
Elsevier
Volume
43
Issue
2
Identifiers
DOI: 10.1016/j.compositesb.2011.11.048
Keywords
  • A. Nano-Structures
  • B. Mechanical Properties
  • C. Analytical Modelling
Disciplines
  • Mathematics

Abstract

Abstract For the purpose of evaluating the mechanical property of bimodal nanocrystalline (nc) materials, a new composite constitutive model comprised of coarse grains evenly distributed in the nc matrix with respect to strain gradient has been developed. Due to their dissimilar properties and mismatch between the two phases, dislocation-controlling mechanism based on the statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs) was analyzed and extended to consider the different influences of two parts in the composite model. We firstly built a stress–strain relation for strain gradient plasticity to predict the effect of grain size distribution on the flow stress. To describe the strain strength quantitatively, a strain-hardened law determined from strain gradient and a nanostructure characteristic length parameter were developed. The strain-hardened law and nanostructure characteristic length parameter were not the same as described in classical strain gradient theory.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Strain gradient plasticity: Theory and experiment

on Acta Metallurgica et Materiali... Jan 01, 1994

A strain gradient theory of plasticity

on International Journal of Solid... Jan 01, 1970

A theory of strain-gradient plasticity for isotrop...

on International Journal of Plast... Jan 01, 2005
More articles like this..