On elastic and plastic length scales in strain gradient plasticity

Jinxing Liu, Wen Wang, Ziyu Zhao, Ai Kah Soh

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)


The Fleck-Hutchinson theory on strain gradient plasticity (SGP), proposed in Adv. Appl Mech 33 (1997) 295, has recently been reformulated by adopting the strategy of decomposing the second order strain presented by Lam et al. in J Mech Pays Solids 51 (2003) 1477. The newly built SGP satisfies the non negativity of plastic dissipation, which is still an outstanding issue in other SGP theories. Furthermore, it explicitly shows how elastic strain gradients and corresponding elastic characteristic length scales come into play in general elastic-plastic loading histories. In this study, the relation between elastic length scales and plastic length scales is investigated by taking wire torsion as an example. It is concluded that the size effects arising when two sets of length scales are of the same order are essentially elastic instead of plastic.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalStructural Engineering and Mechanics
Issue number2
Publication statusPublished - 25 Jan 2017


  • Length scale
  • Plastic dissipation
  • Size effect
  • Strain gradient elasticity (SGE)
  • Strain gradient plasticity (SGP)

Cite this