Mechanism-based strain gradient (MSG) plasticity and the associated asymptotic crack-tip fields

K. C. Hwang*, Y. Huang

*Corresponding author for this work

Research output: Contribution to journalConference article

Abstract

The materials display strong size effect at the micron or sub-micron scale. The classical plasticity theories cannot explain this size dependence because they possess no internal material lengths. Based on the Taylor model in dislocation mechanics, the theory of Mechanism-based Strain Gradient (MSG) plasticity has been derived. It agrees very well with the available micro-scale experiments, such as micro-torsion, micro-bending and micro-indentation hardness experiments. The structure of the asymptotic crack tip fields associated with MSG plasticity is investigated. It is shown that the crack tip field associated with MSG plasticity does not have separable form of solutions. Its implication on the fracture criterion in MSG plasticity is also discussed.

Original languageEnglish (US)
Pages (from-to)I/-
JournalKey Engineering Materials
Volume183
StatePublished - Jan 1 2000
Event4th International Conference on Fracture and Strength of Solids - Pohang, South Korea
Duration: Aug 16 2000Aug 18 2000

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Crack tips
Plasticity
Bending (deformation)
Indentation
Torsional stress
Mechanics
Experiments
Hardness

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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Mechanism-based strain gradient (MSG) plasticity and the associated asymptotic crack-tip fields. / Hwang, K. C.; Huang, Y.

In: Key Engineering Materials, Vol. 183, 01.01.2000, p. I/-.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Mechanism-based strain gradient (MSG) plasticity and the associated asymptotic crack-tip fields

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AU - Huang, Y.

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N2 - The materials display strong size effect at the micron or sub-micron scale. The classical plasticity theories cannot explain this size dependence because they possess no internal material lengths. Based on the Taylor model in dislocation mechanics, the theory of Mechanism-based Strain Gradient (MSG) plasticity has been derived. It agrees very well with the available micro-scale experiments, such as micro-torsion, micro-bending and micro-indentation hardness experiments. The structure of the asymptotic crack tip fields associated with MSG plasticity is investigated. It is shown that the crack tip field associated with MSG plasticity does not have separable form of solutions. Its implication on the fracture criterion in MSG plasticity is also discussed.

AB - The materials display strong size effect at the micron or sub-micron scale. The classical plasticity theories cannot explain this size dependence because they possess no internal material lengths. Based on the Taylor model in dislocation mechanics, the theory of Mechanism-based Strain Gradient (MSG) plasticity has been derived. It agrees very well with the available micro-scale experiments, such as micro-torsion, micro-bending and micro-indentation hardness experiments. The structure of the asymptotic crack tip fields associated with MSG plasticity is investigated. It is shown that the crack tip field associated with MSG plasticity does not have separable form of solutions. Its implication on the fracture criterion in MSG plasticity is also discussed.

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