The coupled effects of plastic strain gradient and thermal softening on the dynamic growth of voids

Xiaoyi Wu, K. T. Ramesh, T. W. Wright

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This paper examines the combined effects of temperature, strain gradient and inertia on the growth of voids in ductile fracture. A dislocation-based gradient plasticity theory [J. Mech. Phys. Solids 47 (1999) 1239, J. Mech. Phys. Solids 48 (2000) 99] is applied, and temperature effects are incorporated. Since a strong size-dependence is introduced into the dynamic growth of voids through gradient plasticity, a cut-off size is then set by the stress level of the applied loading. Only those voids that are initially larger than the cut-off size can grow rapidly. At the early stages of void growth, the effects of strain gradients greatly increase the stress level. Therefore, thermal softening has a strong effect in lowering the threshold stress for the unstable growth of voids. Once the voids start rapid growth, however, the influence of strain gradients will decrease, and the rate of dynamic void growth predicted by strain gradient plasticity approaches that predicted by classical plasticity theories.

Original languageEnglish (US)
Pages (from-to)6633-6651
Number of pages19
JournalInternational Journal of Solids and Structures
Volume40
Issue number24
DOIs
StatePublished - Dec 2003
Externally publishedYes

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Strain Gradient
Softening
Voids
softening
voids
Plastics
Plastic deformation
plastics
gradients
Gradient Plasticity
Plasticity
plastic properties
cut-off
Ductile fracture
Ductile Fracture
Temperature Effect
Thermal effects
Hot Temperature
Dislocation
inertia

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

The coupled effects of plastic strain gradient and thermal softening on the dynamic growth of voids. / Wu, Xiaoyi; Ramesh, K. T.; Wright, T. W.

In: International Journal of Solids and Structures, Vol. 40, No. 24, 12.2003, p. 6633-6651.

Research output: Contribution to journalArticle

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