STRAIN GRADIENT PLASTICITY - THEORY AND EXPERIMENT

被引：3238

作者：

FLECK, NA ^{[1
]}

MULLER, GM ^{[1
]}

ASHBY, MF ^{[1
]}

HUTCHINSON, JW ^{[1
]}

机构：

[1] HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA

来源：

ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 02期

关键词：

D O I：

10.1016/0956-7151(94)90502-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dislocation theory is used to invoke a strain gradient theory of rate independent plasticity. Hardening is assumed to result from the accumulation of both randomly stored and geometrically necessary dislocations. The density of the geometrically necessary dislocations scales with the gradient of plastic strain. A deformation theory of plasticity is introduced to represent in a phenomenological manner the relative roles of strain hardening and strain gradient hardening. The theory is a nonlinear generalization of Cosserat couple stress theory. Tension and torsion experiments on thin copper wires confirm the presence of strain gradient hardening. The experiments are interpreted in the light of the new theory.

引用

页码：475 / 487

页数：13

共 27 条

[11] CONSTITUTIVE ANALYSIS OF ELASTIC-PLASTIC CRYSTALS AT ARBITRARY STRAIN [J].