An alternative treatment of phenomenological higher-order strain-gradient plasticity theory

作者：Kuroda Mitsutoshi^*; Tvergaard Viggo

来源：International Journal of Plasticity, 2010, 26(4): 507-515.

DOI：10.1016/j.ijplas.2009.09.001

• Strain-gradient plasticity
• Size effects
• Dislocations
• Constitutive behavior

Phenomenological higher-order strain-gradient plasticity is here presented through a formulation inspired by previous work for strain-gradient crystal plasticity. A physical interpretation of the phenomenological yield condition that involves an effect of second gradient of the equivalent plastic strain is discussed, applying a dislocation theory-based consideration. Then, a differential equation for the equivalent plastic strain-gradient is introduced as an additional governing equation. Its weak form makes it possible to deduce and impose extra boundary conditions for the equivalent plastic strain. A connection between the present treatment and strain-gradient theories based on an extended virtual work principle is discussed. Furthermore, a numerical implementation and analysis of constrained simple shear of a thin strip are presented.

• 出版日期2010-4