A NONLOCAL MODEL FOR SIZE EFFECT AND LOCALIZATION IN PLASTICITY

Authors

  • C. COMI
  • L. DRIEMEIER

Keywords:

Abstract

A SIMPLE NONLOCAL PLASTICITY MODEL IS PROPOSED TO ACCOUNT FOR THE SIZE DEPENDENCE OF PLASTIC DEFORMATION AT THE MICRO-SCALE AND AT THE SAME TIME TO REGULARIZE THE RESPONSE IN THE PRESENCE OF LOCALIZATION PHENOMENA. NONLOCALITY IS INTRODUCED IN THE YIELD FUNCTION THROUGH THE DEFINITION OF A NONLOCAL STRAIN, WHICH IS THE WEIGHTED AVERAGE OF THE LOCAL STRAIN OVER A SUITABLE NEIGHBORHOOD, DEPENDING ON THE MATERIAL LENGTH. WE APPLY THE MODEL TO A STRAIN LOCALIZATION PROBLEM OF A SOFTENING BAR AND WE COMPARE MODEL PREDICTIONS WITH EXPERIMENTS ON MICROBENDING AND MICROTORSION.

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Published

2005-06-01

Issue

Vol. 2 No. 2 (2005)

Section

Articles

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