doi:10.3850/978-981-08-6555-9_159

ABSTRACT

This paper describes the size-effect in micro-machining based on the strain gradient plasticity theory. The size-effect is introduced into a constitutive material model which is implemented into ABAQUS Finite Element (FE) code by the user-defined subroutine VUMAT written in FORTRAN code. The size-effect theory and the implementation of the constitutive material model into the FE analyses are explicitly given in this paper. The predicted cutting forces using the size-effect and the conventional Johnson-Cook constitutive material models have been compared for AISI 4340 steel material. It has been observed that the size-effect model predicts higher forces compared to the conventional model. Both models have been compared with experimentally determined cutting forces in micro-milling.

Keywords: Finite element analysis, Micro-machining, Size-effect, Elasto-plastic constitutive material model.

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