Study of the machining induced damage in UD-CFRP laminates with various fibre orientations:FE assessment

摘要

Finite elements(FE)provide an excellent and low-cost approach in the assessment of composite machining induced damage.This article is focused on the evaluation of the damage underlying the machined surface through the development of a novel 3D FE model in composite machining.Sub-surface damage of UD-CFRP with fibre orientations from 0° to 90° is evaluated.An algorithm to assess composite damage evolution and chip formation is inserted via user-defined subroutine.Damage initiation is determined using Hashin's failure criteria for fibre damage modes,while matrix damage modes are assessed via Puck's failure criteria.Subsequent damage evolution is modelled using an energy-based linear damage degradation law.Numerical results reveal relevant advances in the prediction of the damage induced underlying the machined surface for fibre orientations from 60° to 90° obtained in previous investigations.