15th CIRP Conference on Modelling of Machining Operations An elastoplastic constitutive damage model to simulate the chip formation process and workpiece subsurface defects when machining CFRP

The machining process of multi-layer composites made of Carbon Fiber Reinforced Polymer(CFRP) generates mainly four damage mod es in the workpiece: matrix cracking, debonding at the fiber-matrix interface, fiber rupture and interlaminar delamination. The damage modes mentioned above have been predicted through a user routine "VUMAT", which provides the ability to implement, in Abaqus/Explic it, a combined elastoplastic damage behavior law for progressive failure. The proposed approach is primarily focused on the understanding of interactions between the fiber orientation and the physical phenomena governing the chip formationand the induced damage process. © 2015 The Authors. Published by Elsevier B.V. Peer-review under responsibility of The International Scientific Committee of the “15th Conference on Modelling of Machining Operations”.