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Advanced modelling for the orthogonal cutting of unidirectional carbon fibre reinforced plastic composites

Abena, Alessandro (2018)
Ph.D. thesis, University of Birmingham.

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Abstract

This thesis provides new methodologies to improve the simulation of the orthogonal cutting of unidirectional carbon fibre reinforced plastic (UD-CFRP) composites. In a meso-scale approach, a new cohesive model was developed to overcome the excessive deformations shown by the generally implemented zero thickness cohesive elements. The smoothed particle hydrodynamics (SPH) approach was implemented to avoid element deletion during the analysis, taking place in the commonly used finite element method (FEM). The SPH enabled better prediction of the thrust force, more realistic chip formation mechanisms and the capability to simulate the bouncing back. However, the absence of a cohesive layer did not permit the collection of information on the interface behaviour. Therefore, a hybrid model, based on the FEM to SPH conversion, was deployed to introduce a cohesive layer, while avoiding element deletion. In-house experiments were conducted for validating the hybrid model. The hybrid approach consented implementation of the novel cohesive model while improving the thrust force prediction when compared with the FEM. It was able to capture the effect of a round cutting edge, as was highlighted in the experimental results. Experiments highlighted the strong influence of the rake angle and fibre orientation on the bouncing back.

Type of Work:Ph.D. thesis.
Supervisor(s):Essa, Khamis
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:7941
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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