Fully funded Four Year PhD Studentship sponsored by AMRC with Boeing and EPSRC

University of Sheffield

Investigation of the WC-Co/CFRP and diamond/CFRP tribo-systems by thermo-mechanical finite element analysis

Project Description

Previous research in the drilling of CFRP composites in wet and dry conditions and using uncoated and diamond-coated tools has shown significantly higher undersized holes (and machining-induced damage) when drilling with uncoated tools in comparison to diamond-coated tools. While this could be attributed to the increased tool wear using uncoated tools, this was observed for brand new tools and tools near and over acceptable tool life. Since the analysis of these tools revealed that the diameters of the tools used remained above the hole target nominal diameter, it is suspected that the friction between the WC-Co substrate and the composite generates higher heat than between the diamond coating and the composite. 

An immediate effect of this would be the increased heat build-up around the hole edge, which would explain the increased undersized holes generated with uncoated tools. A further investigation and comparison of the WC-Co/CFRP and diamond/CFRP tribo-systems is required to determine the extent of this effect. Similarly, the impact of the cutting parameters, degree of cure of the composite and cutting fluid in the tribo-system needs to be further studied. This impact can be indirect (e.g. by altering the glass transition temperature (Tg) of the resin or preventing the reaching Tg, which would result in a different tool-workpiece friction) or/and direct (e.g. by creating a lubricating film between the tool and the workpiece). However, this is difficult to ascertain by conventional experiments and the computer modelling of such problem could provide fruitful insight on the heat via thermo-mechanical finite element model. This would be one of the major goals of this PhD.

Entry requirements and eligibility

Due to EPSRC residency requirements, this project is open only to UK and EU applicants who have been resident in the UK for at least 3 years immediately preceding the start of the course.

Applicants must have, or expect to get, a good Masters-level degree (e.g. 1st or 2.i MEng degree or MSc with Merit) or an exceptional BEng, in a relevant science or engineering subject such as applied mathematics, statistics, physics, electrical and electronic engineering, systems and control engineering, mechanical engineering, materials science and engineering, or computer science.

Candidates must also be able show that their English language proficiency is at a level which allows them to successfully complete the EngD. All applicants require an English language qualification, typically a GCSE or an IELTS test (a score of 7 or above is required, with a minimum of 6 in each component).

If in doubt about any aspect of Eligibility, please email idc-machining-science@sheffield.ac.uk for clarification.

Investigation of the WC-Co/CFRP and diamond/CFRP tribo-systems by thermo-mechanical finite element analysis

Fully funded Four Year PhD Studentship sponsored by AMRC with Boeing and EPSRC

Partners: University of Sheffield AMRC with Boeing & EPSRC

Start date: 03 September 2018

Duration: 4 years

Applications deadline: 15 December 2017

Please check eligibility requirements before applying.

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Type / Role:

PhD

Location(s):

Northern England