EngD - Variable Amplitude Corrosion Fatigue of Offshore Wind Steel Foundation Structures

Renewable Energy Marine Structures

This project proposes to study the interaction between wind induced machine loading and wind/wave (environmental) loading acting on the support structure. Currently researchers and designers do not know if or when peak machine loads coincide with environmental loads and how these might interact. Fatigue and corrosion assisted fatigue damage is a local phenomenon and is driven by the interaction between residual and applied stresses locally. This means that machine loading may be contributing to peak stresses in certain parts of the structure and environmental loading contributing to stresses elsewhere. There will be inevitably circumstances where stresses from all sources combine and result in fatigue damage however, the degree to which this might happen and affects on damage need to be researched and better understood.

The EngD project will investigate temporal and spectral approaches to combining machine and wind loading induced fatigue stresses and to determine the sensitivity or otherwise of each approach to fatigue damage. It will also research and develop a "typical" or "standardised" loading sequence/spectrum so that fundamental corrosion fatigue damage mechanisms can be investigated at different laboratories without results being deemed as laboratory specific or machine (wind turbine) specific and conduct variable amplitude fatigue tests on crack propagation specimens under simulated service conditions to better understand the effects of load and frequency characteristics on crack propagation behaviour. This EngD would suit candidates with a background in mechanical, materials or structural engineering.

This is an EngD project within the Renewable Energy Marine Structures (REMS) Centre for Doctoral training (CDT). REMS is an EPSRC funded Centre for Doctoral Training set up to train fifty Engineering Doctorate and PhD students over an eight-year period. Interested applicants should send an up-to-date CV to Dr Ali Mehmanparast (a.mehmanparast@cranfield.ac.uk). The candidate will need to meet the academic requirements for enrolment for the EngD degree at Cranfield University; an upper second or first (or equivalent) in mechanical engineering or related discipline. Student eligibility criteria for EPSRC funding require a relevant connection with the UK, usually established by residence. EU students may be eligible for a fees-only award (i.e. no maintenance grant).

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Type / Role:

PhD

Location(s):

Midlands of England