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PhD Studentship: Crack behaviour in a residual stress field at fillet welds in ship structures (NSIRC247)

  • Full or part time
    Mr G Wu
  • Application Deadline
    Applications accepted all year round
  • Funded PhD Project (Students Worldwide)
    Funded PhD Project (Students Worldwide)

Project Description

Welding residual stresses are complex in fillet welds used to join longitudinal stiffened plate at the bottom of ship structures that are exposed to complex cyclic loads. The residual stress distributions in stiffeners and plates are seen to be different from those in the as-welded conditions. Residual stress plays a significant role in crack initiation and propagation originated from the toe of fillet welds where stress concentration is high. It is therefore important to investigate the distribution and redistribution residual stresses before and after loading conditions and the effect of residual stresses on crack behaviour.

Project Outline
The proposed research project will provide the opportunity to use an advanced in-situ experimental method (neutron diffraction) and numerical simulation techniques to measure and predict the distributions of residual stresses when cyclic loads are applied to fillet weld joints containing a surface-breaking flaw. The load applied will be in the elastic shakedown region assuming no flaws in the joints. Destructive methods, such as contour method, Deep-hole drilling and centre-hole drilling techniques, may also be used to measure residual stresses in the project. The crack behaviour at the residual stress field will be thoroughly examined experimentally and numerically. Microstructural studies will be also performed to identify the key elements contributing to the crack growth at the residual stress field. It is anticipated that an analytical method can be developed to adequately predict the crack behaviour during the fatigue design life by taking into account the effect of residual stresses at the end of the project. This will assist to design a safe welded structure within the design life by controlling residual stress distribution in the joints. The outcomes will potentially benefit for standards/codes in which the treatment of residual stress in structural integrity assessment is addressed.

About Industrial Sponsor
The Lloyd’s Register Foundation funds the advancement of engineering-related education and research and supports work that enhances the safety of life at sea, on land and in the air, because life matters. Lloyd’s Register Foundation is partly funded by the profits of their trading arm Lloyd’s Register Group Limited, a global engineering, technical and business services organisation.

The National Structural Integrity Research Centre is a state-of-the-art postgraduate engineering facility established and managed by structural integrity specialist TWI. Working closely with top UK and International Universities and a number of leading industrial partners, NSIRC aims to deliver industry led and relevant cutting edge research and highly qualified personnel to its key industrial partners.

About the University
Our research in Materials Engineering and Structural Integrity builds on our historical research strengths at Coventry University and adds new research teams through investment and growth. We develop and apply advanced experimental methods and computational models to study the structural integrity problems, particularly in high-value, safety-critical industries such as aerospace and nuclear power, working with global partners in industry and national laboratories. Our key research themes include advanced modelling and experimentation, mechanics and measurement, non-destructive evaluation, residual stress measurement and stress engineering.

Candidate Requirements
Candidates should have a relevant degree at 2.1 minimum, or an equivalent overseas degree in engineering or materials science. Candidates with suitable work experience and strong capacity in numerical modelling and experimental skills are particularly welcome to apply. Overseas applicants should also submit IELTS results (minimum overall score 7.0) if applicable.

Funding Notes

Funding Notes
This project is funded by Lloyd’s Register Foundation, TWI and academic partners. The studentship will provide successful Home/EU students with a stipend of £16k/year and will cover the cost of tuition fees. Overseas applicants are welcome to apply, with total funding capped at £24k/year.

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