Investigate sub surface damage and its impact on structural dynamic behaviour PhD Self-funded PhD opportunity

The research in this doctoral opportunity will analytically and numerically model the changes in modal responses of a structure under thermo-mechanical loads.

Sub-surface fatigue in mechanical structures affects their fundamental modes within conventional sensing limits. As per published research, these effects are mostly investigated under dynamic loads on different boundary conditions. Analytical, numerical and empirical studies clearly indicate that the dissipated strain energy during crack propagation affects the modal values of the structure. However, there is still need to perform comprehensive research that can relate the mentioned parameters specifically under thermo-mechanical loads. The cyclic thermal loads along with dynamic loading may represent a more practical loading scheme as experienced on mechanical components or structures.

In this research, analytical and numerical modelling will be performed on a structure with different boundary conditions. The structure will be loaded at resonance with a cyclic thermal load applied at the ends. The changes in the modal responses of the structure will be determined during the subsurface crack initiation and propagation. The results will then be compared with the available empirical studies in the literature.

The Through-life Engineering Services (TES) Centre at Cranfield University is among the world leaders in through-life approaches for high value systems, including condition monitoring, damage tolerance, and asset management. TES was developed with the support of an EPSRC grant of £11 million and provides academic and research services to industrial clients such as Boeing, BAE Systems, Rolls-Royce, Meggitt, Thales, MOD, Bombardier, QinetiQ, Network Rail, Schlumberger and Alstom.

Entry Requirements:
- A minimum of a 2:1 first degree in a relevant discipline (e.g. aerospace, automotive, mechanical, and manufacturing) with a minimum 60% mark in the Project element or equivalent with a minimum 60% overall module average
- The potential to engage in innovative research and to complete the PhD within a three-year period of study
- A minimum English language proficiency (IELTS overall minimum score of 6.5)
- Excellent analytical, reporting and communication skills
- Self-motivated, independent and a team player
- Genuine enthusiasm for the subject and technology
- Willingness to publish research findings in international journals

Research students at Cranfield benefit from being part of the Cranfield Doctoral Network, which brings together research students and staff to share ideas, identify collaboration opportunities, and create communities of practice. Students are also expected to attend the Doctoral Researchers' Core Development (DRCD) Programme, comprising four 1-week units covering the key stages of the research journey.

Supervisors: Dr Muhammad Khan and Professor Andrew Starr

Funding: Self-funded