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Computational modelling of deformation and failure in additively manufactured high strength alloys


School of Engineering

About the Project

Conventional manufacturing processes involve high cost and lead times because of design and manufacturing of product specific tooling for new materials and parts. Additive manufacturing removes the specific tooling requirement and can produce near net-shape components.

The proposed work is a part of the bigger project whose aim is to develop a physics based multiscale computational framework which accounts for real life physical mechanisms. Aim is to develop a computational model which can directly take actual microstructural data from experiments and predict the microstructure evolution along with deformation, damage nucleation and propagation in such materials during manufacturing and in-service.

Recent studies [1–3] have shown that high strength aerospace alloys show extensive twinning and lattice rotation during deformation while some of the alloys show deformation induced phase transformation causing a change in deformation behaviour.
Things get more complicated once damage starts to nucleate and start to form microvoids, and cracks. The evolution of these defects and foreign particles changes the evolution of phase transformation and vice versa.

Therefore, it is necessary to develop a realistic multiscale computational framework which can take into account the actual microstructural data from experiments and predict the microstructure evolution along with damage nucleation and propagation in such materials during metal forming process.

This PhD work will be aimed at developing a multiscale computational framework to account for the effect of damage nucleation and evolution on phase transformation and transformation induced plasticity and vice versa during metal forming processes.

Candidates should have (or expect to achieve) the UK honours degree at 2.1 or above (or equivalent) in Mechanical or Civil Engineering. It is essential that the applicant has an Engineering or Applied physics background with knowledge of CAD and FE based modelling along with knowledge ofMetal additive manufacturing processes, Material Characterisation, Computational Mechanics, Crystal Plasticity.

APPLICATION PROCEDURE:

• Apply for Degree of Doctor of Philosophy in Engineering
• State name of the lead supervisor as the Name of Proposed Supervisor
• State ‘Self-funded’ as Intended Source of Funding
• State the exact project title on the application form

When applying please ensure all required documents are attached:

• All degree certificates and transcripts (Undergraduate AND Postgraduate MSc-officially translated into English where necessary)
• Detailed CV

Informal inquiries can be made to Dr A Siddiq (), with a copy of your curriculum vitae and cover letter. All general enquiries should be directed to the Postgraduate Research School ()

It is possible to undertake this project by distance learning. Interested parties should contact Dr Siddiq to discuss this.

Funding Notes

This project is advertised in relation to the research areas of the discipline of Mechanical Engineering. The successful applicant will be expected to provide the funding for Tuition fees, living expenses and maintenance. Details of the cost of study can be found by visiting View Website. THERE IS NO FUNDING ATTACHED TO THIS PROJECT

References

1. Siddiq A. A porous crystal plasticity constitutive model for ductile deformation and failure in porous single crystals. Int. J. Damage Mech. 2019;28:233–48.

2. Asim UB, Siddiq MA, Kartal M. A CPFEM based study to understand the void growth in high strength dual-phase Titanium alloy (Ti-10V-2Fe-3Al). Int. J. Plast. 2019;122:188–211.

3. Asim U Bin, Siddiq MA, Kartal ME. Representative volume element (RVE) based crystal plasticity study of void growth on phase boundary in titanium alloys. Comput. Mater. Sci. Elsevier; 2019;161:346–50.


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