BEN's Lab @Northumbria

Extreme Materials and Devices Lab @Northumbria

Fully funded PhD studentship

Mechanics of magnetic shape memory thin films and their applications in future engineering (Adv Ref: RDF18/MCE/CHEN)

Project Description:
Magnetic shape memory alloys can undergo large strain change (6% − 10%) under magneto-mechanical loadings. This large strain change is due to the martensite reorientation or phase transition induced by magnetic field and/or mechanical stresses. Recently, it is found that some polycrystalline magnetic shape memory thin films can be actuated by magnetic field (Adv. Mater., 27, 2015), while others cannot (Acta Mater., 59, 2011). Systematic studies are needed to interpret the different behaviours of magnetic shape memory thin films.

The primary goal of this research is to understand the physical mechanisms coupling the multi-physics behaviours for magnetic shape memory thin films, unveil the relationship between the macroscopic behaviours and the microstructures (magnetic domains, twin microstructures, strain patterns, textures), propose design guidelines for magnetic shape memory thin films, and explore their potential applications in future micro-electro-mechanical systems. The objectives to achieve the primary goal are to:

• develop multi-scale models from microstructural evolutions to macroscopic behaviours for magnetic shape memory thin films;
• validate models by experiments and derive from model simulations the criteria/guidelines for controlling/improving the magneto-mechanical coupling behaviours of magnetic shape memory thin films;
• design, simulate and optimize micro devices of magnetic shape memory thin films that can be used as actuators, sensors, energy harvesters or magneto-caloric cooling elements in future micro-electro-mechanical systems.

Eligibility and How to Apply:
Please note eligibility requirement:
• Academic excellence of the proposed student i.e. 2:1 (or equivalent GPA from non-UK universities [preference for 1st class honours]); or a Masters (preference for Merit or above); or APEL evidence of substantial practitioner achievement.
• Appropriate IELTS score, if required.
• Applicants cannot apply for this funding if currently engaged in Doctoral study at Northumbria or elsewhere.

For further details of how to apply, entry requirements and the application form, see:
https://www.northumbria.ac.uk/research/postgraduate-research-degrees/how-to-apply/

Please note: Applications that do not include a research proposal of approximately 1,000 words (not a copy of the advert), or that do not include the advert reference (e.g. RDF18/…) will not be considered.

Deadline for applications: 28 January 2018

Start Date: 1 October 2018

Northumbria University takes pride in, and values, the quality and diversity of our staff. We welcome applications from all members of the community. The University holds an Athena SWAN Bronze award in recognition of our commitment to improving employment practices for the advancement of gender equality and is a member of the Euraxess network, which delivers information and support to professional researchers.
Funding Notes
The studentship includes a full stipend, paid for three years at RCUK rates (for 2017/18, this is £14,553 pa) and fees.

References:
Magnetic shape memory alloys
• Chen, X., Moumni, Z., He, Y. J., Zhang, W, 2014. A three-dimensional model of magneto-mechanical behaviors of martensite reorientation in ferromagnetic shape memory alloys. Journal of the Mechanics and Physics of Solids 64, 249–286. (Impact factor = 4.255, 11st out of 387 in Mechanics of Materials, Q1, top 10%)
• Chen, X., He, Y. J., Moumni, Z., 2013. Twin boundary motion in NiMnGa single crystals under biaxial compression. Materials Letters 90, 72–75. (Impact factor = 2.426, 113rd out of 689 in Mechanical engineering, Q1)

Micro-electro-mechanical systems
• Chen, X., Meguid, S. A., 2017. Nonlinear vibration analysis of a microbeam subject to electrostatic force. Acta Mechanica 228, 1343–1361. (Impact factor = 1.85, 91st out of 689 in Mechanical engineering, Q1)
• Chen, X., Meguid, S. A., 2016. Asymmetric bifurcation of thermally and electrically actuated functionally graded material microbeam. Proceedings of the Royal Society of London A 472, 20150597. (Impact factor = 2.146, 52nd out of 518 in Engineering (miscellaneous), Q1, top 10%)
• Chen, X., Meguid, S. A., 2015. Asymmetric bifurcation of initially curved nanobeam. ASME Journal of Applied Mechanics 82, 091003. (Impact factor = 2.133, 95th out of 689 in Mechanical engineering, Q1)
• Chen, X., Meguid, S. A., 2015. On the parameters which govern the symmetric snap-through buckling behavior of an initially curved microbeam. International Journal of Solids and Structures 66, 77–87. (Impact factor = 2.76, 35th out of 689 in Mechanical engineering, Q1, top 10%)
• Chen, X., Meguid, S. A., 2015. Snap-through buckling of initially curved microbeam subject to an electrostatic force. Proceedings of the Royal Society of London A 471, 20150072. (Impact factor = 2.146, 52nd out of 518 in Engineering (miscellaneous), Q1, top 10%)

If you have any queries, please directly contact
Sherry