Δευτέρα, 4 Σεπτεμβρίου 2017

PhD Scholarship announcement: John Anderson Research Award (JARA) at the University of Strathclyde, Glasgow, UK








 
 
 
Funding for excellent named students who have a First Class honours degree or Masters with Distinction (or equivalent) awarded within a relevant cognate discipline, with internal and external
recognition and a proven commitment to the field of study
 
 
 
Provides a maximum of £9k pa for 3 years University funding.
 
The remaining funding can be contributed from Faculty, Departmental/School, or personal budgets
 
(Faculty will co-invest a maximum of 50% of the remainder (ie £15,330)
Applications require a minimum contribution of 15% (£8,650) of the total student funding package
 
(fees + stipend) that can be evidenced as being External support
An international student can cover the 15% themselves but this must be towards tuition fees and not stipend.

 
Allocations will be managed at University level by RKES
 
In addition to assessment of student and research project quality, and alignment with Department/School, Faculty, and University strategy, to allow the levels of overall support to be maximised, prioritisation will also consider the level of external gearing funds being contributed
 
There are a limited number of awards available (around 15) across all University Departments, therefore competition will be very high.
 
The updated estimated costs for studentships are below.
 
Estimated Studentship costs (figures are based on the average annual increase of the past 3 years)
 
Home 3 years
 
 
Fees
Stipend
Total
 
 
£12,902
£44,760
£57,662
 
 
 
 
 
 
 
International 3 years
 
 
 
 
Fees
Stipend
Total
 
 
£57,000*
£44,760
£101,760
 
* Excluding fees for Biome


 

 

RE-COMPOSITE: REpair of COMPOSITE structures using laser powder deposition

Principal Investigator: Prof. Dr. Paul Xirouchakis, University of Strathclyde, DMEM, Glasgow, UK

Email: paul.xirouchakis@strath.ac.uk

 

Background

 

The use of composites in various applications (wind turbines, aerospace, automotive, marine and construction) is steadily growing. These high value structures are subject to considerable wear and degradation during operation and they need maintenance and repair. Current composites structures repair methods use epoxy resins which are not cost effective since they result in long repair time, low joining strength and reduced structural reliability due to brittle resin properties with a need of frequent service repair interventions. The large size of these structures requires time consuming component removal and transport operations precluding in situ repair procedures. The long repair lead time results in long downtime and consequent production stopovers. Current repair methods depend on season and weather conditions for their deployment.

 
Aims & Objectives

To overcome the above limitations a novel laser based repair method will be developed by:

 
1.           Developing a short pulse laser cutting method to remove the damage area, tailor the geometric and surface properties of the repair cavity and prepare the cavity filling patches; Optimizing the process by selecting the appropriate process parameters (pulse energy, feed rate, ablation depth, hatch distance and number of hatch cycles) based on a design of experiments approach.

 
2.           Developing a powder deposition method to join the patches to the prepared cavity area building upon our previous work on laser metal deposition for the repair of oil & gas equipment:

 
a.           Developing correlations between the process parameters (laser power, scan speed, powder flow rate) and the resulting temperature of the powder flow;

 
b.           Developing numerical simulation procedures of the powder flow and the interaction of the deposition particles with the underlying substrate to investigate the influence of the temperature of the powder flow on the viscous flow behavior of the deposited powder; characterize the deposition joint quality: porosity, infiltration depth, tensile strength & elongation and delamination resistance.

 

3.           Developing an access-based laser scan planning for in-situ repair and optimal scarfing ratios. From the damaged area accessibility cone determine the selected tool direction taking into account the size and shape of the tool. Use volumetric reasoning solid modeling methods (Medial Axis Transforms) building upon our previous research (reference no. 1).
 

4.           Developing a control strategy for precise laser cutting and deposition while limiting the extent of the heat input and the Heat Affected Zone (HAZ). Use the Fuzzy Nets approach building upon our previous zero defect manufacturing research (reference no. 2).

 
Expected benefits

 
1.           Increase by 30% the service life of repaired composite structures due to higher reliability repair with reduced heat input and distortion

 
2.           Reduce composite resource downtime by 20% by new access-based in-situ repair process

 
References

 
1.           International patent application: Lazar, M.B.; Stroud, I.A.; Xirouchakis, P.; Goualard, G.; Barras, F. – Medial Axis Transformation as a solid modelling representation method for CAD software, n° PCT/IB2015/057359 September 2015.

 

2.           International Patent Application, 2016: " Zero defect manufacturing process for electric discharge machining": P. Xirouchakis, O. Akten, A. Bufardi, M. Arif, R. Perez.

 

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