1. School of Engineering, University of Limerick, Limerick, Ireland
2. Department of Mechanical Engineering, University of Bristol, Bristol, UK
3. Department of Mechanical & Automobile Engineering, Limerick Institute of Technology, Limerick, Ireland
4. Heinz Maier-Leibnitz Zentrum (MLZ) FRM II Technische Universität München Lichtenbergstr. 1, Garching, Germany