1. Ph.D. Candidate, Dept. of Mechanical Engineering, Univ. of Sheffield, Sheffield S13JD, South Yorkshire, UK (corresponding author).
2. Dept. of Civil and Structural Engineering, Univ. of Sheffield, Sheffield S13JD, South Yorkshire, UK.
3. Professor, Dept. of Mechanical Engineering, Univ. of Sheffield, Sheffield S13JD, South Yorkshire, UK.