1. Research Assistant, Advanced Composites Centre for Innovation and Science, Dept. of Aerospace Engineering, Univ. of Bristol, Queen’s Building, Bristol BS8 1TR, U.K.
2. Research Assistant, ACCIS, Dept. of Aerospace Engineering, Univ. of Bristol, Queen’s Building, Bristol BS8 1TR, U.K.
3. Professor in Lightweight Structures, ACCIS, Dept. of Aerospace Engineering, Univ. of Bristol, Queen’s Building, Bristol BS8 1TR, U.K. (corresponding author).