“…Approximations of deformed plate profiles were assumed based on eigenvalue analyses, to find the best fit of the experimental results. This technique, known as mode approximation, was originally proposed by Martin and Symonds (1966) for small-deflection problems, however, it was later applied with success by Chon and Symonds (1977), Symonds and Chon (1979) and Nurick et al (1987) to moderately large-deflection problems. The highest deflection-thickness ratios successfully predicted using this method were reported by Nurick et al (1987)…”