A pure curvature mode Cv 1 is obtained if the logarithm term vanishes, i.e. if C2o = 0. From (2.7a), this leads to two solutions: one is with b = 0 and the other with Mr{b} = Mr{a}. The coefficient D20 is identical for the two solutions which are expressed by

Finally, by identifying the A20 coefficient in (2.1) with D20 coefficient, the curvature of the flexure mode Cv 1 is

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