In his most important point Professor Stephan is completely correct. That is, his shear coefficient and mine are identical. I was aware of his work when it first came out and discounted it because it was derived by solving a static problem for a specific type of loading. It implied that the shear coefficient for the static problem was a function of the type of loading and, further, that by choosing the right type of static loading one could find the best value of the shear coefficient for dynamic loads. As it turns out both of these implications are correct.

Professor Stephan states, “The motivation of Hutchinson appears to be the construction of a theory in which the shear coefficient takes on the “best” value. I did not mean to convey that impression. My motivation was simply to construct a simple, consistent, dynamic theory which...

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