A PREVIOUS paper by Mansfield considered the problem of the torsion of a doubly symmetrical rectangular box containing a large number of equidistant identical webs. Mansfield overcame the practical difficulty involved in solving the large number of simultaneous equations by an ingenious approximate method consisting of the replacement of the webs by an equivalent continuous medium. This device resulted in the derivation of a simple differential equation instead of the system of simultaneous equations.
Wittrick, W.H. (1953), "Torsion of a Multi‐webbed Rectangular Tube: An Exact Solution of the Problem Treated Approximately by Mr Mansfield", Aircraft Engineering and Aerospace Technology, Vol. 25 No. 12, pp. 372-372. https://doi.org/10.1108/eb032366
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