In the transverse bending of thin elastic plates, the stress usually depends on Poisson's ratio, v, and in the case of a plate of infinite width having a circular hole, in pure bending, the stress concentration factor can be expressed as (5+3v)/(3+v). But the effect of Posson's ratio has not yet been clarified in the case where the width of the plate becomes finite. In this paper, the problem above-mentioned is investigated by using the Poisson-Kirchhoff theory. Parametric coefficients included in the function, which expresses the deflection, are determined by the perturbation method. Especially, the maximum stress induced in the plate is expanded in a power series of two variables ; i. e., the ratio of the hole diameter to the full width of the strip and a parameter including v.
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