直交異方性材料積層板の四点曲げ試験法 （Ｉ） 四点曲げモデルによる数値解析

Abstract

This paper presents an analysis, in the framework of the classical theory of plates, on the pure bending deformation produced in the four points bending tests of symmetric crossplies of fiber reinforced composites. The aim of the analysis is to establish conditions on the test specimens and devices to realize the pure bending deformation at least in a central portion of the specimens. Exact solutions by way of trigonometric series expansion are obtained for an idealized model; a rectangular plate subject to a uniformly distributed moment along a pair of parallel ends whose deflection is constrained. Numerical solutions are calculated by finite element method for four types of model subjected to concentrated loads simulating the actual loading mechanisms. The results show that the pure bending deformation depends not only on the laminates composition but also on the length of the specimen, the span between the loading cylinders and the span between the supporting cylinders of the test device as the ratios to the specimen breadth.