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Elastic-plastic shear buckling of square steel plates.with,holes is investigated experimentally. The plates are subjected to in-plane shearing deformations, and have edges supported thin or thick stiffeners and centrally located circular holes. Diameters d of the hole are 0.3 l, 0.5 l and 0.7 l where l is length of the plate edge. Experimental buckling strength of perforated plates with thin edge stiffeners shows fairly good agreement with analytical results of uniform shear stress deformations and the case of thick edge stiffeners shows good agreement with analytical results of uniform shear deformations. It is concluded that the thick edge stiffeners restrain the in-plane deformations and increase the buckling strength.

Elastic-plastic shear buckling of square plates containing centrally located circular holes is investigated analytically. The plates are subjected to uniform shear stresses or uniform shear deformations. Ratios of the hole diameter to the plate length, d/l, are 0.15, 0.3, 0.5, 0.7,and 0.85. The influence of the circular hole and in-plane loading condition on buckling strength is considered on various sized holes. The results suggest that the buckling strength in the uniform shear deformations is higher than the unfiorm shear stresses in the elastic and elastic-plastic ranges. These phenomena are more remarkable in the clamped plates than the simply supported plates.

Elastic-plastic shear buckling of square steel plates with circular holes is investigated experimentally. The plates are subjected to in-plane shearing deformations, and have edges supported stiffeners and centrally located circular holes. Ratio of hole diameter to the plate length, d/1, are 0.3, 0.5 and 0.7. Experimental stresses along the plate edges show good agreement with finite element analysis. At hole edges, experimental stresses are greater than the analysis. The edge stiffeners restrain the in-plane deformations and increase the buckling strength. Experimental buckling strength of perforated plates with edge stiffeners is shown between analytical results of uniform shear stress deformations and uniform shear deformations.

Formulations of most generalized continuum mechanics have been based on a priori definition of directors except Eringen and his coworkers. Similarly we also have been trying to formulate the theory of general multi-directed continua, each material point of which has m single directors and n director polyads. The aim of this paper is to clarify the geometrical relation of directors and the physical meaning of director stresses and forces of general multi-directed continua by means of deriving directors from microscopical structures of an ideal model and reformulating director stresses etc. by the microscopical Cauchy's laws of motion.