On the Experimental Plane Elastoplastic Stress Analysis by a Method Combining Birefringent Coating Method and Conducting Sheet Method. : Reinforcing Effect and Assumption for the Strain Normal to the Plane.

Abstract

From among many problems contained in this experimental method by which the stress analysis can be performed using only the indirect informations from the surface layer, the above two were picked up and the case of "a tension of a strip with semicircular notches" was investigated. As the specimen, an aluminium alloy strip regarded as isotropic solid that obeys von Mises' yield criterion and the flow theory was used and as the coating material, epoxypolysulfide copolymer was used. Mainly, the following conclusions were obtained: (1) The necessity of taking the reinforcing effect into consideration. (2) The appropriateness of the assumption V²ε₃=0 in a state of the restricted plastic deformation. (3) The unsuitableness of applying the deformation theory to the problems of this kind.