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On the similarity conditions in the photorheological method of stress analysis

The similarity conditions and the feasibility of performing similarity model tests are discussed for the photorheological method - a technique proposed by one of the present authors for analysing the general process of nonsteady inelastic deformation. The conditions for similarity of model and prototype are established from the governing deformation equations by using dimensional analysis theory. The constitutive equation of elastic-viscoplastic material is assumed. The feasibility of conducting similarity model tests is predicted by comparing nondimensional stress-strain curves of a mild steel prototype (at elevated temperature) and a model of softened celluloid.