Abstract
To confirm the usability of Cellulose Acetate as model material for studying photoplasticity, the various mechanical and optical behaviour of Cellulose Acetate must be examined. In this paper, two essential tests for photoplasticity is represented. One is the relaxation test to investigate the viscosity of the material, and the other is the repeated loading test to understand the effect of the history of prestraining. As results of these tests, it was obtained that the relaxations of stress and fringe order are expressed by Maxwell models, and the rapid relaxations of stress and fringe order, especially in early stage of deformation, set limits to the usability of Cellulose Acetate. The repeated loading test shows that the relation between stress and strain, and the relation between stress and fringe order do not depend on residual strain and fringe order, and then cumulated plastic fringe order is represented by cumulated plastic strain in the linear equation.
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