高分子固体の塑性変形における複屈折現象について : セルロイドの光塑性

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Recently several studies of the photoplasticity are proceeded. In this paper, the fundamental law about the birefringent phenomena in plastic deformation of high polymer solids is investigated. In the first place, as the definition of strain the Lagrangian representation of finite deformation is adopted according to V.V. Novozhilov. And it is induced theoretically from the four appropriate demands that the fring order per unit thickness N representing the birefringent effect is expressed, in the plane strain state, by the sum of a term in proportion to the principal stress difference (σ_1-σ_2) and a term in proportion to the principal strain difference (ε_1-ε_2) : N=C_1・(σ_1-σ_2)+C_2・(ε_1-ε_2). Within the limits of the elastic deformation region, the above formula is reduced to the well known formula in photoelasticity, i.e. the fring order is proportional to the principal stress difference. In our experiment, the celluloids of the five kinds different in the quantities of the camphor are adopted. In order to maintain the test piece in the plane strain state, it is held between two flat glass plates ; and in order to maintain the constant loading direction, the ordinary loading apparatus of photoelasticity is improved to be able to shift the fulcrum of its lever with the increasing load. The coefficients C_1 and C_2 are determined by the least square method. And the appropriateness of the above theoretical formula is proved in the elastic and the plastic deformation regions of the celluloid material.
社団法人日本材料学会の論文
1961-01-15

高分子固体の塑性変形における複屈折現象について : セルロイドの光塑性

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