組合せ応力を受ける軟化セルロイドの変形の粘-粘弾性模型による表示

概要

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By applying the combined stress state of axial tensile stress and torsional one to a thinwalled tubular specimen, the deformation behaviour of softened celluloid by heating was observed. These data were represented by a viscous-viscoelastic model proposed by Findley et al.. In this model, the strain is resolved into five components: linearly elastic, time-independent plastic, time-dependent nonrecoverable viscous (positive), time-dependent nonrecoverable viscous (negative) and time-dependent recoverable viscoelastic. The comparison of these test data with the calculation by this model shows that deformation of the material, when stress is varied continuously by a constant stress rate or is changed stepwise under cyclic loading, may be represented by the viscous-viscoelastic model by using the creep test of stepwise constant stress followed by a recovery test after removal of stress. It seems necessary to make further investigation in order to represent the decrease of deformation resistance under the reversal of stress quite well for the case of stress reversal.
社団法人日本材料学会の論文
1982-04-15