PVC-DOP系の非線型クリープおよび破壊における時間-温度-濃度換算法則の検討

概要

論文の詳細を見る
Time-concentration dependence of ultimate properties for polyvinyl chloride-dioctyl phthalate (PVC-DOP) sheets in the rubbery and glassy regions were examined simultaneously with time-temperature dependence at various volume fractions of PVC (v_2) ranging from 0.191 to 0.699. By the time-concentration superposition, the data of tensile strength σ_b and ultimate strain α_b composed respective master curves on a plot of log σ_bρ_s/ρ vs. log t_b and log (α_b-1) vs. log t_b, where ρ is weight of PVC per unit volume of sheet, ρ_s is a ρ arbitrarily selected as reference and t_b is the breaking time observed by the test at a constant strain rate. The shift distance seemed to be equal to those obtained from time-concentration superposition of the tensile creep compliance ρD/ρ_s. The compliance D_2 was defined by the relation, D_2=(α-1)/ασ(1-λ_0ρ), based on a molecular theory of rubberlike elasticity by Sato, where σ,α denote the tension and the relative extension and λ_0 is average degree of contraction of network chains at the natural state. The observed compliance for the specimens of PVC coincided with the above compliance D_2 up to very high extension. For smaller extensions α, the relation, D_1=(α-1)/ασ, was satisfactory. The experimental shift distances were larger than those given by the WLF equation, and excessive parts of the distances seemed to be represented by the Arrhenius equation. A failure envelope was also constructed from these ultimate properties data. The data obtained for the specimens at high v_2, however, did not form a single master curve but gave a domain similar to that for natural rubber in time-temperature regions where chrystallization proceeded.
社団法人日本材料学会の論文
1967-07-15

PVC-DOP系の非線型クリープおよび破壊における時間-温度-濃度換算法則の検討

スポンサーリンク

概要

著者

関連論文

スポンサーリンク