In the previous paper
2; we obtained the stress-strain-time relations of networks formed by chain polymers in the differential form. The relations were based on the theory of rubber-like elastioity and derived anden the assumption that the chains constituting the networks would be either broken or reformed time by time. The results were more general than the Green-Fobolsky's ones
3, But were so complicated that we could neither solve in analytical form nor apply to the actual problems (Eguations (1)-(6)).
The similar Problem was considered here in the integral form. At the first. we obtained the distribution functions of the chains constituting the networks by means of the direct consideration of deformation of the networks (Eg. (8))., and applied it to the stress exprssion (Eg. (9)-(12))., In the next parts, the work done by external forces (Eg. (14)) was derived form the above distribution function under some canditions, and the energy dissipation was calculated (Eg. (15)).
In the last parts of this paper, some special cases were treated wring the results obtained above; (i) cormparison with the Green-Tobolsky's calculation (§. 5.) (ii) treatment in the stationary state (§. 6), and (iii) the stress relaxation under the constant deformation (§. 7.) It is regretful that we could not Ireat the strain (daformation) relaxation under the constant stress (or, external force) in general from.
The notations used in this paper are as follows;
σ: stress tensor; α: strain (deformation) tensor;
α: transport of α; F (ξ, N, t), g (ξ, N, t), β (ξ, N): acutual number, reformation number, and breaking coefficient, respectively, of chains in the networks having N-statistical segments and ξ-end to end distance at time t; (ξ ξ): a tensor defined by (*); F. S. E: free energy, entropy, and internal energy depended only on volume, respectively, of the networks.
抄録全体を表示