Conclusions
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1.
The decrease in the volumeθ (t) at the onset of creep of polyethylene (after the realization of positive elastic volume deformations) is accompanied by an increase in the number of twinned crystallites, which could be one of the structural mechanisms which causes condensation of the material on extension.
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2.
In the period of the intense decrease in the volume,θ (t) is linearly dependent on the longitudinal and transverse deformations; the proportionality factor is a function of the value of the load and the type of deformation.
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3.
Repeated loading causes a new decrease in the volume. The dependences ofθ (t) for initial and repeated loading do not coincide.
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Translated from Mekhanika Kompozitnykh Materialov, No. 1, pp. 19–24, January–February, 1985.
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Dzene, I.Y., Molchanov, Y.M., Rektin'sh, M.F. et al. Volume strains and structural changes in polyethylene with small creep flows. Mech Compos Mater 21, 13–18 (1985). https://doi.org/10.1007/BF00611799
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DOI: https://doi.org/10.1007/BF00611799