Method of mechanical spectroscopy of pipe grades of polyethylene

Ivanov M.S., Kuleznev V.N.
UDC
678
DOI
10.18577/2307-6046-2016-0-11-9-9
Article PDF (Russian) (734.67 KB)
How to cite
Ivanov M.S., Kuleznev V.N. Method of mechanical spectroscopy of pipe grades of polyethylene // Proceedings of VIAM. 2016. No. 11. DOI: 10.18577/2307-6046-2016-0-11-9-9. URL: https://test.viam.ru/en/journal/2016/11/9
Keywords
method of step loading, polyethylene pipe grades, tie molecule.
Abstract

The method of research of creep at step loading is offered and the device of automatic registration of deformation is developed. This method consists in uniaxial step stretching of polymer sample in isothermal conditions at temperature of 100°C when mobility of supermolecular structures of polymer is facilitated. As a result the dependence of relative deformation on time is having the step appearance . The constant deformation, i.e. equilibrium deformation of certain structural elements remains on each step of this curve. The curve consists of three sites: on the first the Hooke law is carried out; the second is responsible for step creep; on the third is developed the general plastic strain and sample passes to neck. Sample reduction to the initial sizes is also revealed at loading reduction after step loading. It is supposed that driving force of process of retardation are relaxation processes. The method of step loading is peculiar «mechanical spectroscopy» of supermolecular structu

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