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УДК 539.3

 

Danil’chuk E.

G.S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

 

STUDY OF PROCESSES OF LONG-TERM DEFORMATION OF A TECHNICAL POLYPROPYLENE FIBROUS STRUCTURE

 

Purpose and the object of research. The creep and strength of a technical high-strength polypropylene threads with a titer of 1000 tex are investigated. This threads are used in woven tapes for transport and warehouse. Findings. The new results of experimental studies of polymer threads for short-term static tests and creep tests are received. The linearity areas of the viscoelastic properties for the investigated polymer threads are determined, an accomplishment of similarity of isochronal creep curves condition is proved and instantaneous deformation diagram is obtained. The long-term strength diagram is determined for a fairly wide range of stress. The possibility of applying linear and nonlinear theories of viscoelasticity is analyzed. It is shown that the application of Rabotnov’s nonlinear viscoelastic theory is the most effective for the description of creep processes of these materials. Application area. The research results can be used for calculating the deformation processes of woven materials made from these threads.

Keywords: polymer threads, stress-strain curve, creep, long-term strength, nonlinear theory of viscoelasticity.

 

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