The role of elastic recovery in the formation of tribological properties of ultra-molecular polyethylene with different size of the initial powders | Izvestiya vuzov. Fizika. 2020. № 5. DOI: 10.17223/00213411/63/5/141

The role of elastic recovery in the formation of tribological properties of ultra-molecular polyethylene with different size of the initial powders

The mechanical and tribological properties of ultra-high molecular weight polyethylene (UHMWPE) with the identical molecular weight but different sizes of the initial polymer powder (5-15, 120-150 and 330 µm) at various load-speed parameters of tribological tests ( P × V ) have been investigated. A SEM structural analysis of the subsurface layers beneath the wear track has been performed within the studied range of loads and sliding velocities ( P = 60-140 N, V = 0.3-0.5 m/s). The relationship between the wear rate and the level of elastic recovery (reversible deformation) has been established in order to use their values for postulating recommendations on predicting service life of products at various operating conditions. It has been shown that the size of the initial UHMWPE powder determines the dimension of structural elements (spherulites), as well as the crystallinity level of the samples fabricated by hot compression. For the studied materials and the range of load-speed parameters, it has been shown that the crystalline-to-amorphous phase ratio, as well as the load magnitude during the tribotests, determines the level of elastic recovery. It has been demonstrated that under moderate triboloading conditions ( P × V = 60 N×0.3 m/s), the UHMWPE specimens fabricated from a fine powder (with a maximum crystallinity of 56.5%) possess the highest value of elastic recovery (63%). In UHMWPE samples obtained from medium and coarse powders (having a crystallinity of about 30%), the level of elastic recovery is lower being equal to 40%. Under the severe tribological testing conditions ( P × V = 140 N×0.5 m/s), the level of elastic recovery for all initial UHMWPE powder sizes does not exceed 8%. From the obtained results one can conclude that the level of elastic recovery (reversible deformation) of ultrahigh-molecular molecular weight polyethylene is one of the factors limiting the allowable operation intervals ( P × V ) of tribounit components and can be used for predicting their service life.

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Keywords

сверхвысокомолекулярный полиэтилен, механические свойства, коэффициент трения, интенсивность износа, упругое восстановление, надмолекулярная структура, ultrahigh molecular weight polyethylene, mechanical properties, friction coefficient, wear factor, elastic recovery, permolecular structure

Authors

Name	Organization	E-mail
Panin S.V.	Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk Polytechnic University	svp@ispms.tsc.ru
Kornienko L.A.	Institute of Strength Physics and Materials Science of SB RAS	rosmc@ispms.tsc.ru
Buslovich D.G.	Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk Polytechnic University	buslovichdg@gmail.com
Alexenko V.O.	Institute of Strength Physics and Materials Science of SB RAS	vl.aleksenko@mail.ru

Всего: 4

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