The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading
Ilya A. Morozov 1,2,*
, Alexander S. Mamaev 3, Mikhail V. Bannikov 1, Anton Yu. Beliaev 1 and Irina V. Osorgina 2
, Alexander S. Mamaev 3, Mikhail V. Bannikov 1, Anton Yu. Beliaev 1 and Irina V. Osorgina 2
1
Institute of continuous media mechanics, Ural Branch of Russian Academy of Sciences, Academika Koroleva st. 1, 614013 Perm, Russia
2
Department of Mechanics of Continuous Media and Computational Technologies, Perm State University, Bukireva st. 15, 614990 Perm, Russia
3
Institute of Electrophysics, Ural Branch of Russian Academy of Sciences, Amundsen st. 106, 620016 Ekaterinburg, Russia
*
Author to whom correspondence should be addressed.
Coatings 2018, 8(2), 75; https://doi.org/10.3390/coatings8020075
Received: 6 January 2018 / Revised: 9 February 2018 / Accepted: 11 February 2018 / Published: 14 February 2018
Abstract
Plasma treatment of soft polymers is a promising technique to improve biomedical properties of the materials. The response to the deformation of such materials is not yet clear. Soft elastic polyurethane treated with plasma immersion ion implantation is subjected to fatigue uniaxial loading. The influence of the strain amplitude and the plasma treatment regime on damage character is discussed. Surface defects are studied in unloaded and stretched states of the material. As a result of fatigue loading, transverse cracks (with closed overlapping edges as well as with open edges deeply propagating into the polymer) and longitudinal folds which are break and bend inward, appear on the surface. Hard edges of cracks cut the soft polymer which is squeezed from the bulk to the surface. The observed damages are related to the high stiffness of the modified surface and its transition to the polymer substrate. View Full-TextKeywords:
plasma treatment; fatigue loading; fracture; polyurethane; surface morphology
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Morozov, I.A.; Mamaev, A.S.; Bannikov, M.V.; Beliaev, A.Y.; Osorgina, I.V. The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading. Coatings 2018, 8, 75.
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