Clive Bucknall
Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 4: sporadic fatigue crack propagation
Bucknall, Clive; Altstädt, Volker; Auhl, Dietmar; Buckley, Paul; Dijkstra, Dirk; Galeski, Andrzej; Gögelein, Christoph; Handge, Ulrich A.; He, Jiasong; Liu, Chen-Yang; Michler, Goerg; Piorkowska, Ewa; Slouf, Miroslav; Vittorias, Iakovos; Wu, Jun Jie
Authors
Volker Altstädt
Dietmar Auhl
Paul Buckley
Dirk Dijkstra
Andrzej Galeski
Christoph Gögelein
Ulrich A. Handge
Jiasong He
Chen-Yang Liu
Goerg Michler
Ewa Piorkowska
Miroslav Slouf
Iakovos Vittorias
Professor Junjie Wu junjie.wu@durham.ac.uk
Professor
Abstract
Fatigue tests were carried out on compression mouldings supplied by a leading polymer manufacturer. They were made from three batches of ultra-high molecular weight polyethylene (UHMWPE) with weight-average relative molar masses, ¯¯¯¯ M W, of about 0.6 × 106, 5 × 106 and 9 × 106. In 10 mm thick compact tension specimens, crack propagation was so erratic that it was impossible to follow standard procedure, where crack-tip stress intensity amplitude, ΔK, is raised incrementally, and the resulting crack propagation rate, da/dN, increases, following the Paris equation, where a is crack length and N is number of cycles. Instead, most of the tests were conducted at fixed high values of ΔK. Typically, da/dN then started at a high level, but decreased irregularly during the test. Micrographs of fracture surfaces showed that crack propagation was sporadic in these specimens. In one test, at ΔK = 2.3 MPa m0.5, there were crack-arrest marks at intervals Δa of about 2 μm, while the number of cycles between individual growth steps increased from 1 to more than 1000 and the fracture surface showed increasing evidence of plastic deformation. It is concluded that sporadic crack propagation was caused by energy-dissipating crazing, which was initiated close to the crack tip under plane strain conditions in mouldings that were not fully consolidated. By contrast, fatigue crack propagation in 4 mm thick specimens followed the Paris equation approximately. The results from all four reports on this project are reviewed, and the possibility of using fatigue testing as a quality assurance procedure for melt-processed UHMWPE is discussed.
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 20, 2020 |
Online Publication Date | Aug 24, 2020 |
Publication Date | 2020 |
Deposit Date | Dec 9, 2020 |
Publicly Available Date | Dec 9, 2020 |
Journal | Pure and Applied Chemistry |
Print ISSN | 0033-4545 |
Electronic ISSN | 1365-3075 |
Publisher | International Union of Pure and Applied Chemistry |
Peer Reviewed | Peer Reviewed |
Volume | 92 |
Issue | 9 |
Pages | 1521-1536 |
DOI | https://doi.org/10.1515/pac-2019-0408 |
Public URL | https://durham-repository.worktribe.com/output/1255669 |
Files
Published Journal Article
(1.8 Mb)
PDF
Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
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