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Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 4: sporadic fatigue crack propagation
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SYSNO ASEP 0532380 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 4: sporadic fatigue crack propagation Author(s) Bucknall, C. (GB)
Altstädt, V. (DE)
Auhl, D. (DE)
Buckley, P. (GB)
Dijkstra, D. (DE)
Galeski, A. (PL)
Gögelein, C. (DE)
Handge, U. A. (DE)
He, J. (CN)
Liu, C.-Y. (CN)
Michler, G. (DE)
Piorkowska, E. (PL)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Vittorias, I. (CH)
Wu, J. J. (GB)Source Title Pure and Applied Chemistry. - : Walter de Gruyter - ISSN 0033-4545
Roč. 92, č. 9 (2020), s. 1521-1536Number of pages 16 s. Language eng - English Country DE - Germany Keywords consolidation ; crazing ; fatigue Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000574259400005 DOI 10.1515/pac-2019-0408 Annotation 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, -MW, 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://www.degruyter.com/view/journals/pac/92/9/article-p1521.xml?tab_body=abstract
Number of the records: 1