The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride

The cyclic fatigue crack behavior of polyvinyl chloride (PVC), with (PVC-M) and without (PVC-U) chlorinated polyethylene (CPE) impact modifier, was studied. The effect of impact modifier upon fatigue crack growth rate and threshold was evaluated at frequencies of 1, 7, and 20 Hz. It was shown that t...

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Main Authors:	Samat, Noorasikin, Burford, Robert, Whittle, Alan, Hoffman, Mark
Format:	Article
Language:	English
Published:	Wiley 2009
Subjects:	TP1080 Polymers, plastics and their manufacture
Online Access:	http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/1/fatigue-air.pdf

id	iium-2839
recordtype	eprints
spelling	iium-28392011-10-11T01:30:47Z http://irep.iium.edu.my/2839/ The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride Samat, Noorasikin Burford, Robert Whittle, Alan Hoffman, Mark TP1080 Polymers, plastics and their manufacture The cyclic fatigue crack behavior of polyvinyl chloride (PVC), with (PVC-M) and without (PVC-U) chlorinated polyethylene (CPE) impact modifier, was studied. The effect of impact modifier upon fatigue crack growth rate and threshold was evaluated at frequencies of 1, 7, and 20 Hz. It was shown that the addition of CPE lowered the threshold stress intensity factor amplitude for crack growth (ΔKth) of PVC-M compared to that of PVC-U at lower frequencies, and that the effect became more pronounced at lower frequency. At lower stress intensity factor amplitudes (below ΔK = 1 MPa·m1/2), there was a slight difference between the crack growth rates of U- and M-PVC. The crack advance mechanism is investigated by microscopic observation of the crack tip process zone. Although the zone is relatively large in PVC-M, associated with higher toughness, it did not improve the fatigue crack growth resistance significantly. Fracture surface observations reveal a higher density of fibrils on the fatigued surface of PVC-M with the density, relative to that observed in PVC-U, reducing with frequency. It is therefore hypothesized that accelerated fibril failure is a mechanism of fatigue. Wiley 2009-07 Article PeerReviewed application/pdf en http://irep.iium.edu.my/2839/1/fatigue-air.pdf Samat, Noorasikin and Burford, Robert and Whittle, Alan and Hoffman, Mark (2009) The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride. Polymer Engineering and Science, 49 (7). 1299 -1310. ISSN 1548-2634 http://onlinelibrary.wiley.com/doi/10.1002/pen.21369/abstract 10.1002/pen.21369
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TP1080 Polymers, plastics and their manufacture
spellingShingle	TP1080 Polymers, plastics and their manufacture Samat, Noorasikin Burford, Robert Whittle, Alan Hoffman, Mark The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
description	The cyclic fatigue crack behavior of polyvinyl chloride (PVC), with (PVC-M) and without (PVC-U) chlorinated polyethylene (CPE) impact modifier, was studied. The effect of impact modifier upon fatigue crack growth rate and threshold was evaluated at frequencies of 1, 7, and 20 Hz. It was shown that the addition of CPE lowered the threshold stress intensity factor amplitude for crack growth (ΔKth) of PVC-M compared to that of PVC-U at lower frequencies, and that the effect became more pronounced at lower frequency. At lower stress intensity factor amplitudes (below ΔK = 1 MPa·m1/2), there was a slight difference between the crack growth rates of U- and M-PVC. The crack advance mechanism is investigated by microscopic observation of the crack tip process zone. Although the zone is relatively large in PVC-M, associated with higher toughness, it did not improve the fatigue crack growth resistance significantly. Fracture surface observations reveal a higher density of fibrils on the fatigued surface of PVC-M with the density, relative to that observed in PVC-U, reducing with frequency. It is therefore hypothesized that accelerated fibril failure is a mechanism of fatigue.
format	Article
author	Samat, Noorasikin Burford, Robert Whittle, Alan Hoffman, Mark
author_facet	Samat, Noorasikin Burford, Robert Whittle, Alan Hoffman, Mark
author_sort	Samat, Noorasikin
title	The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
title_short	The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
title_full	The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
title_fullStr	The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
title_full_unstemmed	The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
title_sort	effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride
publisher	Wiley
publishDate	2009
url	http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/ http://irep.iium.edu.my/2839/1/fatigue-air.pdf
first_indexed	2023-09-18T20:10:30Z
last_indexed	2023-09-18T20:10:30Z
_version_	1777407445291761664

The effects of frequency on fatigue threshold and crack propagation rate in modified and unmodified polyvinyl chloride

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