Fracture mechanics testing for environmental stress cracking in thermoplastics

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Title: Fracture mechanics testing for environmental stress cracking in thermoplastics
Authors: Kamaludin, MA
Patel, Y
Blackman, BRK
Williams, JG
Item Type: Journal Article
Abstract: Under the combined influence of an aggressive environment and applied stress, engineering thermoplastics may undergo a phenomenon known as environmental stress cracking (ESC). This can result in adverse effects such as embrittlement and premature failure in service, due to the growth of environmentally-induced cracks to critical sizes, with little to no fluid absorption in the bulk material. Fracture mechanics is proposed as a suitable scheme to study and quantify ESC, with the aim being to obtain characterising data for different polymer-fluid combinations of interest, as well as to develop a reliable fracture mechanics test protocol. In the proposed method, slow crack growth is monitored to assess the effect of a range of applied crack driving forces (K, or alternatively G) on observed crack speeds, as opposed to simply measuring time-to-failure. This paper presents the results of experiments performed on the following materials: linear low density polyethylene (LLDPE) in Igepal solution and high impact polystyrene (HIPS) in sunflower oil. A discussion of the various issues surrounding the data analysis for these long-term tests is also included, as the attainment of consistent and repeatable results is critical for a method to be internationally standardised, which is a goal of the European Structural Integrity Society (ESIS) Technical Committee 4 from whose interest this work is drawn.
Issue Date: 21-Jul-2016
Date of Acceptance: 21-Jul-2016
ISSN: 2452-3216
Publisher: Elsevier
Start Page: 227
End Page: 234
Journal / Book Title: Procedia Structural Integrity
Volume: 2
Copyright Statement: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Notes: publisher: Elsevier articletitle: Fracture mechanics testing for environmental stress cracking in thermoplastics journaltitle: Procedia Structural Integrity articlelink: content_type: article copyright: © 2016 The Author(s). Published by Elsevier B.V.
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering

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