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Experimental and theoretical investigation of stress corrosion crack (SCC) growth of polyethylene pipes

Authors
Choi, Byoung-HoChudnovsky, AlexanderParadkar, RaieshMichie, WilliamZhou, ZhenwenCham, Pak-Meng
Issue Date
5월-2009
Publisher
ELSEVIER SCI LTD
Keywords
Stress corrosion crack; Fracture initiation; Crack propagation; Crack layer theory; SEM; FTIR
Citation
POLYMER DEGRADATION AND STABILITY, v.94, no.5, pp.859 - 867
Indexed
SCIE
SCOPUS
Journal Title
POLYMER DEGRADATION AND STABILITY
Volume
94
Number
5
Start Page
859
End Page
867
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120177
DOI
10.1016/j.polymdegradstab.2009.01.016
ISSN
0141-3910
Abstract
Degradation of polymers is Usually manifested in a reduction of molecular weight, increase of crystallinity in semicrystalline polymers, increase of material density, a subtle increase in yield strength, and a dramatic reduction in toughness. Stress corrosion cracking (SCC) results from strongly coupled thermo-mechano-chemical processes, and is sensitive to material composition and morphology. The individual crack propagation stage is critical in determining the lifetime of pipe. Based on author's previous works, crack layer (CL) theory model is adopted in this study to describe the individual stress corrosion (SC) crack propagation kinetics and the time interval from crack initiation to instability and break through. The effect of localized chemical degradation at the crack tip on SC crack growth kinetics is addressed. Typical SC crack growth is presented and discussed as a step-wise manner based on the proposed model. In addition, scanning electron microscopy (SEM) observation and Fourier transform Infrared spectroscopy (FTIR) analysis of failed samples obtained by accelerated SCC tests are applied to validate the proposed model. SEM is useful to identify the change of fracture mechanisms from chemically driven crack to mechanically driven crack by the formation of visible striations. FTIR analysis enables tracking of the accumulation of chemical degradation by detecting the amount of carbonyls on the crack surface. Carbonyl index is defined to compare the amount of chemical degradation quantitatively. The purpose of this paper is to continue to develop the technical theory and understanding behind SCC phenomena to facilitate all polymer pipe industries and in particular the polyethylene pipe industry to design better resins and piping systems. (C) 2009 Elsevier Ltd. All rights reserved.
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