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Fatigue crack growth in polymers. I. Effect of frequency and temperature
Author(s) -
Radon J. C.,
Culver L. E.
Publication year - 1975
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760150705
Subject(s) - materials science , polycarbonate , cyclic stress , composite material , tension (geology) , paris' law , fracture mechanics , crack closure , stress intensity factor , polymer , stress (linguistics) , linguistics , philosophy , ultimate tensile strength
The effects of frequency, from 0.1–100 Hz, and temperature, −60°C to +21°C, on fatigue crack propagation in poly (methyl methacrylate) and polycarbonate were investigated. A cyclic crack propagation law proposed by Arad‐Radon‐Culver, namely\documentclass{article}\pagestyle{empty}\begin{document}$$ {{{\rm d}\left({{\rm 2}a} \right)} \mathord{\left/ {\vphantom {{{\rm d}\left({{\rm 2}a} \right)} {{\rm d}N = \beta \lambda ^n }}} \right. \kern-\nulldelimiterspace} {{\rm d}N = \beta \lambda ^n }} $$\end{document}where λ is ( K max 2 ‐ K min 2 ) and K max and K min are the respective values of maximum and minimum stress intensity factor, was applied to describe a relationship between crack growth and cyclic life. Cyclic tests performed in tension between zero load and K max showed a linear relationship between the crack lengths and the number of cycles for all temperatures and frequencies tested. It was found that, in general, the cyclic crack growth decreased with decreasing temperature and increasing frequency. However, important exceptions to this rule have been noted.