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Fatigue fracture of nylon polymers

Part 1 Effect of frequency

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Abstract

The purpose of this study was to determine the effect of frequency on fatigue crack propagation rates in unfilled nylon polymers. Specifically it was of interest to investigate the frequency dependence under conditions where hysteretic heat generation did not occur. For dry injection-moulded nylon the results demonstrate that a strong frequency dependence exists with higher crack propagation rates at lower frequencies. This indicates that the mechanism of fatigue crack growth at room temperature is primarily one of creep crack growth, especially at frequencies below 1.0 Hz. It is also noted that hysteretic heating causes fracture mode transitions to occur during stable fatigue crack propagation in injection-moulded nylons, even at relatively low cyclic frequencies (5.0 Hz).

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Authors and Affiliations

  1. Polymers Department, General Motors Research Laboratories, and General Motors Advanced Engineering Staff, 48090-9055, Warren, Michigan, USA

    M. G. Wyzgoski

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  1. M. G. Wyzgoski
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  2. G. E. Novak
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  3. D. L. Simon
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Wyzgoski, M.G., Novak, G.E. & Simon, D.L. Fatigue fracture of nylon polymers. J Mater Sci 25, 4501–4510 (1990). https://doi.org/10.1007/BF00581115

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  • DOI: https://doi.org/10.1007/BF00581115

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