Effect of test frequency and water content on localized crack-tip heating in nylon-6,6 |
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Authors: | MT Hahn RW Hertzberg JA Manson RW Lang PE Bretz |
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Affiliation: | Materials Research Center, Lehigh University, Bethlehem, PA 18015, USA |
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Abstract: | Fatigue crack propagation (FCP) tests were conducted at various frequencies on nylon-6,6 specimens equilibrated over a range of moisture levels to determine the crack growth rates and the crack-tip temperatures as a function of water content. Frequency-sensitivity was correlated with the amount of crack-tip heating taking place, with crack-tip temperature being found to depend strongly on the estimated loss compliance, D″, of the material. The frequency-sensitivity of FCP in nylon was seen also to be affected by mean stress, suggesting that creep processes are often significant in FCP of nylon. |
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Keywords: | Fatigue nylon-6 6 hysteretic heating frequency water content fracture mechanics |
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