Effect of Test Frequency and Water Content on Localized Crack-Tip Heating in Nylon 66.

摘要

Fatigue crack propagation (FCP) tests were conducted on nylon 66 specimens equilibrated over a range of moisture levels and test frequencies 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. (Author)