A model for lifetime prediction of a parallel-lay aramid rope is developed based on stress-rupture test results of specimens of different sizes. The tests were conducted at ambient temperature with specimens subjected to static stress levels ranging from 67.3% to 84.4% of the ultimate tensile strength and times-to-break extending to nine months. The Weibull statistical distribution was selected to describe the scatter of the experimental data which allows the assignment of probability levels for the estimated lifetime.
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