Abstract
Investigations were performed on the fatigue properties of satin woven glass cloth FRP under the pseudo random loading condition which was programmed in two different ways. Both the constant stress amplitude and the random loading tests were carried out by a hydraulic fatigue testing machine.The FFT analysis was conducted in order to identify the statistical nature of random load to be applied on the specimen. Then, discussions were made on the validity of evaluating the fatigue life under the Gaussian narrow band random loads with the aid of equivalent stress amplitude based upon Miner's rule.Also, the effect of number of cycles assigned for each stress step on the actual fatigue life in the program loading test was examined.As a result, it was shown that the fatigue life under various program loads could be estimated to some extent by the equivalent stress amplitude.
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