Considered are two types of multistage cyclic block loading rather common in the practice of fatigue tests and fatigue life predictions for layered polymer composite materials: block loading by four-stage cyclic regular zero-tension loads and block loading by multistage (8-10 levels) asymmetric cyclic loads. In order to improve the prediction accuracy for the fatigue life of carbon-fiber-reinforced plastics under such loadings, special nonlinear fatigue damage accumulation models are proposed. Elaborated are methods for predicting the fatigue life of carbon-fiber-reinforced plastics by the models proposed. The prediction methods are verified by the example of T800/5245 and AS4/3501-6 carbon-fiber-reinforced laminates. A relatively high accuracy of fatigue life predictions for the laminates was obtained as compared with that given by prediction methods using the Palmgren–Miner rule.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 56, No. 1, pp. 161-176, January-February, 2020.
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Strizhius, V. Models of Nonlinear Fatigue Damage Accumulation Under Cyclic Block Loadings of Layered Composites. Mech Compos Mater 56, 111–120 (2020). https://doi.org/10.1007/s11029-020-09865-7
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DOI: https://doi.org/10.1007/s11029-020-09865-7