Composite Material Properties Degradation under the Multi-Cycle Loading

Abstract

The paper studies endurance strength of the composite material. The problem is relevant because most existing mathematical models describing the composite material properties degradation under the multi-cycle loading are empirical. A broad basis for the full-scale experiments is required to compute the composite material endurance strength. A full-scale experiment of the cantilever bending of a plate made of the layered composite material with the free end rigid loading was conducted. The total number of the sample loading cycles was 768,000. The sample was reinforced with the unidirectional carbon fiber and woven organoplastics, and had a complex laying pattern with the layers tapering along the sample length. During testing, a decrease in strength properties of the composite material layer package with the number of loading cycles was established. A decrease in stiffness indicated appearance and propagation of cracks in the material matrix leading to a decrease in the composite material ultimate physical characteristics and, as a consequence, could cause the premature structure failure. The obtained results make it possible to expand the basis for full-scale multi-cycle testing of the composite material subjected to the bending loading

Please cite this article in English as:

Akulin P.V., Nasonov F.A. Composite material properties degradation under the multi-cycle loading. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 1 (152), pp. 4--13 (in Russ.). EDN: UXYWYU

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