S. V. Petrova, S. V. Gladkovsky, S. V. Smirnov, D. I. Vichuzhanin

FRACTURE STRENGTH UNDER VARIOUS TYPES OF LOADING AND THE DAMPING CAPACITY OF LAYERED METAL–POLYMER COMPOSITES REINFORCED WITH BASALT FIBERS

Metal–polymer composites with layers of steel, aluminum, titanium alloys and interlayers of glass, organic, and carbon fiber plastics are increasingly widely used in aerospace and automotive industry products. The layered architecture of such materials provides them with high fatigue strength and resistance to brittle fracture, and the polymer constituent effectively damps external mechanical vibrations. The paper presents the results of studying a set of mechanical characteristics and mechanisms of destruction of hybrid layered metal–polymer composites based on the 09G2S steel, the AMg3 aluminum alloy, and polyetheretherketone (PEEK) thermoplastic polymer reinforced with 40% volume fraction of basalt fiber. Five-layered composites of four design types were made by hot pressing using a hot-curing adhesive. Impact tests using the three-point bending scheme reveal a high impact strength of the specimens made of the produced layered materials and a tendency for an abnormal increase in the KCV values as the test temperature decreases from +200 to −60 °С, with the preserved integrity of most layers of the composites. The highest recorded values of KСV ≥ 0.47–0.55 MJ/m2 were obtained on a composite containing one central and two external layers of the 09G2S steel, as well as two basalt fiber reinforced polymer interlayers. The cyclic tests of layered materials without a stress concentrator demonstrate that the highest number of cycles (N = 96 730) before destruction corresponding to a drop of applied load and delamination of individual metal layers from polymer ones is achieved in a composite with steel external layers and an aluminum central layer. The method of dynamic mechanical analysis is used to determine the damping capacity of the composites and the polymer constituent. Reinforcement of the PEEK polymer with unidirectional basalt fiber is shown to contribute to an increase in the damping parameters (tgδ, E', and E''). The study reveals the features and stages of the destruction of the layered composites, caused by the layered architecture and the properties of the constituent layers. It testifies that the studied five-layered metal-polymer composites have a fairly high level of impact strength, fatigue strength, and damping capacity.

Acknowledgment: The work was performed under the state assignment for the IES UB RAS, No 124020600045-0. The equipment of the Plastometriya shared research facilities at the IES UB RAS. We appreciate the assistance of Dr. P. V. Kosmachev and Dr. A. M. Patselov (both from the IPM UB RAS) in making specimens of laminated metal–polymer composites.

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