Issue 67

B.N. Fedulov et alii, Frattura ed Integrità Strutturale, 67 (2024) 311-318; DOI: 10.3221/IGF-ESIS.67.22

Longitudinal elastic nonlinearity of composite material

B.N. Fedulov, D.A. Bondarchuk, E.V. Lomakin Lomonosov Moscow State University, Russian Federation fedulov.b@mail.ru, http://orcid.org/ /0000-0002-1894-5964 bondarchuk.da@gmail.com, http://orcid.org/0000-0001-7178-8585 evlomakin@yandex.ru, http://orcid.org/ 0000-0002-8716-5363

Citation: Fedulov, B.N., Bondarchuk, D.A., Lomakin, E.V., Longitudinal elastic nonlinearity of composite material, Frattura ed Integrità Strutturale, 67 (2024) 311-318.

Received: 07.11.2023 Accepted: 11.12.2023 Online first: 12.12.2023 Published: 01.01.2024

Copyright: © 2024 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

K EYWORDS . Fiber waviness, Continuum model, E lastic nonlinearity, Compressive modulus, Unidirectional composite.

I NTRODUCTION

omposite materials have gained immense significance in a number of industrial sectors due to their exceptional mechanical properties and versatility. These materials typically consist of a combination of reinforcing fibers and a matrix, offer unique advantages such as high strength-to-weight ratios, corrosion resistance, and tailored performance characteristics. Understanding and optimizing the mechanical behavior of composite materials is of quite importance, particularly in industries where they play a critical role, such as aerospace, automotive, and construction. It is well known that the elastic properties of the composite depend on the type of loading [1-3]. For example, the difference in Young's modulus obtained under uniaxial tension and uniaxial compression in some laminated composites can reach up to 40%. C

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