Numerical simulation in determining parameters of the model of damage accumulation in the composite material monolayer
Authors: Akulin P.V., Turbin N.V., Dudchenko A.A.
Published in issue: #10(166)/2025
DOI: 10.18698/2308-6033-2025-10-2483
Category: Aviation and Rocket-Space Engineering | Chapter: Strength and Thermal Conditions of Aircraft
Designing a structure made of the composite material requires taking into account reduction in the material stiffness characteristics during operation. Therefore, a comprehensive database of experiments is necessary, as it describes behavior of the composite material under various types of loading. Full-scale experiments are making it possible to determine degradation parameters in the composite material properties, but they are expensive and often difficult to implement when studying the complex stress states. This study presents a numerical simulation of degradation of the unidirectional composite material properties under the low-cycle loading. One of the main causes of the monolayer stiffness characteristics degradation is cracks initiation in the matrix structure. To conduct a virtual experiment, a mathematical model describing the elastic-plastic behavior of the matrix taking into account reduction in its physical properties is implemented in the UMAT subroutine of the Abaqus finite element software package. The paper considers an elementary representative volume consisting of the matrix and the composite material fibers to determine the monolayer degradation parameters. Numerical simulation results are validated against the full-scale test data. The obtained parameters of the composite material monolayer degradation during a virtual experiment at the microscale are making it possible to describe the monolayer nonlinear behavior taking into account the properties degradation at the macroscale when designing aircraft structures made of the composite materials.
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