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MODELING OF NONLINEAR BEHAVIOR OF COMPOSITE MATERIALSтезисы доклада
- Авторы: Lomakin E.V., Fedulov B.N.
- Сборник: XLIV International Conference “Advanced Problems in Mechanics” (APM 2016), June 27-July 02, 2016, St. Peterburg: Book of abstracts
- Тезисы
- Год издания: 2016
- Место издания: Russia
- Первая страница: 75
- Последняя страница: 75
- Аннотация: Three mathematical models for characterization of different types of nonlinearity of composites behavior under deformation are proposed. The physical nonlinearities of composite materials are usually defined by heterogeneous nature, mechanical properties of constituents, the presence of initial defects caused by imperfections of manufacturing technologies and others. The corresponding approach is proposed, where two types of physical nonlinearity are taken into account, one of which is the stress state dependence of material properties (or their susceptibility to the loading conditions) and the second one is concerned the nonlinearity of stress – strain curves under conditions of shear loading, while the diagrams are approximately linear when the load acts along reinforcement. The corresponding constitutive relations are proposed to describe the considered types of physical nonlinearities of composite materials. To describe the first type of physical nonlinearity in the behavior of composite materials, the stress state parameter is introduced into constitutive relations [1, 2]. To take into account the nonlinear shear behavior of a material, the parameter that represents the degree of shear stresses or deformations is formulated and an additional tensor is introduced in constitutive relations, which can be considered as an additional structural parameter characterizing the anisotropic properties of a material. The method for the determination of anisotropic material functions is proposed and its effectiveness in characterization of behavior of composite materials is demonstrated on the base of experimental data for laminate made of the glass cloth and polyether matrix. Several experimental tests show a successful application of proposed model to conventional glass/carbon – epoxy laminate composites.
- Добавил в систему: Ломакин Евгений Викторович