МОДЕЛЮВАННЯ РУЙНУВАННЯ КОМПОЗИЦІЙНИХ МАТЕРІАЛІВ У ВИПАДКУ СКЛАДНОГО НАПРУЖЕНОГО СТАНУ

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Urgency of the research. Modern trends in the development of mechanical engineering, based on the usage of advanced materials, which have significant advantages over traditional materials. Study of the destruction nature of such materials under the inf­luence of operational loads at the design stage of the product ensures the determination of the period of failure-free operation and the working capacity of the mechanisms. Therefore, there is a need to study the kinetics of fracture of composite materials in the initiation of microfractures, which corresponds to the activation process of complete destruction of the machine assembly. Target setting. Investigation of the destruction of composite materials is based on the concepts of the representation of the homogeneity of the structure, the multicomponent material and its physico-mechanical properties. The problem of creating of mathematical models, which describe the destruction of composite materials, as well as methods of its control, for example, ultrasonic displacements of surfaces, is additionally associated with various mathematical apparatus, describing the kinetics of the destruction of such materials. Actual scientific researches and issues analysis. We were considered the latest publications with publicly available, including the concept of fracture of composite materials in the form of a fiber bundle. Uninvestigated parts of general matters defining. Study of the kinetics of microstructural destruction of composite materials surfaces in the case of a complex stress state. The research objective. The increase in the reliability of the determination of the fracture nature of composite materials in the case of a complex stress state is based on the development of a model that takes into account the nature of the stress state of microelements, as well as the change in the amount of intact microelements in time until the sample is completely destroyed. The statement of basic materials. Theoretical study of the destruction of fibrous composite material in the case of a complex stressed state that corresponds to the transverse loading, which allows establishing the laws of its destruction in time, depending on the influence factors was conducted. Were obtained simulation results that allow estimating the distribution of strength and durability of composite material at each stage of its destruction. Conclusions. The developed model of destruction of composite material in the case of a complex stress state allows to estimate the nature of the destruction of the elements of multicomponent material in time, as well as to identify ways to increase strength, taking into consideration the current force loads on the sample.