Darya Z. The two-level method of the research of stress concentration in composite plates with holes

Object of research: the strength of composite plates with holes under the conditions of macro and microstress concentration. The aim of the study: enhancements of the methods and models of the analysis of the elastic properties of composite materials and determination of macro and micro concentrations for hole weakened reinforced plates. Methods of investigation: complex variable function method, finite element method, and strain gauging method. Theoretical and practical results: development of the methods of defining the elastic constant properties of the strength of reinforced fiber composites. Scientific novelty: methods for the numerical solution of the problem of the stress analysis of a composite representative cell were developed; models for the determination of stress distribution in an orthotropic plate with holes were enhanced. Degree of implementation: the results were implemented in the course of the execution of the European grant "Innovative Nondestructive Testing and Advanced Composite Repair of Pipelines with Volumetric Surface Defects" No. PIRSES-GA-2012-318874 within the 7th framework program of the European Union at the NTU "KhPI". Application area: design and manufacturing of the assembly components of aeronautical structures and other modern structures of composite materials.