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- Composite Materials and Structures, Materials Science, Composites, Computational Mechanics, Parallel Computing, Mathematical Modelling, and 14 moreComputational Materials Science, Finite Elements, Stochastic Mechanics, Statistical Mechanics, Plasticity, Elasticity (Solid Mechanics), Composite Materials, Nondestructive testing, Aircraft Vibrations, Mechanical Engineering, Engineering, Renewable Energy, Nanotechnology, and International Relationsedit
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This work is devoted to development and application of the statistical mechanics approaches to studying microstructural behavior of multi-component composites. The object of the study is heterogeneous materials consisting of more than two... more
This work is devoted to development and application of the statistical mechanics approaches to studying microstructural behavior of multi-component composites. The object of the study is heterogeneous materials consisting of more than two components. The aim is to develop analytical tools for the analysis of the microstructural stress and strain fields in multicomponent media taking into account geometrical and mechanical properties of components and basied on calculation of the statistical characteristics of the local fields of stress and strain in components. Research of the microstructure behavior of components of composites is based on the concept of representative volume elements. It is assumed that the components are homogeneous and isotropic. Information about the internal morphology of the representative volume is formalized by means of correlation functions of various orders. Characteristics of the deformation processes are the statistical moments (statistics) of stress and...
The problem of calculation of stress and strain fields in 3D matrix composites is considered. Random structure of composites is described with set of multipoint moment functions. Boundary-value problem is reduced to integral-differential... more
The problem of calculation of stress and strain fields in 3D matrix composites is considered. Random structure of composites is described with set of multipoint moment functions. Boundary-value problem is reduced to integral-differential equation, which is solved in the second approximation. The method of obtaining of analytical expressions for stress and strain fields statistical characteristics is presented.
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This study is focused on the deformation behaviour of composites formed by auxetic lattice structures acting as a matrix based on the re-entrant unit-cell geometry with a soft filler, motivated by biomedical applications.... more
This study is focused on the deformation behaviour of composites formed by auxetic lattice structures acting as a matrix based on the re-entrant unit-cell geometry with a soft filler, motivated by biomedical applications. Three-dimensional models of two types of the auxetic-lattice structures were manufactured using filament deposition modelling. Numerical finite-element models were developed for computational analysis of the effect of the filler with different mechanical properties on the effective Poisson’s ratio and mechanical behaviour of such composites. Tensile tests of 3D-printed auxetic samples were performed with strain measurements using digital image correlation. The use of the filler phase with various elastic moduli resulted in positive, negative, and close-to-zero effective Poisson’s ratios. Two approaches for numerical measurement of the Poisson’s ratio were used. The failure probability of the two-phase composites with auxetic structure depending on the filler stiffn...
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Abstract This paper presents results of numerical investigation of the specifics of elastoplastic deformation and damage accumulation in representative volume elements (RVEs) of open-cell and closed-cell porous metal materials under... more
Abstract This paper presents results of numerical investigation of the specifics of elastoplastic deformation and damage accumulation in representative volume elements (RVEs) of open-cell and closed-cell porous metal materials under tensile and compressive loads. The Johnson–Cook model was used to describe the elastoplastic behavior and fracture of the aluminum matrix material. Fracture propagation in RVEs of porous media needs to be modeled with explicit consideration for morphological parameters of the internal structure. This feature can be used to form structures with tailored mechanical response using recent advances in additive manufacturing technologies. These technologies, also referred to as 3D printing, provide a free choice of topology by using predetermined digital models that can be optimized before being implemented as real objects. This leads to a task of estimation of the effect of controlled topology on the mechanical behavior of the designed porous structures. The obtained results demonstrate the effect of variation of morphological properties on the elastoplastic behavior and fracture of bicontinuous metal structures under tensile and compressive loads.
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The possibilities of strain measurements in composite structures using optical fiber strain sensors based on Bragg gratings are demonstrated. Specifics of interaction of the sensors with the environment were considered. Indications of... more
The possibilities of strain measurements in composite structures using optical fiber strain sensors based on Bragg gratings are demonstrated. Specifics of interaction of the sensors with the environment were considered. Indications of optical fiber sensors can be used to predict mechanical behavior of composites structures as well as internal defects development based on numerical models. An approach to numerical modeling for identification of the most critical zones in terms of the appearance and development of delamination defects in polymer composite structures is proposed. Computational results for the case studies are presented.
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Abstract Heterogeneous materials with bicontinuous foam-like structure were investigated. The aim of the work was to create models of failure of representative volume elements (RVEs) of such materials and to reveal the dependencies of the... more
Abstract Heterogeneous materials with bicontinuous foam-like structure were investigated. The aim of the work was to create models of failure of representative volume elements (RVEs) of such materials and to reveal the dependencies of the character of failure processes on the structural morphology peculiarities. To create models of RVEs with open-cell interpenetrating structures, approaches based on the analytical determination of surfaces separating the two phases were used. Mechanical modeling was performed with the finite element analysis using properties degradation and element removal techniques. The modelling results obtained for high-dense aluminum foam materials are presented. The influence of the size of representative volume element and its volume fraction on the fracture process has been studied.
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The effect of short carbon fiber (SCF) filler on the mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS) was investigated. The fused filament fabrication (FFF) method was used for the manufacturing of samples.... more
The effect of short carbon fiber (SCF) filler on the mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS) was investigated. The fused filament fabrication (FFF) method was used for the manufacturing of samples. Elastic properties and strength characteristics of samples made of conventional ABS and SCF-reinforced ABS were compared in tensile and bending tests. Fracture toughness and critical strain energy release rate were also determined. In addition, 3D-printed monofilament SCF-reinforced samples were fabricated, the internal structure of which was analyzed using microcomputed tomography (micro-CT). Based on the tomography data, finite-element (FE) models of representative volume elements (RVEs) of the reinforced material were created and used for the numerical calculation of effective characteristics. Numerical and experimental results for the effective elastic properties were compared with the Mori-Tanaka homogenization technique. The ABS samples filled with ...
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The mechanical behavior of gradient lattice structures whose geometry is based on the analytic definition of three-dimensional triply periodic minimal surfaces (TPMS) is investigated. Several homogeneous and gradient lattice models with... more
The mechanical behavior of gradient lattice structures whose geometry is based on the analytic definition of three-dimensional triply periodic minimal surfaces (TPMS) is investigated. Several homogeneous and gradient lattice models with different types of representative volume geometry and gradient parameters are considered. The numerical models are validated with data obtained experimentally using the Vic-3D video system. The results of numerical simulation of the deformation behaviour of gradient structures with the Shoen G (gyroid) TPMP geometry under uniaxial compression are presented. The influence of structure parameters and gradient properties on the mechanical behaviour is studied.
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A classic problem in prognostic and health management (PHM) is the prediction of the remaining useful life (RUL). However, until now, there has been no algorithm presented to achieve perfect performance in this challenge. This study... more
A classic problem in prognostic and health management (PHM) is the prediction of the remaining useful life (RUL). However, until now, there has been no algorithm presented to achieve perfect performance in this challenge. This study implements a less explored approach: binary classification of the state of mechanical systems at a given forecast horizon. To prove the effectiveness of the proposed approach, tests were conducted on the C-MAPSS sample dataset. The obtained results demonstrate the achievement of an almost maximal performance threshold. The explainability of artificial intelligence (XAI) using the SHAP (Shapley Additive Explanations) feature contribution estimation method for classification models trained on data with and without a sliding window technique is also investigated.
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This work presents the results of an experimental investigation of the mechanical properties of polyetheretherketone (PEEK) specimens additively manufactured (AM) by using fused filament fabrication with different printing parameters and... more
This work presents the results of an experimental investigation of the mechanical properties of polyetheretherketone (PEEK) specimens additively manufactured (AM) by using fused filament fabrication with different printing parameters and subjected to postprocessing heat treatment. Standard and compact tension samples were manufactured with a different infill angle using 0.4 mm and 0.6 mm nozzle diameters. Some of the samples were subjected to heat treatment at 220 °C after manufacturing. Tensile tests were conducted to determine the values of elastic modulus, tensile strength, as well as mode-I fracture toughness and critical strain energy release rate. Tensile properties of single-thread and as-delivered filaments were also studied. It was concluded that heat treatment significantly improved the elastic properties, tensile strength and fracture toughness of the AM PEEK samples: the fracture resistance increased by 33 to 45% depending on the stacking order, while the tensile strengt...
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Heightened requirements for energy efficiency, reliability and safety of modern aircrafts encourage manufacturers to focus their efforts on technologies, which can considerably reduce the weight of structural components without detriment... more
Heightened requirements for energy efficiency, reliability and safety of modern aircrafts encourage manufacturers to focus their efforts on technologies, which can considerably reduce the weight of structural components without detriment to their reliability and strength. In this context, over the past decades the aircraft industry has significantly expanded the scope of composite materials, including polymer-based composites. However, one of the factors restricting the application of composites in this area is a rather high sensitivity of these materials to microstructure damage including delamination, fibre rupture, fluid absorption, impact damage, matrix fracture, decrease in strength and stiffness at high temperatures, etc., produced by operational factors. The aim of this work is to develop mathematical models of nonlinear deformation, accumulation of damage and structural failure of composite materials under dynamic loading, taking into account peculiarities of microstructure ...
Research Interests: Materials Science and ECF
The aim of this work is research of statistical characteristics of structural stress and strain fields in composites with random polydisperse structure basing on developing of elasticity theory stochastic boundary value problem solution... more
The aim of this work is research of statistical characteristics of structural stress and strain fields in composites with random polydisperse structure basing on developing of elasticity theory stochastic boundary value problem solution methods. Matrix composites with spherical inclusions are considered, stochastic structure of which is described with set of multipoint correlation functions of different order. Explicit forms of these functions are obtained for the realizations of synthesized 3D models of composite structure. Statistical characteristics of structural stress and strain fields in the components are determined from boundary value problem solution, equations and boundary conditions of which contain stochastic variables. In our work we develop methods of obtaining of high order approximations for the boundary value problem, where correlation functions and moments of higher order are used. New analytical expressions for average values and dispersions of stress and strain f...
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The aim of this work is research of statistical characteristics of structural stress and strain fields in composites with random structure on a base of developing of elasticity theory stochastic boundary value problem solution methods.... more
The aim of this work is research of statistical characteristics of structural stress and strain fields in composites with random structure on a base of developing of elasticity theory stochastic boundary value problem solution methods. Stochastic structure of composite is described with multipoint correlation functions, which are obtained for the realizations of synthesized 3D structure models with real materials characteristics specified. Statistical characteristics of structural stress and strain fields in the components are determined from boundary value problem solution, equations and boundary conditions of which contain stochastic variables. New analytical expressions for average values and dispersions of stress and strain fields in components of material with numerical results for simple shear case of macroscopic state of strain are presented.