Olena Mikulich

• ScD
• Professor at Lutsk National Technical University, Ukraine, Luts'k

The article presents the results of experimental studies of the effect of material anisotropy and the presence of tunnel inhomogeneity of 3D-printed elements relative to the direction of compression on the mechanical and strength characteristics of the obtained samples. Test samples made by 3D printing using PETG plastic were used for the research....

The paper examines the influence of loading modes on polyurethane foam elements on the change in mechanical properties of the material under load, resulting in plastic deformation of the material. Studies were carried out on polyurethane foam samples with different ratios of polyol and isocyanate in the foam-forming mixture. From the materials obta...

The article is devoted to developing a method for assessing the optimality of the mechanical characteristics of foam materials based on using the Cobb-Douglas model within the framework of Cosserat mechanics. The results of experimental studies for foamed polymer materials with closed cells were used for modeling. The Cobb-Douglas model used for mo...

The article is devoted to analyzing the dispersion properties of waves in structurally inhomogeneous materials such as foam. In analyzing the change of the wave propagation speeds in foam materials, the apparatus of the Cosserat was used. This approach allows us to account for the influence of shear-rotation deformations and analyze the dispersion...

The article is devoted to developing an analytical approach to studying wave propagation speeds in structurally inhomogeneous materials. Studies have been conducted on polymer foam materials with closed cells. The apparatus of the micropolar theory of elasticity, the Cosserat continuum, was used to analyze the wave propagation speeds change in foam...

The article analyzes the processes of attenuation of impulse loads in foam materials with closed-cell. In the framework of the couple stress elasticity, the analysis of the distribution of dynamic radial stresses in foam media with tunnel cavities of constant cross-section under the action of an impulse load of different duration applied to the cav...

This paper proposes the technique for the analysis of weak shock wave influence on the dynamic stress state of foam materials with negative and positive Poisson’s ratio. The investigation of the dynamic behavior of foam materials under the action of weak shock waves is performed in the framework of couple stress elasticity, where one can account fo...

The influence of impulse load applied for different duration on the distribution of normalised dynamic radial stresses in positive and negative Poisson’s ratio medium was investigated in this study. For solving the non-stationary problem in the case of plane deformation for structurally inhomogeneous materials, the model of Cosserat continuum was a...

The paper presents studies on the application of the boundary integral equation method for investigation of dynamic stress state of negative Poisson’s ratio foam media with tunnel cavity under the action non-stationary loads. In case of the plane problem, the distribution of normalized hoop and radial stresses were obtained for the action of non-st...

The paper presents studies on the application of the boundary integral equation method for investigation of dynamic stress state of foam media with tunnel cavities in Cosserat continuum. For the solution of the non-stationary problem, the Fourier transform for time variable was used. The potential representations of Fourier transform displacements...

The paper presents studies on the application of the boundary integral equation method for investigation of dynamic stresses in Cosserat continuum with constrained microrotations. For the solution of the non-stationary problem, the Fourier transform for time variable was used. The fundamental functions for the two-dimensional case of Cosserat conti...

Widespread use of foam materials in construction, which makes it possible to significantly reduce the cost and facilitate construction, caused increasing interest in the development of methods studying the stress state of such materials during action of various dynamic loads triggered by technological and mechanical influences. Research of transmis...

The dynamic stress state of the bodies considering the couple stresses using the Fourier transformation and method of integral equations has been investigated. The obtained results are in the agreement with the basic concepts of wave mechanics. The developed procedure allows one to investigate the non-stationary dynamic processes in synthetic mater...

This paper proposes the novel technique for analysis of dynamic stress state of multi-connected infinite plates under the action of weak shock waves. For solution of the problem it uses the integral and discrete Fourier transforms. Calculation of transformed dynamic stresses at the incisions of plates is held using the boundary-integral equation me...

This paper proposes the novel technique for analysis of dynamic stress state of multi-connected infinite plates under the action of oscillating forces. Calculation of dynamic stresses at the incisions of plates is held using the boundary-integral equation method and the theory of complex variable functions. The numerical implementation of the devel...