Weakened Zones in Wood – Based Composite Beams and Their Strengthening by CFRP: Experimental, Theoretical, and Numerical AnalysisKrzysztof KULA, Tomasz SOCHA & Arkadiusz DENISIEWICZ
This paper looks at the mechanical behaviour of wood-based beams. Laboratory tests of an I-beam show a considerable decrease of capacity in the weakened zones, e.g., at the connection between two pieces of pine wood used as a flange. We propose strengthening of the zones using fibre composite tapes based on CFRP. This article demonstrates the way for protection of the I-beam with defects in the bottom flange against the loss of load-carrying capacity. The...
Intracystic fluid pressure is discussed as a potentially important factor influencing a bone cyst growth. This process can develop in the course of months. However, the exact mechanism remains speculative. In this paper, we use an established mathematical model to evaluate whether the presence of pressurized fluid in bone cavities may result in cyst growth. A continuous function of bone density rate vs. mechanical stimulus is used. The numerical model of the mandible with the...
A mixed finite element formulation is developed for the general 2D plane strain, linear isotropic gradient elasticity problem. Form II of the dipolar strain gradient theory for micro-structured solids is considered. The main variables are the double stress tensor μ and the displacement field vector u. Standard C0−continuous, high polynomial order hierarchical basis functions are employed for the finite element solution spaces (p-extension). The formulation is numerically validated against the standard axial tension patch test...
The paper describes a computer analysis of the pull-out test used to determine the force needed to pull out a fragment of rock and the shape of this broken fragment. The analyzed material is sandstone and porphyry. The analysis included a comparison of different methods of propagation of cracks in the Abaqus computer program using the Finite Element Method. The work also contains a description of laboratory tests and analytical considerations.
Fast GPU simulation of reinforced concrete at the scale of reinforcement ribs by the discrete element methodB. Berisha, S. Hirsiger, H. Hippke, P. Hora, A. Mariaux, D. Leyvraz & C. Bezençon
Modeling of anisotropic behavior as well as hardening behavior based on micromechanical quantities in combination with a spectral solver is the focus of this study. A deep drawing steel as well as two different aluminum alloys are investigated. Prediction capabilities of the proposed modeling strategy are discussed and the benefits of the micromechanical model are highlighted. Further, a comparison of the crystal plasticity (CP) results with the well established macroscopic model YLD2000-2d underlines the importance...
Use of the higher-order plate theory of I. N. Vekua type in problems of dynamics of heterogeneous plane waveguidesO.V. Egorova, L.N. Rabinskiy & S.I. Zhavoronok
The dynamics of elastic plane waveguides is studied on the basis of the extended formulation of the plate theory of N^th order. The plate model is based on the Lagrangian formalism of analytical dynamics combined with the dimensional reduction approach and the biorthogonal expansion of the spatial distribution of the displacement. The boundary conditions shifted from the faces onto the base plane are interpreted as constraints for the variational formulation of two-dimensional plate models. The...
Morphogenetic structure of marsh frog populations of Pelophylax ridibundus (Amphibia, Anura) under conditions of urban environmentE.A. Snegin & A.S. Barkhatov
On the basis of morphometric, phenetic and molecular genetic methods, the population structure of the Pelophylax ridibundus inhabiting the urbanized environment of Belgorod and its environs (Russia) was studied. The obtained results confirmed the previously stated assumptions, according to which under the conditions of anthropogenic load the color morph “striata” dominates (the proportion of individuals on impact territories was 70 to 93%). In relatively pure biotopes, the color morph “maculate” prevailed (58–67%). The morphometric characteristics...
The possibility of reducing the toxicity of gaseous emissions of power plants by the effect of an electrostatic field on the organic fuel combustion zoneI.A. Zyryanov, A.P. Pozolotin, A.G. Budin & E.V. Kantor
Electric power generation based on combustion of organic fuel is one of the largest sources of air pollution by toxic substances, including products of incomplete combustion. To reduce the negative impact of power plants on the environment, various methods are used to optimize the regimes for burning fuel and cleaning the emissions of combustion products into the atmosphere. One of the promising ways to regulate the combustion of fuels in order to reduce emissions is...
Microbial transformation of organic matter of sod-podzolic soils in the Pre-Urals under conditions of different use and application of mineral fertilizersN.E. Zavyalova, I.G. Shirokikh, A.I. Kosolapova & A.A. Shirokikh
Microbiological parameters and character of transformation of humic substances of sod-podzolic soil at the end of five rotations of eight-full crop rotation in long-term stationary field experiment (1978–2017) are investigated. The direction of microbiological processes due to the effect of long-term application of mineral fertilizers in increasing doses – 30 to 150 kg/ha of NPK was determined. A comparison of the arable soil with its virgin analogs (mixed forest and natural meadow) as well as...
Ecology is a science dealing with relations of living organisms with the environment and the ways of sustaining the harmonious balance in the world. Ecological approach determines the attitude of the people to the environment, it is the basis of their worldview, their behavior and culture. Ecologically oriented economy management and human behavior mean tendency of the mankind to nature preserving and keeping their environment healthy. Using ethnocultural experience helps to save financial, human, and...
Vyatka State University22
Institute of Biology of Komi Scientific Centre21
University of Beira Interior7
University of Lisbon5
Federal Agrarian Scientific Center of the North-East named after NV Rudnitsky5
Vyatka State Agricultural Academy5
Poznań University of Technology4
Fluminense Federal University4
Universidade Nova de Lisboa4
Universidade Federal da Integração Latino-Americana3