scholarly journals The deformability of the stress-strained concrete strips between the cracks during the short-term dynamic loading

2020 ◽  
Vol 315 ◽  
pp. 07002
Author(s):  
Zaur Galyautdinov ◽  
Oleg Kumpyak ◽  
Daud Galyautdinov
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Dynamic Loading ◽  
Experimental Research ◽  
Inclination Angle ◽  
Dynamic Load ◽  
Statistic Analysis ◽  
Theoretical Studies ◽  
Short Term ◽  
Experimental And Theoretical Studies

The formation of non-intersecting cracks in stress-strained ferroconcrete elements leads to separation of concrete strips between the cracks. The results of the experimental research indicate a significant decrease of the durability and deformability of the stress-strained concrete strips between cracks both under static and short-term dynamic loading. At the same time physico-mechanical properties depend on the straining deformations and rebars’ inclination angle towards the cracks. The existing theoretical and experimental results evaluate only the durability of the concrete strips between the cracks. The current paper presents the results of experimental and theoretical studies on the dynamic deformability of the stress-strained discs between the cracks. The statistic analysis of the experimental data is done; on the basis of the analysis we suggest the dependencies, characterizing the deformability of the concrete strips during the short-term dynamic load depending on the level of the straining deformations and rebars’ inclination angle towards the cracks.

scholarly journals Experimental and theoretical studies on heat and mass transfer in anti-condensation coatings

2011 ◽  
Vol 32 (3) ◽  
pp. 45-56 ◽  
Author(s):  
Andrzej Grzebielec ◽  
Artur Rusowicz
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Forced Convection ◽  
Experimental Research ◽  
Air Conditioning ◽  
Theoretical Studies ◽  
Favorable Conditions ◽  
Inclined Plates ◽  
Experimental And Theoretical Studies

Experimental and theoretical studies on heat and mass transfer in anti-condensation coatings Anti-condensation coatings are widely used in refrigeration, air conditioning and ships technology. They can store a certain amount of water in its own volume, and then return it back in favorable conditions. Anti-condensation coatings are used also to protect structures from the moisture. This paper presents the results of experimental research on heat and mass transfer in an anti-condensation coating under natural and forced convection. Experimental results are obtained for horizontal and inclined plates. Experimental data are compared with different models of computation.

A Study of Collagen Crimp Pattern in the Bovine Anterior and Posterior Medial Meniscal Horn Attachments

2007 ◽  
Author(s):  
Diego Villegas ◽  
William Dehlin ◽  
Tammy L. Haut Donahue
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Knee Joint ◽  
Tibial Plateau ◽  
Ultimate Strain ◽  
Theoretical Studies ◽  
Joint Lubrication ◽  
Meniscal Attachments ◽  
Experimental And Theoretical Studies ◽  
Femoral Condyles

Menisci are fibrocartilagenous structures located between the femoral condyles and tibial plateau that aid in joint lubrication and stability in the knee joint. Previous experimental and theoretical studies have shown that the meniscal horn attachments, which serve as the transition from mensical fibrocartilage into subchondral bone, are important for proper meniscal function [1–3]. Meniscal attachments did not show significant differences in surface mechanical properties such as ultimate strain or moduli, however, there were significant differences in overall behavior of the anterior versus posterior attachments [4]. No significant differences in creep or stress relaxation properties were found between the different meniscal attachments [5].

Research of Thermocouple Electrical Characteristics

2018 ◽  
Vol 938 ◽  
pp. 104-111 ◽  
Author(s):  
A.A. Abouellail ◽  
I.I. Obach ◽  
A.A. Soldatov ◽  
P.V. Sorokin ◽  
A.I. Soldatov
Keyword(s):  
Thermoelectric Power ◽  
Experimental Research ◽  
Experimental Measurements ◽  
Theoretical Studies ◽  
Electrical Characteristics ◽  
Parallel Connection ◽  
Power Sources ◽  
Experimental And Theoretical Studies

This paper presents the results of the experimental research on the electrical characteristics of two dissimilar thermoelectric power sources. Chromel-alumel and nichrome-constantan are the investigated types of thermocouples that are utilized as thermopower sources. Through the assistance of the collected data, experimental and theoretical studies of two equivalent thermopower sources are done. The first studied source is obtained by a parallel connection of the two types of thermocouples, and the second studied source is achieved by the parallel connection of two thermocouples of nichrome-constantan and a single thermocouple made of chromel-alumel. Theoretical studies of the two equivalent thermoelectric sources proved good repeatable precision of the studied results of experimental measurements.

scholarly journals The study of the ferroconcrete beams with thrust on the foil bearings during short-term dynamic loading

2020 ◽  
Vol 315 ◽  
pp. 07003
Author(s):  
Oleg Kumpyak ◽  
Daud Galyautdinov
Keyword(s):  
Dynamic Loading ◽  
Experimental Research ◽  
Fracture Strength ◽  
Considerable Increase ◽  
Intensity Increase ◽  
Short Term ◽  
Foil Bearings ◽  
Horizontal Shift ◽  
Power Intensity ◽  
Positive Effect

While designing and maintaining ferroconcrete beam constructions subjected to a short-term dynamic loading, it is necessary to consider the emergence of the thrust reaction; this leads to a considerable increase of durability and fracture strength. It is also necessary to consider the use of foil bearings as the power-intensity increase of the researched constructions. The aim of the experimental research is to expose the reasonability of using foil bearings in thrust constructions. The paper presents the results of the experimental research of ferroconcrete beam constructions with thrust on foil bearings during short-term dynamic loading. The influence of the thrust on the durability, deformability and fracture strength of ferroconcrete constructions during short-term dynamic loading, as well as joint use of foil bearings and limitation of support contour horizontal shift are studied. The results of the research indicate the positive effect of using foil bearings in the constructions with thrust.

scholarly journals Mechanical properties of composite rebar under static and short-term dynamic loading

2017 ◽  
Author(s):  
Vasilii Plevkov ◽  
Igor Baldin ◽  
Konstantin Kudyakov ◽  
Andrei Nevskii
Keyword(s):  
Mechanical Properties ◽  
Dynamic Loading ◽  
Short Term

Numerical Simulation and Experimental Research on Fatigue Strength of the Injector Guide Pillar under Complex Loads

2010 ◽  
Vol 118-120 ◽  
pp. 196-200
Author(s):  
Jin Guo Li ◽  
Xiao Gui Wang ◽  
Zeng Liang Gao
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Numerical Analysis ◽  
Experimental Research ◽  
Contact Surface ◽  
Electronic Measurement

Under the complex loads, the injector guide pillar (IGP) used in injection machine was failure only after 1.5-year-service. In order to determine the cause of the fracture, the numerical simulation technology was applied to analyze the mechanical properties of the IGP. The contact between the mating surfaces of the clamping mechanism was modeled; nonlinear multi-region contact of surface-surface was applied to establish the contact model of FEA. The constraint of tie was used for modeling thread joint. The simulated results indicated that the smaller area of contact surface, the higher value of stress in the neck of IGP. Electronic measurement was also used to check the results of stress in IGP obtained by FEA. It was found that the experimental data agreed well with simulated results. Based on the numerical analysis and experimental study, the structure of IGP was improved by adopting a smoother double-round neck. The fatigue life of the improved structure was longer than that of the original machine.

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