Experimental Study and Mathematical Modeling of Bond of Different Types Winding Glass-Plastic Reinforcement with Concrete

2014 ◽  
Vol 617 ◽  
pp. 215-220 ◽  
Author(s):  
Andrey Benin ◽  
Galina Bogdanova ◽  
Sergey Semenov
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Experimental Study ◽  
Deformation Process ◽  
Experimental Studies ◽  
Glass Plastic ◽  
Fiber Plastic ◽  
Different Types ◽  
Bond Characteristics ◽  
Composite Reinforcement

The experimental studies of flat and relief glass-plastic reinforcement bond with concrete were conducted. The comparative analysis of obtained experimental data with results of other researchers in field of reinforcement and concrete bond was made. It was identified that composite reinforcement with flat winding has better bond characteristics in comparison with steel reinforcement and other winding types composite reinforcement. The analytical dependencies, allowing to simulate the process of fiber-plastic reinforcement bond with concrete, were obtained. The finite element modeling of deformation process of concrete foundation of transport constructions with fiber-plastic reinforcement were made.

Kinetics of hypso anhydrites dissolution in water. Experimental studies

2019 ◽  
pp. 93-96
Author(s):  
A. L. Lebedev ◽  
I. V. Avilina
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Riccati Equation ◽  
Balance Equation ◽  
Experimental Studies ◽  
Common Ion ◽  
The Common ◽  
Common Ion Effect ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

Experimental study of kinetics of dissolution of hypso anhydrites at 25 ᵒC made it possible to formulate model of the process in the form of a balance equation for the kinetics of dissolution of gypsum, anhydrite (first and second orders, respectively) and kinetics of precipitation of gypsum (second order). The processing of the experimental data were carried out on the basis of the solution of the Riccati equation. When taking into account the common-ion effect on the solubility of gypsum and anhydrite, the calculated values turned out to be more comparable with the experimental ones.

Experimental Study on Bearing Properties of Self-Compacting Prestressed Concrete Beams

2010 ◽  
Vol 163-167 ◽  
pp. 918-927
Author(s):  
Wei Liu ◽  
Zhen Fu Chen
Keyword(s):  
Experimental Study ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Flexural Members ◽  
Different Types

Five different types of self-compacting unbonded prestressed concrete beams are designed to study the bearing properties of self-compacting prestressed concrete flexural members. And experimental studies are conducted on their cracking loads, flexural strengths, ductility of members and failure forms. The testing results provide references for design and establishing related codes of self-compacting prestressed concrete structures.

scholarly journals Wear Processes in a Mechanical Friction Clutch: Theoretical, Numerical, and Experimental Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-28 ◽  
Author(s):  
Dariusz Grzelczyk ◽  
Jan Awrejcewicz
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Numerical Analysis ◽  
Numerical Simulations ◽  
Experimental Studies ◽  
Friction Torque ◽  
Wear Properties ◽  
Wear Model ◽  
Differential Model ◽  
Friction Clutch

Mathematical modeling, theoretical/numerical analysis, and experimental verification of wear processes occurring on the contact surface of friction linings of a mechanical friction clutch are studied. In contrast to many earlier papers we take into consideration wear properties and flexibility of friction materials being in friction contact. During mathematical modeling and numerical simulations we consider a general nonlinear differential model of wear (differential wear model) and a model of wear in the integral form (integral wear model). Equations governing contact pressure and wear distributions of individual friction linings, decrease of distance between clutch shields, and friction torque transmitted by the clutch are derived and compared with experimental data. Both analytical and numerical analyses are carried out with the qualitative and quantitative theories of differential and integral equations, including the Laplace transform approach to ODEs. We show that theoretical results and numerical simulations agree with the experimental data. Finally, a numerical analysis of the proposed mathematical models was carried out in a wider range of parameters of the considered system.

Mathematical Modeling and Experimental Study on Electrochemical Deburring of Miniature Holes

2013 ◽  
Vol 721 ◽  
pp. 382-386 ◽  
Author(s):  
Ze Fei Wei ◽  
Xing Hua Zheng ◽  
Zi Yuan Yu
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Mathematical Model ◽  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Electrochemical Machining ◽  
Current Density Distribution ◽  
Element Analysis ◽  
The Finite Element Analysis

The paper mainly focused on burr removal of the miniature hole drilled on aluminum plate by electrochemical machining. A mathematical model for the electrochemical deburring of miniature holes (M-ECD) was established based on the finite element analysis to the current density distribution. Both theoretical analysis and experimental study were held on the effects of many factors to the deburring results. The results proved that predictions based on our mathematical model were agreed with the experimental data comparatively.

scholarly journals EXPERIMENTAL RESEARCH METHODOLOGY OF ELEMENTS WITH COMPOSITE FITTINGS WITH BENDING AT PRIORITY SECTIONS

2020 ◽  
Vol 5 (9) ◽  
pp. 8-14
Author(s):  
S. Merkulov ◽  
E. Akimov
Keyword(s):  
Experimental Study ◽  
Crack Resistance ◽  
Experimental Research ◽  
Research Methodology ◽  
Experimental Studies ◽  
Strain Condition ◽  
Joint Operation ◽  
Composite Rod ◽  
Concrete Elements ◽  
Composite Reinforcement

The inability of using this type of reinforcement as a cross on the support sections of the bent elements is one of the reasons limiting the wide use of composite rod reinforcement. To ensure the strength of bent elements along inclined sections, it is proposed to bend the rods of the working longitudinal working reinforcement, and geometric parameters of bends for some types of composite reinforcement are proposed, depending on the diameter of the rod. To develop a method for calculating the strength of inclined sections, it is necessary to develop experimentally justified prerequisites that take into account the features of joint operation of composite rod reinforcement in inclined sections. The article offers a method for experimental study of the strength and crack resistance of reinforced concrete bending elements with non-metallic composite rod reinforcement, including the design of prototypes, the installation scheme of devices during testing. The developed method allows to determine the parameters of strength and crack resistance of inclined sections of bent elements. The tasks of experimental studies of concrete elements reinforced with composite rod reinforcement are to determine the regularity of changes in the stress-strain condition of concrete and composite reinforcement during loading, to determine the nature of the destruction of elements along the inclined section, to obtain data on the strength and crack resistance of elements.

Computational and experimental study of the stress state of the connecting rod of the opposed compressor to assess the probability of failure-free operation

2020 ◽  
Vol 86 (5) ◽  
pp. 52-58
Author(s):  
I. M. Petrova ◽  
M. A. Filimonov
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Stress State ◽  
Numerical Experiment ◽  
Field Experiments ◽  
Fatigue Cracks ◽  
Tangential Force ◽  
Experimental Studies ◽  
Connecting Rod ◽  
Comparison Of The Results

Fatigue cracks in the piston heads of the connecting rods of opposed compressors can occasionally develop in service. A study of the loading of the connecting rods of the compressors operating in chemical production was carried out to assess the probability of their failure-free operation. Since the experimental study of stresses acting in large structural elements is rather difficult, the study of the stress state was carried out using computational methods with subsequent comparison of the results with the experimental data. When loading the connecting rod, there is an area affected by the distributed load and another area with a gap between the cylindrical surfaces where the contact pressure is absent. The forces acting on the boundary of the contact areas and the gap of the finger with the connecting rod bore are determined: the radial force N, tangential force Q and bending moment M. N and Q are considered functions of the contact angle α. Using numerical experiments, we determined the stresses in the zone from the angle α corresponding to the end of the contact zone to the angle of transition of the head in the shank of connecting rod in conditions of varied operational loads and gaps in the connecting rod — finger coupling. The values and character of changes in the loads affecting the crank mechanism of the compressor during operation are determined experimentally. The distribution of stresses in the sections of the connecting rod and the most loaded cross-sections are specified. the results of the numerical experiment are compared with the experimental data. Comparison of the results of numerical and field experiments has shown that the numerical experiment provides the similar assessment of the stress distribution, moreover, the numerical experiment allows us to estimate the simultaneous effect of both loads and gaps on the stress growth which is almost impossible to be determined by experimental studies.

The Study of the Synchronization Process in the Gearbox with Automatic Control

2015 ◽  
Vol 763 ◽  
pp. 71-77 ◽  
Author(s):  
Aleksandr Blokhin ◽  
Elena Denisenko ◽  
Abram Kropp ◽  
Arcady Nedialkov
Keyword(s):  
Experimental Data ◽  
Automatic Control ◽  
Constant Pressure ◽  
Experimental Studies ◽  
Pneumatic Cylinder ◽  
Synchronization Process ◽  
Synchronization Time ◽  
Multi Stage ◽  
Different Types ◽  
Air Discharge

The paper presents theoretical dependences to calculate the main parameters of the pneumatic actuator of the multi-stage manually synchronized transmission depending on the parameters of the engine, the transmission and conditions of running resistance during the synchronization process at alternating pressure with different types of the air discharge into the pneumatic cylinder: critical, subcritical and at constant pressure. Comparison of results theoretical and experimental studies on the test stand shows that the calculated values of synchronization time on certain stages and throughout the cycles of the transmission shifting differ from the experimental data by 10-25% maximum.

scholarly journals Experimental studies of the method of mutual load of induction motors

2020 ◽  
pp. 44-49
Author(s):  
V. V. Kharlamov ◽  
◽  
D. I. Popov ◽  
P. S. Sokolov ◽  
L. E. Serkova ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Mathematical Model ◽  
Induction Motors ◽  
Experimental Studies ◽  
Electromechanical System ◽  
Experimental Equipment ◽  
Frequency Converters ◽  
Parameter Values ◽  
The Mathematical Model

The article presents the results of comparison of experimental studies and mathematical modeling of the stand for testing induction motors by the method of mutual load. A detailed description of the composition of the experimental equipment, which is based on a pair of frequency converters and connected to them a pair of engines of the АИС71В4 type with a nominal power of 0,75 kW, the shafts of which are rigidly connected by a coupling. The mathematical model of the electromechanical system used in the calculations is presented, and its main assumptions are listed. A table of parameter values and graphs obtained from calculated and experimental data are presented. The analysis of the obtained data shows the possibility of using the considered mathematical model with the existing assumptions in the design of electrical complexes intended for testing induction motors by the method of mutual load

Convection Heat Transfer From Broad Leaves of Plants

1968 ◽  
Vol 90 (1) ◽  
pp. 71-76 ◽  
Author(s):  
D. F. Parkhurst ◽  
P. R. Duncan ◽  
D. M. Gates ◽  
F. Kreith
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Gravitational Force ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Leaf Position ◽  
Empirical Relations ◽  
Different Types ◽  
Free And Forced Convection

This article presents the results of an experimental study designed to determine quantitatively the rates of heat transfer by convection from broad leaves of various plants and trees under conditions approximating those in an ecosystem in nature. Empirical relations, applicable to the different types of leaf shapes found in nature, are derived from the experimental data for free and forced convection. The influences of leaf position relative to the wind or the direction of the gravitational force field, the presence of other branches or leaves in the vicinity, and the flutter in the wind also have been investigated.

Experimental studies and modeling on concentration polarization in forward osmosis

2010 ◽  
Vol 61 (11) ◽  
pp. 2897-2904 ◽  
Author(s):  
Jian-Jun Qin ◽  
Sijie Chen ◽  
Maung Htun Oo ◽  
Kiran A Kekre ◽  
Emile R. Cornelissen ◽  
...  
Keyword(s):  
Experimental Data ◽  
Concentration Polarization ◽  
Water Flux ◽  
Forward Osmosis ◽  
Experimental Studies ◽  
Individual Contribution ◽  
Pilot Studies ◽  
Draw Solution ◽  
Different Types ◽  
Selection Of

Concentration polarization (CP) is an important issue in forward osmosis (FO) processes and it is believed that the coupled effect of dilutive internal CP (DICP) and concentrative external CP (CECP) limits FO flux. The objective of this study was to distinguish individual contribution of different types of DICP and CECP via modeling and to validate it by pilot studies. The influence of DICP/CECP on FO flux has been investigated in this study. The CP model presented in this work was derived from a previous study and evaluated by bench-scale FO experiments. Experiments were conducted with drinking water as the feed and NaCl/MgSO4 as draw solutions at different concentrations and velocities. Modeling results indicated that DICP contributed to a flux reduction by 99.9% for 0.5 M NaCl as a draw solution although the flow pattern of both feed and draw solutions was turbulent. DICP could be improved via selection of the draw solution. The modeling results were well fit with the experimental data. It was concluded that the model could be used for selection of the draw solution and prediction of water flux under similar situation. A draw solution with greater diffusion coefficient or a thinner substrate of an asymmetric FO membrane resulted in a higher flux.

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