scholarly journals Heat Curing Performance of Cold-Weather Concrete using Induction Heating Technology

2020 ◽  
Vol 20 (6) ◽  
pp. 23-30
Author(s):  
Jinbok Lee ◽  
Kyeongtack Kim ◽  
Jinsoo Choi ◽  
Chi-Hyung Ahn ◽  
Hyun-Oh Shin
Keyword(s):  
Cross Section ◽  
Induction Heating ◽  
Electromagnetic Compatibility ◽  
Cold Weather ◽  
Magnetic Flux Density ◽  
Heating Process ◽  
Test Results ◽  
Concrete Mixtures ◽  
Heat Curing ◽  
Heating Technology

In this study, we evaluated the heat curing performance of cold-weather concrete using the induction heating technology. Specifically, we studied the effects of the size and shape of steel forms as well as different concrete mixtures on the heat curing performance. The test results showed that increasing the cross-section of concrete reduced the homogeneity of temperature distribution throughout it. This problem can be compensated for by adding more conductive materials in the concrete cross-section. The concrete specimens that were cured using induction heating achieved a satisfactory early age strength even though they were stored in a 0 °C low-temperature chamber. Furthermore, we evaluated the electromagnetic compatibility (EMC) of the induction heating process and the magnetic flux density of 13.9 µT thus obtained satisfied the EMC requirement.

Finite element analysis and experiment on induction heating process of slab continuous casting-direct rolling

2019 ◽  
Vol 116 (4) ◽  
pp. 403
Author(s):  
Chao Yu ◽  
Hong Xiao ◽  
Zi-chen Qi ◽  
Yun-peng Zhao
Keyword(s):  
Finite Element ◽  
Continuous Casting ◽  
Induction Heating ◽  
Heating Process ◽  
Element Analysis ◽  
Actual Production ◽  
Heating Surfaces ◽  
Direct Rolling ◽  
Heating Technology ◽  
Moving Speed

To reduce the energy consumption of reheating billets between the continuous casting and hot rolling processes, the continuous casting-direct rolling (CC-DR) process is developed, of which one of the key technologies in CC-DR is compensative heating between the processes. Considering the compensative heating technology requirements in the actual production of slab CC-DR, the finite element models of longitudinal flux induction heating (LFIH) and transverse flux induction heating (TFIH) are established to analyse the slab heating process. The results show that LFIH is good for heating surfaces of the slab, but cannot solve the problem of low temperature on the edges, which can effectively be heated with TFIH. The temperature distribution of the slab can be made more uniform by choosing the appropriate current and moving speed. Besides, induction-heating prototypes are developed to inspect the effect of induction heating. The measured results are consistent with the simulated ones. The results of the analysis have direct significance on the induction heating process in the actual production of slab CC-DRs.

scholarly journals Simulation of induction heating technology for the production of seamless large diameter tees

2018 ◽  
Vol 245 ◽  
pp. 04002
Author(s):  
Iurii Murashov ◽  
Vyacheslav Shestakov ◽  
Vladimir Skornyakov ◽  
Irina Savelieva
Keyword(s):  
Mathematical Model ◽  
Induction Heating ◽  
Cooling System ◽  
Large Diameter ◽  
Experimental Studies ◽  
Spiral Inductor ◽  
Heating Process ◽  
Operating Modes ◽  
Flat Spiral ◽  
Heating Technology

The article is dedicated to nonstationary simulation of induction heating technology for the production of seamless large diameter tees. A mathematical model of induction heating process representing a multi-physical (heat transfer and electromagnetism) task for technology of tees production is developed. Numerical simulation was carried out for a flat spiral inductor. The developed model was verified according to the results of experimental studies. The hydrodynamic 3D mathematical model is developed for the design of the inductor cooling system. Optimal operating modes are determined by simulation results and confirmed by experimental data. The calculation results are presented for pipes with wall thicknesses: 15 mm, 40 mm, 60 mm, 70 mm.

Numerical analysis and experimental research of triangle induction heating of the rolled plate

2016 ◽  
Vol 231 (5) ◽  
pp. 844-859 ◽  
Author(s):  
Xuebiao Zhang ◽  
Cheng Chen ◽  
Yujun Liu
Keyword(s):  
Numerical Model ◽  
Induction Heating ◽  
Electromagnetic Coupling ◽  
Element Model ◽  
Rolled Plate ◽  
Heating Process ◽  
Forming Process ◽  
Plate Edge ◽  
Modified Model ◽  
Heating Technology

In shipyard, triangle heating technology with irregular multi-heating paths and highly concentrated heat input is used to form a curved plate, especially a concave type plate. Compared with line heating process with simple line segment path, its main purpose is to get a bigger contraction deformation at the plate edge. Hence, triangle heating technology is important for most shipyards to increase hull-forming productivity and study the automation. This paper focuses on the moveable triangle induction heating technology. An electromagnetic coupling finite element model is built to simulate the moveable triangle induction heating process and reveal the temperature characteristics and deformation behavior. The results of the simulation are compared with those obtained from experiments and show good agreement. It demonstrates that the numerical model used in this study is effective for simulating triangle heating for the steel plate forming process in shipbuilding. With the numerical model, the paper further investigates the effect of heating parameters on temperature and shrinkage deformation. These are traced here with a modified mechanical model whose results are in accord with the numerical results. This modified model can be applied to predict the edge shrinkage and explain the effect of heating parameters on transverse shrinkage.

The Numerical Study of Steel Plate Forming by Moveable Induction Heating Considering the Plate Edge Shrinkage

2017 ◽  
Vol 33 (02) ◽  
pp. 166-177
Author(s):  
Xuebiao Zhang ◽  
Cheng Chen ◽  
Jiaqin Li ◽  
Yujun Liu
Keyword(s):  
Induction Heating ◽  
Steel Plate ◽  
Numerical Study ◽  
Electromagnetic Coupling ◽  
Element Model ◽  
Heating Process ◽  
Plate Edge ◽  
Forming Technology ◽  
Heating Technology ◽  
Transverse Shrinkage

In this article, the line heating forming technology by using the moveable induction heating is used to form a concave-type plate. In shipyard, it is necessary to get a bigger contraction deformation at the plate edge for the concave plate. However, the heat input of the metal near the plate edge is less than that of the internal metal along the heating line due to the decrease of heat power near the plate edge, thus causing smaller transverse shrinkage of the plate edge. To solve this problem, the paper investigates the suitable heating way of the inductor for the concave plate forming. An electromagnetic coupling finite element model is built to simulate the moveable induction heating process and reveal different heating and forming characteristic of different inductor heating ways. The simulation results are verified by experiments data. Research results showed that the heating way by which the inductor moves out of plate edge is an effective heating technology which meets the forming requirement of the concave plate.

scholarly journals Development of a Novel Concrete Curing Method Using Induction Heating System

2020 ◽  
Vol 11 (1) ◽  
pp. 236
Author(s):  
Chi-Hyung Ahn ◽  
Jinbok Lee ◽  
Dong-Jin Kim ◽  
Hyun-Oh Shin
Keyword(s):  
Induction Heating ◽  
Cold Weather ◽  
Maximum Temperature ◽  
Strength Development ◽  
Test Results ◽  
Compression Tests ◽  
Cross Sectional ◽  
Heating Efficiency ◽  
Cross Sectional Dimension ◽  
Curing Method

This study aimed to develop an accelerated concrete curing method based on induction heating (IH) technology. The proposed curing method provides improved heating efficiency and safety since it directly heats only the metallic forms in a non-contacting manner. It also has the advantage of being capable of heating the concrete according to a desirable heating scenario. The effects of several parameters on its performance were evaluated using a finite element method (FEM)-based thermal analysis and heating performance tests. The FEM analysis revealed the steel form to be appropriate for the IH system. The analysis also revealed that equally spaced three-turn coils yielded increased temperature uniformity in the steel form, which was verified by results of the steel form heating experiments. Furthermore, the minimum temperature generated in the form was sufficient for concrete curing. The efficiency of the use of IH for concrete curing and the effects of curing parameters were further investigated through compression tests after applications of various curing methods and by examining the temperature distributions during curing. The test results revealed early strength development even under water freezing conditions. This demonstrated the effectiveness of IH for concrete curing in cold weather. However, the efficiency decreased when the cross-sectional dimension of the specimen increased. The test results also verified that the maximum temperature and duration of induction heat curing affect the early age strength of concrete.

Usefulness of Foundry Tooling Materials in Microwave Heating Process

2013 ◽  
Vol 58 (3) ◽  
pp. 919-922 ◽  
Author(s):  
K. Granat ◽  
B. Opyd ◽  
D. Nowak ◽  
M. Stachowicz ◽  
G. Jaworski
Keyword(s):  
Electromagnetic Field ◽  
Microwave Heating ◽  
Loss Factor ◽  
Perturbation Technique ◽  
Resonant Cavity ◽  
Precise Determination ◽  
Heating Process ◽  
Basic Criterion ◽  
Measurement Results ◽  
Heating Technology

Abstract The paper describes preliminary examinations on establishing usefulness criteria of foundry tooling materials in the microwave heating technology. Presented are measurement results of permittivity and loss tangent that determine behaviour of the materials in electromagnetic field. The measurements were carried-out in a waveguide resonant cavity that permits precise determination the above-mentioned parameters by perturbation technique. Examined were five different materials designed for use in foundry tooling. Determined was the loss factor that permits evaluating usefulness of materials in microwave heating technology. It was demonstrated that the selected plastics meet the basic criterion that is transparency for electromagnetic radiation.

A numerical study of the effect of the number of turns of coil on the heat produced in the induction heating process in the 3d model

2018 ◽  
Vol 18 (3) ◽  
pp. 408-419
Author(s):  
A J shokri ◽  
M H Tavakoli ◽  
A Sabouri Dodaran ◽  
M S Akhondi Khezrabad ◽  
◽  
...  
Keyword(s):  
Induction Heating ◽  
3D Model ◽  
Numerical Study ◽  
Heating Process

scholarly journals The induction heating process modelling of the waveguide paths’ flanges

2021 ◽  
Vol 1047 (1) ◽  
pp. 012027
Author(s):  
A V Milov ◽  
V S Tynchenko ◽  
S O Kurashkin ◽  
V E Petrenko ◽  
D V Rogova ◽  
...  
Keyword(s):  
Induction Heating ◽  
Process Modelling ◽  
Heating Process

scholarly journals Confinement effects for rubberised concrete in tubular steel cross-sections under combined loading

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
A. Mujdeci ◽  
D. V. Bompa ◽  
A. Y. Elghazouli
Keyword(s):  
Axial Compression ◽  
Cross Section ◽  
Cross Sections ◽  
Image Correlation ◽  
Combined Loading ◽  
Test Results ◽  
Compression Tests ◽  
Confinement Effects ◽  
Rubber Content ◽  
Dependent Modification

AbstractThis paper describes an experimental investigation into confinement effects provided by circular tubular sections to rubberised concrete materials under combined loading. The tests include specimens with 0%, 30% and 60% rubber replacement of mineral aggregates by volume. After describing the experimental arrangements and specimen details, the results of bending and eccentric compression tests are presented, together with complementary axial compression tests on stub-column samples. Tests on hollow steel specimens are also included for comparison purposes. Particular focus is given to assessing the confinement effects in the infill concrete as well as their influence on the axial–bending cross-section strength interaction. The results show that whilst the capacity is reduced with the increase in the rubber replacement ratio, an enhanced confinement action is obtained for high rubber content concrete compared with conventional materials. Test measurements by means of digital image correlation techniques show that the confinement in axial compression and the neutral axis position under combined loading depend on the rubber content. Analytical procedures for determining the capacity of rubberised concrete infilled cross-sections are also considered based on the test results as well as those from a collated database and then compared with available recommendations. Rubber content-dependent modification factors are proposed to provide more realistic representations of the axial and flexural cross-section capacities. The test results and observations are used, in conjunction with a number of analytical assessments, to highlight the main parameters influencing the behaviour and to propose simplified expressions for determining the cross-section strength under combined compression and bending.

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