Effect of the Field Shaper Geometries in Electromagnetic Crimping of Tubes on Rods

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Ramesh Kumar ◽  
Sachin D. Kore
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
High Strain ◽  
Effective Length ◽  
Outer Diameter ◽  
Solenoid Coil ◽  
Element Analysis ◽  
Materials Properties ◽  
Inner Diameter ◽  
Joining Process

Abstract Electromagnetic crimping is a solid state, high-speed, and high strain-rate joining process. Finite element analysis, as well as experimental study, was carried out on three types of field shapers, namely, tapered, taper-stepped, and stepped. In all three field shapers, the effective length, outer diameter, inner diameter, total length, and materials properties were constant. These field shapers were kept inside the same multi-turn solenoid coil for all the experiments. It was found that the taper-stepped field shaper results better regarding impact velocity, Lorentz force, temperature generation, less heating, and uniformity in crimping among the three types of field shapers.

High Temperature Design and Damage Evaluation of Mod.9Cr-1Mo Steel Heat Exchanger

2011 ◽  
Author(s):  
Hyeong-Yeon Lee ◽  
Jong-Bum Kim ◽  
Jae-Hyuk Eoh ◽  
Yong-Bum Lee ◽  
Hong-Yune Park
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Fatigue Damage ◽  
Effective Length ◽  
Outer Diameter ◽  
Element Analysis ◽  
Test Loop ◽  
Creep Fatigue ◽  
Shell And Tube ◽  
Critical Locations

High temperature design and evaluation of creep-fatigue damage for sodium-sodium heat exchanger, DHX (Decay heat exchanger) in a sodium test loop have been conducted. The DHX is a shell- and tube-type heat exchanger with outer diameter of 21.7mm, thickness of 1.65mm and effective length of 1.73m. The DHX shell and tube materials were Mod.9Cr-1Mo steel. The temperatures of shell inlet and shell outlet in the DHX are 510°C and 308°C, respectively, while the temperatures of tube inlet and outlet are 254°C and 475°C, respectively. Three dimensional finite element analysis was conducted for the DHX and evaluation of creep-fatigue damage at several critical locations of the heat exchanger was carried out according to the elevated temperature design codes of the ASME Section III Subsection NH and RCC-MR. Evaluations on the integrity of the DHX and code comparisons were carried out for the critical locations of the DHX.

Experimental Investigation and Finite Element Analysis on Electromagnetic Compression Forming Processed Aluminum Alloy Tubes

2011 ◽  
Vol 110-116 ◽  
pp. 1706-1710
Author(s):  
Selvam Rajiv ◽  
Karibeeran Shanmuga Sundaram ◽  
Pablo Pasquale
Keyword(s):  
Experimental Investigation ◽  
Finite Element ◽  
Aluminum Alloy ◽  
High Speed ◽  
High Energy ◽  
Work Piece ◽  
Outer Diameter ◽  
Forming Process ◽  
Element Analysis ◽  
Electromagnetic Compression

Electromagnetic forming (EMF) is a high energy rate forming (HERF) process. It is a high speed forming process using a pulsed magnetic field to form work pieces made of metals such as copper or aluminum alloys with high electrical conductivity. The work piece to be deformed will be located within the effective area of the tool coil so that the resulting type of stress during the forming process is determined by the type of coil used and its arrangement as related to the component. Tubular or structural components can be narrowed by means of compression coils or widened by means of expansion coils, where as sheet metal can be deformed by flat coils. In this work, the experimental investigation and simulation of electromagnetic compression forming of aluminum alloy tubes is studied. The aim of the paper was to verify the results from Finite element methods with experimental data. Experiments were conducted on Tubes of outer diameter 40 mm and wall thickness of 2 mm with a nominal tensile strength of 214 MPa. The tube was compressed using a 4 turn helical actuator discharge that can be energied up to 20 kJ. A field shaper made of aluminum was used. A Maximum reduction of 15.85% in diameters were measured. The same problem was simulated in ANSYS using static coupled electromagnetic analysis. The results of the Simulation showed good correlation with experimental results.

Experimental Study on Heat Transfer and Fluid Flow in Vertical Rifled

2012 ◽  
Vol 505 ◽  
pp. 524-533 ◽  
Author(s):  
Abdulati Muftah Mohamed Ibrahim ◽  
Bashir Rahuma Elhub ◽  
H. Abas A. Wahab
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Flow Rate ◽  
Smooth Tube ◽  
Enhancement Effect ◽  
Outer Diameter ◽  
Flow Monitoring ◽  
Inner Diameter

In this paper, heat transfer and fluid flow monitoring experiments for pressure drop and efficiency were performed to investigate the fluid flow characteristics of rifled tubes in comparison with a smooth tube. The rifled tube has an outer diameter of 25mm, maximum inner diameter of 18.8 mm; minimum inner diameter of 17.50mm, rib height of 0.6835, rib width of 9.25, helix angles 60 o and the number of starts is four. The smooth tube has an outer diameter of 26.7mm and an inner diameter of 18.88 mm, with a wall thickness of 3.91mm. The experiments were conducted on a vertical orientation of the steel tubes (rifled and smooth) under varying flow rate of 15, 30, 40, 50, 60 and 70. The fluid used is 131.64 litres of water and the initial temperature is 25oC. The fluid is raised to an average temperature of 33oC during the experimental study. During the experiment, it was found that at 360 mins for the smooth tube, an increase in flow rate does not affect the time for the fluid (water) to attain a temperature of 33oC. For the rifled tube, as the flow rate increases, the time for the fluid (water) to attain a temperature of 33oC also increases. This is as a result of the effect of ribbing the tube. The time taken to attain the optimum temperature of 33oC is shorter using the rifled tube than the smooth tube. The rifled tube has heat transfer efficiency higher than the smooth tube. The pressure drop and the energy consumed by using the rifled tube were also found to be less than that of the smooth tube. The pressure drop increase factor was found to be 0.85 in the spirally rifled tube as compared to the smooth tube at the different flow rates. The enhancement effect of ribbing the tube is apparent.

An Investigation of the Steady-State Performance of a Wave Aerodynamic Thrust Bearing for High Speed Applications

2012 ◽  
Author(s):  
Nicoleta M. Ene ◽  
Florin Dimofte
Keyword(s):  
Steady State ◽  
High Speed ◽  
Thrust Bearing ◽  
Outer Diameter ◽  
Axial Loads ◽  
Numerical Predictions ◽  
Minimum Film Thickness ◽  
Computer Codes ◽  
Inner Diameter ◽  
Steady State Performance

The steady-state performance of an aerodynamic double thrust wave bearing was investigated. The investigation showed that a double thrust wave bearing with an inner diameter of 15 mm and an outer diameter of 45 mm can support axial loads of 200 N at 100,000 rpm for a minimum film thickness of 3 microns. The influence of the wave bearing parameters on the bearing performance was also analyzed. The theoretical analysis was validated by experimentally testing one side of the thrust bearing. A special test rig was built for this purpose. The experimental data were close to the numerical predictions, validating the computer codes.

Study on the Dynamic Characteristics of the Large Diamond Circular Saw Blade

2014 ◽  
Vol 945-949 ◽  
pp. 781-784 ◽  
Author(s):  
Min Zhao ◽  
Lin Zhang ◽  
Bin Wu
Keyword(s):  
High Speed ◽  
Outer Diameter ◽  
Circular Saw ◽  
Experiment Method ◽  
Circular Saw Blade ◽  
Inner Diameter ◽  
Vibration Problems ◽  
Saw Blade ◽  
Vibration Modal ◽  
Large Diamond

Large diamond circular saw blade is a plane with large diameters and thin thick, so there are serious vibration problems in the process of sawing stone under the high-speed. By using the force hammer producing incentive experiment method, the effect of the inner and outer diameters to the vibration modal and frequency of diamond circular saw blade are analyzed. Through comparing inner and outer diameter, it can be found that the inner diameter has greater influence on the natural frequency, while the outer diameter has greater influence on the amplitude. The result supplies reliable data for eliminate or reduce resonance damage.

scholarly journals Measurement of fracture properties of concrete at high strain rates

2017 ◽  
Vol 375 (2085) ◽  
pp. 20160174 ◽  
Author(s):  
V. Rey-De-Pedraza ◽  
D. A. Cendón ◽  
V. Sánchez-Gálvez ◽  
F. Gálvez
Keyword(s):  
Tensile Strength ◽  
High Speed ◽  
High Strain ◽  
Experimental Testing ◽  
Direct Analysis ◽  
Strain Rates ◽  
High Strain Rates ◽  
Dynamic Tensile Strength ◽  
Element Analysis ◽  
Initial Work

An analysis of the spalling technique of concrete bars using the modified Hopkinson bar was carried out. A new experimental configuration is proposed adding some variations to previous works. An increased length for concrete specimens was chosen and finite-element analysis was used for designing a conic projectile to obtain a suitable triangular impulse wave. The aim of this initial work is to establish an experimental framework which allows a simple and direct analysis of concrete subjected to high strain rates. The efforts and configuration of these primary tests, as well as the selected geometry and dimensions for the different elements, have been focused to achieve a simple way of identifying the fracture position and so the tensile strength of tested specimens. This dynamic tensile strength can be easily compared with previous values published in literature giving an idea of the accuracy of the method and technique proposed and the possibility to extend it in a near future to obtain other mechanical properties such as the fracture energy. The tests were instrumented with strain gauges, accelerometers and high-speed camera in order to validate the results by different ways. Results of the dynamic tensile strength of the tested concrete are presented. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

Analysis of High-Speed Energy-Storing Flywheel Rotor

2012 ◽  
Vol 214 ◽  
pp. 249-253
Author(s):  
Xiu Hua Zhang ◽  
Xue Feng Zhao ◽  
Xing Lei Zhang
Keyword(s):  
High Speed ◽  
Maximum Energy ◽  
Structure Design ◽  
Outer Diameter ◽  
Analysis Method ◽  
Interference Fit ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Inner Diameter ◽  
Flywheel Rotor

Appropriate rotor material and reasonable structure should be used for increase energy-storing density of flywheel. Theoretical analysis and design to high-speed energy-storing flywheel rotor with maximum energy-storing density is studied in the paper．The ratio of inner diameter and outer diameter and structure dimensions of a given condition flywheel rim is obtained by calculating. And the interference fit of rim/hub of the flywheel is analyzed with finite element software. One efficient and reliable calculating foundation and analysis method for the structure design of the flywheel rotor is provided.

Modeling of Subcritical Crack Growth due to Stress Corrosion Cracking: Transition From Surface Crack to Through-Wall Crack

2011 ◽  
Author(s):  
Do-Jun Shim ◽  
David Rudland ◽  
David Harris
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Surface Crack ◽  
Leak Rate ◽  
Outer Diameter ◽  
Element Analysis ◽  
Equivalent Area ◽  
Inner Diameter ◽  
Low Probability ◽  
Crack Transition

Recent work conducted using the Advanced Finite Element Analysis (AFEA) method to simulate the ‘natural’ crack growth of a circumferential PWSCC demonstrated that a subcritical surface crack can transition to a through-wall crack with significant differences between the inner diameter and outer diameter crack lengths. In the current version of the xLPR (Extremely Low Probability of Rupture) code, once the surface crack penetrates the wall thickness, an idealized through-wall crack (which has an equivalent area as the final surface crack) is formed. This type of crack transition was selected since no general stress intensity factor (K) solutions were available for crack shapes that would form during the transitioning stages, i.e., non-idealized or slanted through-wall cracks. However, during the pilot study of the xLPR code, it has been identified that this crack transition method may provide non-conservative results in terms of leak-rate calculations. In this paper, in order to compare the ‘natural’ versus ‘idealized’ crack transition behavior, limited example cases were considered where both crack transitions were simulated using 3D finite element analyses. In addition, leak-rate calculations were performed to study how the two different crack transition methods can affect the leak-rates. The results of the present study demonstrate that the ‘idealized’ transition from surface to through-wall crack can significantly affect the leak-rate calculations.

High Temperature Design and Damage Evaluation of MOD.9Cr-1Mo Steel Heat Exchanger

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Hyeong-Yeon Lee ◽  
Jong-Bum Kim ◽  
Hong-Yune Park
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Fatigue Damage ◽  
Effective Length ◽  
Outer Diameter ◽  
Element Analysis ◽  
Test Loop ◽  
Creep Fatigue ◽  
Shell And Tube ◽  
Critical Locations

High temperature design and evaluation of creep-fatigue damage for sodium-to-sodium heat exchanger, decay heat exchanger (DHX), in a sodium test loop have been conducted. The DHX is a shell- and tube-type heat exchanger with an outer diameter of 21.7 mm and effective length of 1.73 m. The DHX shell and tube materials were Mod.9Cr-1Mo steel. The temperatures of shell inlet and shell outlet in the DHX are 510 °C and 308 °C, respectively, while the temperatures of tube inlet and outlet are 254 °C and 475 °C, respectively. Three-dimensional finite element analysis was conducted for the DHX, and evaluation of creep-fatigue damage at several critical locations of the heat exchanger was carried out according to the elevated temperature design codes of the ASME Section III Subsection NH and RCC-MR. Evaluations on the integrity of the DHX and code comparisons were carried out for the critical locations of the DHX. The evaluation results showed that damages at the tubesheet joints of tube-to-tubesheet and tubesheet-to-shell were not so critical in the present DHX model.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

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