The Analysis of Radial Deformation on Annular Local Heating Processed Pipe. Study of fitted pipe's manufacturing method due to annular local heating process (Report 2).

1995 ◽  
Vol 13 (4) ◽  
pp. 619-627
Author(s):  
Toshiaki Araki ◽  
Hisao Hasegawa ◽  
Takeshi Yamada ◽  
Hiroyuki Matsumura ◽  
Kazuhiro Aoyama ◽  
...  
Keyword(s):  
Local Heating ◽  
Heating Process ◽  
Radial Deformation ◽  
Manufacturing Method

scholarly journals Microfluidic Chip for Trapping Magnetic Nanoparticles and Heating in Terms of Biological Analysis

2020 ◽  
Vol 30 (3) ◽  
Author(s):  
Tu Le Ngoc ◽  
Thinh Nguyen Cong ◽  
Lam Dai Tran ◽  
Van-Anh Nguyen ◽  
Ha Cao Hong
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Microfluidic Chip ◽  
Local Heating ◽  
Heating Process ◽  
Micro Channel ◽  
Dimethyl Siloxane ◽  
Planar Coil ◽  
Magnetic Filed ◽  
Channel Bottom

In this study, we reported the results of the design and the fabrication a planar coil in copper (square, a = 10 mm, 15mm high, 90 turns), these planar coils were integrated in a microfluidic chip for trapping magnetic nanoparticles and local heating applications. A small thermocouple (type K, 1 mm tip size) was put directly on top of the micro-channel in poly(dimethyl-siloxane) in order to measure the temperature inside the channel during applying current. The design of planar coils was based on optimizing the results of the magnetic calculation. The most suitable value of the magnetic field generated by the coil was calculated by ANSYS® software corresponded to the different distances from the coil surface to the micro-channel bottom (magnetic field strength Hmax = 825 A/m). The magnetic filed and heating relationship was balanced in order to manipulating the trapping magnetic nanoparticles and heating process. This design of the microfluidic chip can be used to develop a complex microfluidic chip using magnetic nanoparticles.

Free Form Fabrication of 3D-Ceramic Parts with InkJet-Printing

2006 ◽  
Vol 45 ◽  
pp. 720-725
Author(s):  
Ulrike Kaufmann ◽  
Urban Harrysson ◽  
Per Johander ◽  
Werner Bauer
Keyword(s):  
Structural Information ◽  
Raw Material ◽  
Free Form ◽  
Rapid Manufacturing ◽  
Heating Process ◽  
Sintering Process ◽  
Powder Bed ◽  
Manufacturing Method ◽  
Ink Jet ◽  
Good Flow

A rapid manufacturing method for fabrication of 3D ceramic parts will be presented. The structural information is printed by ink jet in powder layers of 80 µm thickness. Different granulated powders can be used, such as zirconia and alumina if they show good flow ability. After printing the structures a heating process takes place. After these the parts can be picked out from the powder bed. The manufactured parts can be impregnated with epoxy. Another option is the infiltration with ceramic slurries and glass with sintering to higher density. The sintering process has been studied and the shrinkage and material properties evaluated. The interrelationship between the raw material qualities, infiltration media and the sinter parameters as well as the material-specific properties such as density and stability will be presented. The manufacturing method is used for fabrication of moulds and cores for casting processes. Otherwise the process can be used for fast fabrication of models and prototypes. The possibilities to use these methods for implant manufacturing will be shown. A cost analysis has been performed comparing direct manufacturing of small batches of components to mould injection processes.

Development of a New Finite-Element Method to Analyze Deformation of Plate Due to Line Heating

2001 ◽  
Vol 17 (01) ◽  
pp. 1-7
Author(s):  
Seung Il Seo ◽  
Yoon Ho Yang ◽  
Chang Doo Jang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Local Heating ◽  
Heating Element ◽  
Heating Process ◽  
Labor Costs ◽  
Line Heating ◽  
Element Analysis ◽  
Energy Principle ◽  
Heating And Cooling

The line heating process has been used to create curved surfaces of ship structures. However, because it depends on a worker's skill and experience, it has been a factor in preventing the automation of shipyards and in consuming labor costs. In this paper, to reduce the trial-and-error procedure of line heating work by simulating the deforming process of a plate, a finite-element analysis method is proposed. A new element, called the line heating element, is defined and applied. The line heating element is assumed to have orthotropic material property. Shrinkage forces and moments resulting from line heating are obtained by integration of inherent strains formed by local heating and cooling. The shrinkage forces and moments at the inherent strain region are converted to equivalent nodal forces by the energy principle. Results calculated using the line heating element show good agreement with the results obtained by the commercial finite-element analysis code.

Development of a Novel Shell Shaping Method with CFRTP: Forming Experiment Using Localized Heating in Processing Point

2016 ◽  
Vol 874 ◽  
pp. 40-45 ◽  
Author(s):  
Tatsuki Ikari ◽  
Hidetake Tanaka ◽  
Naoki Asakawa
Keyword(s):  
3D Printing ◽  
Local Heating ◽  
Heating System ◽  
Shell Shape ◽  
Manufacturing Method ◽  
Localized Heating ◽  
Light Curing ◽  
Injection Molded ◽  
Equivalent Strength ◽  
Processing Point

Currently, 3D printing has been attracting attention as a new method of prototyping and manufacturing. However, in the case of molding of the shell shaped resin, products by the additive manufacturing method has low strength of the interlayer adhesion and low stiffness of the light curing resin. For these reasons it is difficult to achieve the equivalent strength to injection-molded products.In study, in order to improve the strength of shell shape 3D printing, the authors propose a novel forming method by means of CFRTP and a forming system based on CAD data with local heating system, which can maintain the target formable temperature by a feedback control system was developed.

scholarly journals Evaluation of Thermal Damage Impact on Microstructure and Properties of Carburized AISI 9310 Gear Steel Grade by Destructive and Non-Destructive Testing Methods

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5276
Author(s):  
Kamil Dychtoń ◽  
Andrzej Gradzik ◽  
Łukasz Kolek ◽  
Krzysztof Raga
Keyword(s):  
Local Heating ◽  
Fatigue Cracking ◽  
Barkhausen Noise ◽  
Heating Process ◽  
Process Conditions ◽  
Case Hardening ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Microstructure And Properties ◽  
Non Destructive

Advanced aircraft gearboxes operate under high mechanical loads. Currently, aircraft gears are manufactured from chromium–nickel–molybdenum steel grades such as AISI 9310 or Pyrowear 53. The major causes of gear failure are wear and fatigue cracking. As the crack initiation occurs predominantly on the component surface, the gears are routinely subjected to surface hardening processes such as low-pressure carburizing and case hardening. The gears are manufactured in a multiple operation process, in which teeth grinding is a crucial step. Selection of improper grinding conditions can lead to local heat concentration and creation of grinding burns, which are small areas where microstructure and properties changes are induced by high temperature generated during grinding. Their presence can lead to significant reduction of gear durability. Therefore destructive and non-destructive (NDT) quality-control methods such as chemical etching or magnetic Barkhausen noise (MBN) measurements are applied to detect the grinding burns. In the area of a grinding burn, effects related to the over-tempering or re-hardening of the carburized case may occur. In this paper, the results of the studies on the characterization of microstructure changes caused by local heating performed to simulate grinding burns are presented. The areas with the over-tempering and re-hardening effects typical for grinding burns were formed by laser surface heating of carburized AISI 9310 steel. Analyses of the microstructure, residual stresses, retained austenite content, and non-destructive testing by the MBN method were performed. The correlation between the MBN value and the properties of the modified surface layer was identified. It was also found that the re-hardened areas had similar characteristics of changes in the Barkhausen noise intensity, despite the significant differences in the width of the overheated zone, which depended on the laser-heating process conditions.

Effects of Local Heating on Material Flow in Free Forming Process

2006 ◽  
Author(s):  
O. Okman ◽  
M. O¨zmen ◽  
H. Huwiler ◽  
A. E. Tekkaya
Keyword(s):  
Induction Heating ◽  
Material Flow ◽  
Failure Modes ◽  
Local Heating ◽  
Mechanical Analysis ◽  
Local Deformation ◽  
Forming Process ◽  
Manufacturing Method ◽  
Laser Beam Scanning ◽  
Electromagnetic Calculations

A novel manufacturing method is investigated, in which a proper temperature gradient is created within workpiece in order to control local material flow during free forming. The main motivation is to produce complicated shapes by reducing the flow stress on the regions, where local deformation is desired to take place. A sufficient control of temperature within the material results in the required product shape even in the absence of complicated dies. Besides the lower tooling costs the process provides, the heat energy applied to the workpiece is less than that in conventional hot forming processes, which is currently a strong alternative for manufacturing of such products. In the study, heating is realized by means of induction heating and laser beam scanning. The process is investigated experimentally on circular cylinder specimens made of different materials, namely Ti6Al4V, X5CrNi18/9 and 16MnCr5. The effect of process parameters on the mode of deformation is analyzed by finite element method (FEM). The thermo-mechanical analysis of induction heating is supported by electromagnetic calculations. The two alternative heating methods are compared. Affects of heating on multiple locations is investigated for induction heating applications. A brief overview of the process is presented and conclusions are drawn on the effectiveness, limitations, failure modes and applicability of the process.

UHV-TEM studies of laser-induced damage

1991 ◽  
Vol 49 ◽  
pp. 632-633
Author(s):  
T.S. Savage ◽  
R. Ai ◽  
D. Dunn ◽  
L.D. Marks
Keyword(s):  
Surface Science ◽  
Rapid Heating ◽  
Local Heating ◽  
Routine Practice ◽  
Transmission Electron ◽  
Northwestern University ◽  
Laser Induced Damage ◽  
Set Up ◽  
Focusing Lens ◽  
Diffusion Of Impurities

The use of lasers for surface annealing, heating and/or damage has become a routine practice in the study of materials. Lasers have been closely looked at as an annealing technique for silicon and other semiconductors. They allow for local heating from a beam which can be focused and tuned to different wavelengths for specific tasks. Pulsed dye lasers allow for short, quick bursts which can allow the sample to be rapidly heated and quenched. This short, rapid heating period may be important for cases where diffusion of impurities or dopants may not be desirable.At Northwestern University, a Candela SLL - 250 pulsed dye laser, with a maximum power of 1 Joule/pulse over 350 - 400 nanoseconds, has been set up in conjunction with a Hitachi UHV-H9000 transmission electron microscope. The laser beam is introduced into the surface science chamber through a series of mirrors, a focusing lens and a six inch quartz window.

Point-Cathode Electron Gun Using Electron-Beam Bombardment for Cathode Tip Heating

1990 ◽  
Vol 48 (1) ◽  
pp. 198-199
Author(s):  
Ryo Iiyoshi ◽  
Susumu Maruse ◽  
Hideo Takematsu
Keyword(s):  
Electron Beam ◽  
Tungsten Wire ◽  
Local Heating ◽  
Electron Gun ◽  
Original Position ◽  
Beam Power ◽  
Radius Of Curvature ◽  
High Brightness ◽  
Beam Focusing ◽  
Time Operation

Point cathode electron gun with high brightness and long cathode life has been developed. In this gun, a straightened tungsten wire is used as the point cathode, and the tip is locally heated to higher temperatures by electron beam bombardment. The high brightness operation and some findings on the local heating are presented.Gun construction is shown in Fig.l. Small heater assembly (annular electron gun: 5 keV, 1 mA) is set inside the Wehnelt electrode. The heater provides a disk-shaped bombarding electron beam focusing onto the cathode tip. The cathode is the tungsten wire of 0.1 mm in diameter. The tip temperature is raised to the melting point (3,650 K) at the beam power of 5 W, without any serious problem of secondary electrons for the gun operation. Figure 2 shows the cathode after a long time operation at high temperatures, or high brightnesses. Evaporation occurs at the tip, and the tip part retains a conical shape. The cathode can be used for a long period of time. The tip apex keeps the radius of curvature of 0.4 μm at 3,000 K and 0.3 μm at 3,200 K. The gun provides the stable beam up to the brightness of 6.4×106 A/cm2sr (3,150 K) at the accelerating voltage of 50 kV. At 3.4×l06 A/cm2sr (3,040 K), the tip recedes at a slow rate (26 μm/h), so that the effect can be offset by adjusting the Wehnelt bias voltage. The tip temperature is decreased as the tip moves out from the original position, but it can be kept at constant by increasing the bombarding beam power. This way of operation is possible for 10 h. A stepwise movement of the cathode is enough for the subsequent operation. Higher brightness operations with the rapid receding rates of the tip may be improved by a continuous movement of the wire cathode during the operations. Figure 3 shows the relation between the beam brightness, the tip receding rate by evaporation (αis the half-angle of the tip cone), and the cathode life per unit length, as a function of the cathode temperature. The working life of the point cathode is greatly improved by the local heating.

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