• Title/Summary/Keyword: Thermal Coupling

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Delamination Evaluation of Thermal Barrier Coating on Turbine Blade owing to Isothermal Degradation Using Ultrasonic C-scan Image (초음파 C-scan을 이용한 터빈 블레이드 열차폐코팅의 등온열화에 의한 박리 평가 기법)

  • Lee, Ho-Girl;Kim, Hak-Joon;Song, Sung-Jin;Seok, Chang-Sung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.5
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    • pp.353-362
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    • 2016
  • Thermal barrier coating (TBC) is an essential element consisting of a super-alloy base and ceramic coating designed to achieve long operational time under a high temperature and pressure environment. However, the top coat of TBC can be delaminated at certain temperatures with long operation time. As the delamination of TBC is directly related to the blade damage, the coupling status of the TBC should be assured for reliable operation. Conventional studies of nondestructive evaluation have been made for detecting generation of thermally grown oxide (TGO) or qualitatively evaluating delamination in TBC. In this study, the ultrasonic C-scan method was developed to obtain the damage map inside TBC by estimating the delamination in a quantitative way. All specimens were isothermally degraded at $1,100^{\circ}C$ with different time, having different partial delamination area. To detect partial delamination in TBC, the C-scan was performed by a single transducer using pulse-echo method with normal incidence. Partial delamination coefficients of 1 mm to 6 mm were derived by the proportion of the surface reflection signal and flaw signal which were theoretical signals using Rogers-Van Buren and Kim's equations. Using the partial delamination coefficients, the partial delamination maps were obtained. Regardless of the partial delamination coefficient, partial delamination area was increased when degradation time was increased in TBC. In addition, a decrease in partial delamination area in each TBC specimen was observed when the partial delamination coefficient was increased. From the portion of the partial delamination maps, the criterion for delamination was derived.

Study for Characteristic of Frictional Heat Transfer in Rotating Brake System (회전을 고려한 브레이크 디스크의 마찰열전달 연구)

  • Nam, Jiwoo;Ryou, Hong Sun;Cho, Seong Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.10
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    • pp.817-822
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    • 2017
  • The braking system is one of the most important components in vehicles and machines. It must exert a reliable braking force when they are brought to a halt. Generally, frictional heat is generated by converting kinetic energy into heat energy through friction. As the kinetic energy is converted into heat energy, high temperature heat is generated which affects the mechanical behavior of the braking system. Frictional heat affects the thermal expansion and friction coefficient of the brake system. If the temperature is not controlled, the brake performance will be decreased. Therefore, it is important to predict and control the heat generation of the brake. Various numerical analysis studies have been carried out to predict the frictional heat, but they assumed the existence of boundary conditions in the numerical analysis to simulate the frictional heat, because the simulation of frictional heat is difficult and time consuming. The results were based on the assumption that the frictional heat is different from the actual temperature distribution in a rotating brake system. Therefore, the reliability of the cooling effect or thermal stress using the results of these studies is insufficient. In order to overcome these limitations and establish a simulation procedure to predict the frictional heat, this study directly simulates the frictional heat generation by using a thermal-structure coupling element. In this study, we analyzed the thermo-mechanical behavior of a brake model, in order to investigate the thermal characteristics of brake systems by using the Finite Element method (FEM). This study suggests the necessity to directly simulate the frictional heating and it is hoped that it can provide the necessary information for simulations.

Exchange Coupling Field and Thermal Stability of Ni80Fe20/[Ir22/Mn78-Mn]/Co75Fe25 Multilayer Depending on Mn Content (Ni80Fe20/[Ir22/Mn78-Mn]/Co75Fe25 다층박막에서 Mn 함유량에 의존하는 교환결합력과 열적안정성)

  • Kim, B.K.;Lee, J.Y.;Kim, S.S.;Hwang, D.G.;Lee, S.S.;Hwang, J.Y.;Kim, M.Y.;Rhee, J.R.
    • Journal of the Korean Magnetics Society
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    • v.13 no.5
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    • pp.187-192
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    • 2003
  • The magnetic and thermal properties of NiFe/[IrMn-Mn]/CoFe with Mn additions have been studied. As-deposited CoFe pinned layers with [IrMn-Mn]layer had dominantly larger exchange biasing field ( $H_{ex}$) and blocking temperature ( $T_{b}$) than those with pure I $r_{22}$M $n_{78}$ used. The $H_{ex}$ and $T_{b}$ improved with 76.8-78.1 vol% Mn, but those of the NiFe/IrMn/CoFe dropped considerably with more addition of 0.6 vol % Mn. The average x-ray diffraction peak ratios of fcc [(111)CoFe, NiFe]/(111)IrM $n_3$ textures for the Mn inserted total vol of 75.5, 77.5, and 79.3% were about 1.4, 0.8, and 0.6, respectively. For the sample without Mn inserted layer, the $H_{ex}$ between IrMn and CoFe layers was almost zero, but it increased to 100 Oe after annealing of 250 $^{\circ}C$. For as-grown two multilayers samples with ultra-thin Mn layers of 77.5 and 78.7 vol %, the $H_{ex}$s were 259 and 150 Oe, respectively. In case of IrMn with 77.5 vol% Mn, the $H_{ex}$ was increased up to 475 Oe at 350 $^{\circ}C$ but decreased to 200 Oe at 450 $^{\circ}C$, respectively. The magnetic properties and thermal stabilities of NiFe/[IrMn-Mn]/CoFe multilayer were enhanced with Mn additions. In applications where higher $H_{ex}$ and $T_{b}$ are required, proper contents of Mn can be used. be used. used.

A Evaluation Technique for Reliability of Extra-High Voltage Cable Accessories using High Frequency Partial Discharge Measurement (고주파 부분방전 측정에 의한 초고압 접속함 신뢰성 평가 기술)

  • Sin, Du-Seong;Lee, Chang-Yeong;Kim, Chung-Sik;Jeon, Seung-Ik;Kim, Dong-Uk;Park, Wan-Gi
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.3
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    • pp.186-195
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    • 2000
  • In this paper, partial discharge (PD) measurement was performed to evaluate the quality of the cable joint and termination constructions. The resistive coupling technique for PD detection using resistivity of semiconducting layer of the cable in the accessories, such as joints and terminations. With high frequency PD (HEPD) measurement, an excellent sensitivity below 20pC could be achieved under unshielded condition. The localization of the defects in the accessories could be identified. During heating cycle, PDs were monitored and analyzed. At that time, the PDs were dependent on the temperature of the heating cycle and showed cyclic behaviors, which were attributed to local delamination of the interfaces, between epoxy unit and stress relief cone(SRC) and between SRC and cable, due to the difference of thermal expansion. As a conclusion, HFPD measurement technique was proven to be an effective diagnostic method for qualification of extra high voltage (EHV) cable accessories. With this technique, the optimal design of the components of the accessories could be verified not only in an early stage but also under operating condition. This technique would result in the improvement of the reliability of the EHV cable accessories.

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Color Pure and Stable Blue Light Emitting Material Containing Anthracene and Fluorene for OLED

  • Park, Hyun-Tae;Oh, Dae-Hwan;Park, Jong-Won;Kim, Jin-Hak;Shin, Sung-Chul;Kim, Yun-Hi;Kwon, Soon-Ki
    • Bulletin of the Korean Chemical Society
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    • v.31 no.7
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    • pp.1951-1955
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    • 2010
  • A new blue light emitting anthracene derivative, 9,10-bis-(9',9'-diethyl-7'-t-butyl-fluoren-2'-yl)anthracene (BETF), has been designed and synthesized by a palladium catalyzed Suzuki cross-coupling. A theoretical calculation of the three-dimensional structure of BETF supports that it has a non coplanar structure and inhibited intermolecular interactions resulting in high luminescent efficiency and high color purity. BETF has good thermal stability with glass-transition temperature (Tg) of $131^{\circ}C$. The PL maximum of BETF in solution and film were 438 nm and 440 nm, respectively, showing pure blue emission. A multilayer device using BETF as emitting material exhibits maximum luminescence efficiency of 2.2 cd/A and a pure blue emission (Commission Internationale de L'Eclairage (CIE) coordinates of x = 0.15, y = 0.10).

BEAVRS benchmark analyses by DeCART stand-alone calculations and comparison with DeCART/MATRA multi-physics coupling calculations

  • Park, Ho Jin;Kim, Seong Jin;Kwon, Hyuk;Cho, Jin Young
    • Nuclear Engineering and Technology
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    • v.52 no.9
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    • pp.1896-1906
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    • 2020
  • The BEAVRS (Benchmark for Evaluation and Validation of Reactor Simulation) benchmark calculations were performed by DeCART stand-alone and DeCART/MATRA multi-physics coupled code system to verify their accuracy. The solutions of DeCART stand-alone calculations for the control rod bank worth, detector signal, isothermal temperature coefficient, and critical boron concentration agreed very well with the measurements. The root-mean-square errors of the boron letdown curves for two-cycles were less than about 20 ppm, while the individual and total control rod bank worth agreed well within 7.3% and 2.4%, respectively. For the BEAVRS benchmark calculations at the beginning of burnup, the difference between DeCART simplified thermal-hydraulic stand-alone and DeCART/MATRA coupled calculations were not significantly large. Therefore, it is concluded that both the DeCART stand-alone code and the DeCART/MATRA multi-physics coupled code system have the capabilities to generate high fidelity transport solutions at core follow calculations.

Synthesis and enhancements of exciton-phonon interactions for ZnO nanopencils by thermal evaporation (ZnO nanopencils의 합성과 향상된 exciton-phonon interactions)

  • Ahn, C.H.;Woo, C.H.;Bae, Y.S.;Choi, M.K.;Kim, Y.Y.;Kim, D.C.;Kong, B.H.;Cho, H.K.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.45-45
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    • 2009
  • 우리는 ZnO Template를 사용한 열기상법을 이용하여 수직 배양한 ZnO nanorods와 ZnO Nanopencils를 성장하였고, Dependency temperature Photoluminescence(PL)의 분석을 통하여 광학적 특성에 대해 분석을 하였다. ZnO 나노구조는 100K 이하의 온도에서 donor-bound exciton가 dominant하고, 100K 이상의 온도에서는 free exciton과 그들의 phonon-replica emission이 dominant한 것을 알 수 있었다. 하지만, ZnO nanorods와 nanopencils은 다른 exciton-phonon coupling의 strength에 의한 surface defects에 의해 excitonic emissions의 다른 거동을 보이는 것을 알았다. 이것으로 인해 상온 PL에서 ZnO nanopencil은 nanorods에 비해 52meV의 red shift를 보였다.

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Thermo-viscoplastic finite element analysis of orthogonal metal cutting considered tool edge radius (공구끝단반경이 고려된 2차원 금속절삭에 대한 열-점소성 유한요소해석)

  • Kim, Kug-Weon;Lee, Woo-Young;Sin, Hyo-Chol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.1
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    • pp.1-15
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    • 1998
  • In this paper, thermo-viscoplastic finite element analysis of the effect of tool edge radius on cutting process are performed. The thermo-viscoplastic cutting model is capable of dealing with free chip geometry and chip-tool contact length. The coupling with thermal effects is also considered. Orthogonal cutting experiments are performed for 0.2% carbon steel with tools having 3 different edge radii and the tool forces are measured. The experimental results are discussed in comparison with the results of the FEM analysis. From the study, we confirm that this cutting model can well be applied to the cutting process considered the tool edge radius and that a major causes of the "size effect" is the tool edge radius. With numerical analysis, the effects of the tool edge radius on the stress distributions in workpiece, the temperature distributions in workpiece and tool, and the chip shape are investigated.estigated.

Sol-gel Mechanism of Self-patternable PZT Film Starting from Alkoxides Precursors

  • Hwang, Jae-Seob;Kim, Woo-Sik;Park, Hyung-Ho;Kim, Tae-Song
    • Journal of the Korean Ceramic Society
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    • v.40 no.4
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    • pp.385-392
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    • 2003
  • Sol-gel preparation technique using a chemical reaction of metal alkoxides has been widely used for the fabrication of various materials including ceramics. However, its mechanism has been studied till now because a number of chemical ways are possible from various alkoxides and additives. In this study, the mechanism of hydrolysis, condensation, and polymerization of alkoxides were investigated from the fabrication of lead-zirconate-titanate (PbZr$\_$x/Ti$\_$l-x/O$_3$; PZT) thin film that is used as various micro-actuator, transducer, and sensor because of its high electro-mechanical coupling factors and thermal stability. Furthermore, the fabrication process and characteristics of self-patternable PZT film using photosensitive stabilizer were studied in order to resolve the problem of physical damage and properties degradation during dry etching for device fabrication. Using an optimum condition to prepare the self-patternable PZT film, more than 5000 ${\AA}$ thick self-patternable PZT film could be fabricated by three times coating. The PZT film showed 28.4 ${\mu}$c/cm$^2$ of remnant polarization (Pr) and 37.0 kV/cm of coercive field (E$\_$c/).

A semispherical SQUID magnetometer system using high sensitivity double relaxation oscillation SQUIDs for magnetoencephalographic measurements

  • Lee, Yong-Ho;Hyukchan Kwon;Kim, Jin-Mok;Kim, Kwoong;Park, Yong-Ki
    • Progress in Superconductivity and Cryogenics
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    • v.5 no.1
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    • pp.21-26
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    • 2003
  • We designed and constructed a multichannel superconducting quantum interference device (SQUID) magnetometer system to measure magnetic fields from the human brain. We used a new type of SQUID, the double relaxation oscillation SQUID (DROS). With high flux-to-voltage transfers of the DROS, about 10 times larger than the dc SQUIDs, simple flux-locked loop circuits could be used for SQUID operation. Also the large modulation voltage of the DROS, typically being 100 $mutextrm{V}$, enabled stable flux-locked loop operation against the thermal offset voltage drift of the preamplifier. The magnetometers were fabricated using the Nb/AlOx/Nb junction technology. The SQUID system consists of 37 signal magnetometers, distributed on a semispherical surface, and 11 reference channels were installed to pickup background noises. External feedback was used to eliminate the magnetic coupling with the adjacent channels. The liquid helium dewar has a capacity of 29 L and boil-off rate of about 4 L/d with the total 48 channel insert. The magnetometer system has an average noise level of 3 fT/√Hz at 100 Hz, inside a shielded loon, and was applied to measure auditory-evoked fields.