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예비성형체 및 금속복합재료에 미치는 바인더의 영향에 관한 연구
남현욱,민병렬,이종해,한경섭,Nam, Hyun-Wook,Min, Byung-Ryoul,Lee, Jong-Hae,Han, Kyung-Seop 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
The effects of binder on the mechanical properties of the preforms and metal matrix composites (MMCs) were studied. Fibers were $9Al_2O_3{\cdot}2B_2O_3(Alborex)$, HTZ and $Al_2O_3$ fibers(Saffil) and binders were organic binder, inorganic binder, polyacrylamide under various PH conditions. Compressive strength of the preform increased with the addition of inorganic binder. The polyacrylamide did not improve the permeability of the preforms. PH of the slurry should be controlled because it affects the viscosity of the slurry. Good preforms were obtained under following conditions : 3 wt% inorganic binder, 0.1 wt% organic binder, 0.1 wt% polyacrylamide and PH 9. Tensile tests of MMCs were conducted at $20^{\circ}C,\;150^{\circ}C,\;250^{\circ}C,\;350^{\circ}C$ using MTS(100KN USA). Wear tests were conducted under various sliding speeds. High temperature($250^{\circ}C$) tensile strengths of Alborex/Saffil/AC8A and HTZ/AC8A are 80% and 75% of the room temperature tensile strengths respectively. The tensile and wear properties of the Alborex/Saffil/AC8A are superior to that of the HTZ/AC8A. The wear behavior of HTZ/AC8A shows more orthotropic characteristic than that of Alborex/Saffil/AC8A.
박선호(Park, Sun-Ho),한경섭(Han, Kyung-Seop) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
GFRP based composite rotor blades were developed for 750kW & 2MW wind turbines. The blade sectional geometry was designed to have a general shell-spar and shear web structure. For verifying the structural safety under all relevant extreme loads specified in the GL guidelines, the structural analysis of the rotor blades was performed using commercial FEM codes. The static load carrying capacity, blade tip deflections and natural frequencies were evaluated to satisfy the strength and stability requirements. Full-scale proof tests of rotor blades were carried out with optical fiber sensors for real-time condition monitoring. Finally, the prototype of each rotor blade passed all proof tests for GL certification.
용탕주조법을 이용한 금속복합재료 제조공정의 열전달 해석
정창규,정성욱,남현욱,한경섭,Jung, Chang-Kyu,Jung, Sung-Wook,Nam, Hyun-Wook,Han, Kyung-Seop 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
A finite element model is developed for the process of squeeze casting of metal matrix composites (MMCs) in cylindrical molds. The fluid flow and the heat transit. are fundamental phenomena in squeeze casting. To describe heat transfer in the solidification of molten aluminum, the energy equation is written in terms of temperature and enthalpy are applied in an axisymmetric model which is similar to the experimental system. A one dimensional flow model simulates the transient metal flow. A direct iteration technique was used to solve the resulting nonlinear algebraic equations, using a computer program to calculate the enthalpy, temperature and fluid velocity. The cooling curves and temperature distribution during infiltration and solidification were calculated fer pure aluminum. Experimentally, the temperature was measured and recorded using thermocouple wire. The measured time-temperature data were compared with the calculated cooling curves. The resulting agreement shows that the finite element model can accurately estimate the solidification time and predict the cooling process.
양유창(Yoo Chang Yang),한경섭(Kyung Seop Han) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Optical fiber vibrations sensors (OFVSs) and extrinsic Fabry-Perot interferometer (EFPI) were used in<br/> damage monitoring of fiber-metal laminates(FML). The optical fiber vibration sensor and EFPI were applied<br/> in order to detect and evaluate the strain, damage and failure of FML. Damages in composites, such as matrix<br/> cracks, delamination and fiber breakage may occur as a result of excessive load, fatigue and low-velocity<br/> impacts. Tensile and indentation test was performed with the measurement of optical signal and acoustic<br/> emission (AE). The signals of the optical fiber vibration sensor due to damages were quantitatively evaluated<br/> by wavelet transform. It was found that damage information of comparable in quality to acoustic emission<br/> data could be obtained from the optical fiber vibration sensor signals.
박선호(Park, Sun-Ho),한경섭(Han, Kyung-Seop) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.3
GFRP based composite rotor blades were developed for 750 kW & 2 MW wind turbines. The blade sectional geometry was designed to have a general shell-spar and shear web structure. For verifying the structural safety under all relevant extreme loads specified in the GL guidelines, the structural analysis of the rotor blades was performed using commercial FEM codes. The static load carrying capacity, blade tip deflections and natural frequencies were evaluated to satisfy the strength and stability requirements. Full-scale proof tests of rotor blades were carried out with optical fiber sensors for real-time condition monitoring. Finally, the prototype of each rotor blade passed all proof tests for GL certification.
지영미(Ji, Young-Mi),김현구(Kim, Hyun-Goo),정진화(Chung, Chin-Hwa),한경섭(Han, Kyung-Seop),박현철(Park, Hyun-Chul) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The wind speed measurement is performed using SODAR and LIDAR to evaluate availability of remote sensing in assessment of wind resource. The intercomparison comprises time series, correlation analysis and recovery rate. It shows that LIDAR is more effective than using SODAR to measure wind speed in ambient disturbance.