서지주요정보
광음향효과를 이용한 균질 및 경사성 이상복합체에서 첨가제 체적비의 정량적 결정 = Quantitative evaluation of the filler volume fraction in homogeneous and graded composites by photoacoustic method
서명 / 저자 광음향효과를 이용한 균질 및 경사성 이상복합체에서 첨가제 체적비의 정량적 결정 = Quantitative evaluation of the filler volume fraction in homogeneous and graded composites by photoacoustic method / 장문규.
저자명 장문규 ; Jang, Moon-Gyu
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007544

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 97014

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The quantitative evaluation of the filler volume fraction was made by incorporating the Rosencwaig-Gersho theory with the Maxwell-Garnet effective medium theory in homogeneous and graded two phase composites. The variation of the photoacoustic signal was measured along the sedimentation direction of aluminum-epoxy composites prepared by the sedimentation method. The photoacoustic signal decreased exponentially along the sedimentation direction due to the increse in the effective thermal conductivity as the aluminum concentration increases, which could be understood from the relationship of the photoacoustic signal to the thermal conductivity of the Rosencwaig-Gersho theory. Quantitative estimation of the aluminum volume fraction was made from the variation of the photoacoustic signal incorporating the Rosencwaig-Gersho theory and the Maxwell-Garnet effective medium theory. The aluminum volume fraction in the epoxy-matrix increased exponentially from 0 to 50% along the sedimentation direction in agreement with the result of quantitative image analysis within 5%, which justifies the use of the photoacoustic method in determining the filler volume fraction in two-phase composites. The cavity volume fraction was higher at the nearly center part of gauge length than that at the shoulder parts in each superplastically deformed sample. The local fluctuation of cavity volume fraction arised from local inhomogeneous superplastic deformation and the fluctuation was greater for the specimen of higher percentage elongation due to the increased inhomogeneous deformation and the coalescence of cavities. The averaged cavity volume fraction increased linearly with percentage elongation which indicated the linear dependence of cavity volume fraction with percentage elongation. The averaged cavity volume fraction increased with depth. The variation of the photoacoustic signal in graded aluminum-epoxy was measured with varying chopping frequency to evaluate the quantitative aluminum volume fraction with depth. The decrease of the normalized photoacoustic signal with decreasing chopping frequency was attributed to the increase of the averaged thermal effusivity due to the increase of the aluminum concentration with depth. Estimation of the quantitative aluminum volume fraction was made from the variation of the photoacoustic signal by incorporating Rosenwaig-Gersho theory combined with the Maxwell-Garnet effective medium theory. The aluminum volume fraction evaluated from the variation of the photoacoustic signal was in agreement with quantitative image analysis to within 3% which justified the use of the photoacoustic method in determining the filler volume fraction and its depth profile in graded two phase composites.

서지기타정보

서지기타정보
청구기호 {DPH 97014
형태사항 viii, 100 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Moon-Gyu Jang
지도교수의 한글표기 : 남창희
지도교수의 한글표기 : 김호철
지도교수의 영문표기 : Chang-Hee Nam
지도교수의 영문표기 : Ho-Chul Kim
수록잡지명 : "Quantitative Evaluation of Aluminum Volume Fraction Using Photoacoustic Method in Aluminum-Epoxy Composites Prepared by Sedimentation". Jpn. J. Appl. Phys., vol. 35, no. 5A, pp. 2758--2761 (1996)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 97-100
주제 Photoacoustics
Effective medium theory
Two phase composites
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