서지주요정보
비대칭 복합적층평판의 경화된 형상에 대한 비선형 워핑해석 = Nonlinear warping analysis of the cured shape in unsymmetrically laminated plates
서명 / 저자 비대칭 복합적층평판의 경화된 형상에 대한 비선형 워핑해석 = Nonlinear warping analysis of the cured shape in unsymmetrically laminated plates / 전완주.
저자명 전완주 ; Jun, Wan-Jun
발행사항 [서울 : 한국과학기술원, 1989].
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소장정보

등록번호

8000055

소장위치/청구기호

학술문화관(문화관) 보존서고

DAE 8907

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초록정보

The warping of unsymmetrically laminated composite is induced by the thermal residual curing stress generated during the fabrication process. Classical lamination theory predicts the cured shapes of cross-ply laminate to be a saddle. Experimental observations, however, indicate some cross-ply laminated composites have cylindrical room-temperature shapes. This anomalous behavior is explained by the extension of classical lamination theory which involves nonlinear strain-displacement relations. Since in-plane residual shear strain exists in most cases of cross-ply laminates, formulating the nonlinear algebraic equations, the analysis including in-plane shear strain for the cross-ply laminates is presented. Present results indicate that thermal residual shear strain is negligible in cases that width-to-thickness ratios are very small or large. However, the significant amount of the shear strain exists in the range of medium width-to-thickness ratios where the bifurcation point occurs. From the displacement functions for the cross-ply laminates, the formulation which treats the curvatures and principal direction of curvature is derived for unsymmetric laminated composites with arbitrary lay-up angles. To allow freedom to the spatial variation of strains, strain and displacement functions are generalized to obtain the governing equation for general laminates with arbitrary lay-up angles. It is shown that principal direction of curvature calculated from classical lamination theory agrees with this analysis in the limited range of length-to-thickness ratios of laminates. Curvatures and principal direction of curvature in unsymmetric laminate depend upon the length-to-thickness, number of layer, lay-up angles, temperature, aspect ratio of the laminates. Curvatures are calculated for square and rectangular laminates as using the nonlinear Newton-Rapson iteration method numerically. It is shown that present numerical results are in good agreement with experimental results.

서지기타정보

서지기타정보
청구기호 {DAE 8907
형태사항 xii, 102 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : Ⅰ, Trifonometric relationships. - Ⅱ, Nonlinear algebraic governing equations for unsynmetric cross-ply Iaminates. - Ⅲ, 고전적층이론( Classical Lamination Theory )
저자명의 영문표기 : Wan-Jun Jun
지도교수의 한글표기 : 홍창선
지도교수의 영문표기 : Chang-Sun Hong
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 39-45
주제 Thermal stresses.
Curing.
Residual stresses.
Weaving.
복합 재료. --과학기술용어시소러스
열 응력. --과학기술용어시소러스
열 경화. --과학기술용어시소러스
잔류 응력. --과학기술용어시소러스
비선형 역학. --과학기술용어시소러스
Laminated materials.
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