서지주요정보
압축성형된 SMC 경량 구조재의 표면정도 향상에 관한 연구 = A study for surface grade improvement of light-weight structural parts of compression molded sheet molding compounds
서명 / 저자 압축성형된 SMC 경량 구조재의 표면정도 향상에 관한 연구 = A study for surface grade improvement of light-weight structural parts of compression molded sheet molding compounds / 정진호.
저자명 정진호 ; Jeong, Jin-Ho
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8006204

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 96031

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

An experimental study was carried out in this study to improve the surface grade of light-weight structural parts of compression molded SMC (sheet molding compounds). For this purpose, material property was characterized as a function of strain rate and temperature by simple compression test using grease oil between dies and SMC specimen. The characterized material property was verified by simulating the flat and cross-sectional T-shape molding based on thermo-viscoplastic finite element approach. The comparisons of loads between experiments and numerical simulation demonstrated the accuracy of the proposed material property. Material flow and temperature variations during compression molding were experimentally observed in the present investigation. Simplified slab and one dimensional finite difference analyses were conducted in determining the load and temperature predictions, respectively. Depending on process variables such as molding temperatures, mold closing speeds, and mold geometries, the mechanical properties were measured in terms of tensile, 3-point bending, and IZOD impact tests. In addition, fiber orientations were examined through taking scanning electron microscopy and taking photographs of the burnt specimen. In order to determine the surface quality of the molded parts, the surface roughness was measured at various locations. Then, the depth of the sink mark in the cross-sectional T-shape specimen was measured under various molding and geometric conditions. Based on the measured experimental data, non- dimensionalized empirical equation for predicting the sink mark depth was determined. The predicted values were compared well to experimental values for different molding cases. From the present investigation, it was found out that the surface quality improves when low molding temperature, fast mold closing speed, and in-plane flow was applied. Finally, in-mold coating set up was designed and manufactured to remove pin- holes or sink marks observed in the molded SMC parts. It was construed that the surface grade of light-weight structural parts of compression molded SMC could be improved by applying in-mold coating technique.

서지기타정보

서지기타정보
청구기호 {DME 96031
형태사항 xviii, 207 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jin-Ho Jeong
지도교수의 한글표기 : 임용택
지도교수의 영문표기 : Yong-Taek Im
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 199-207
주제 SMC(판성형 복합재)
압축성형
표면정도
경량 구조재
가는 홈
금형 내 코팅
SMC(Sheet Molding Compounds)
Compression Molding
Surface Grade
Light-Weight Structural Parts
Sink Mark
In Mold Coating
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