서지주요정보
압축성형 SMC 복합재료의 충격거동 예측에 관한 연구 = A study on impact behavior of compression molded sheet molding compounds composites
서명 / 저자 압축성형 SMC 복합재료의 충격거동 예측에 관한 연구 = A study on impact behavior of compression molded sheet molding compounds composites / 이상민.
저자명 이상민 ; Lee, Sang-Min
발행사항 [대전 : 한국과학기술원, 1999].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8009537

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 99054

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

In general, due to the brittle nature of composite materials, there exist many differences in the impact behaviors of metal and composite materials. More specifically, steel components absorb impact energy by plastic deformation while composite materials absorb it by damage mechanism such as fiber debonding, fiber fracture, and matrix cracking. In order to properly use composite materials in industrial applications, the impact property must be well known. In this study, the impact behavior of Sheet Molding Compounds (SMC), which is widely used in industry due to its relative low costs and high productivity, was examined. SMC acts as an elastic material until the applied stress exceeds a certain limit, whereafter the stiffness of the material drastically decreases. In order to conduct impact simulations of SMC flat plates, a modified damage model for SMC was developed and adopted in the user-defined material subroutine of the commercial simulation program LS-DYNA3D. For the sake of effectiveness of impact simulations and consideration of the local stiffness variations, the SMC material property was predicted with consideration of the local differences in fiber volume fraction. Also, an experimental study was carried out by developing a drop weight impact test system. Using this system, the dissipated impact energies of SMC flat plates were measured to investigate the influence of various parameters on the impact behavior. More specifically, drop weight impact tests were conducted by varying the impactor mass, intial velocity, impactor shape, and specimen thickness. The results showed that the specimen thickness variation had the greatest influence on determining the amount of energy dissipation compared to other factors. Thus, in the scope of the current study, it was found that the specimen thickness is the most important parameter that should be considered in the design of SMC components to be used as impact resistance applications. Finally, in order to examine the reliability of the developed impact simulation process, the simulation results were compared to the experimental drop weight test results.

서지기타정보

서지기타정보
청구기호 {MME 99054
형태사항 iv, 89 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sang-Min Lee
지도교수의 한글표기 : 임용택
지도교수의 영문표기 : Yong-Taek Im
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 37-40
주제 충격
SMC 복합재료
섬유 체적분율
자유낙하 충격시험
재료 물성치
Impact
SMC composite
Fiber volume fraction
Drop weight impact test
Material property
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