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사출 성형품의 금형내 잔류음력과 이형후 냉각에 의한 후변형 해석
양상식,권태헌,Yang, Sang-Sik,Gwon, Tae-Heon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.2
Deformation analysis of injection molded articles whose geometry is considered as the assembly of thin flat plates has been conducted. For the in-mold analysis, thermo-viscoelastic stress calculation of thermo-rheologically simple amorphous polymer and in-mold deformation calculation considering the in-plane mold constraint have been done. Free volume theory has been used to represent the non-equilibrium density state during the fast cooling. At ejection, instantaneous deformation takes place due to the redistribution of in-mold residual stress. During out-of-mold cooling after ejection, thermoelastic model based on the effective temperature has been adopted for the calculation of out-of-mold deformation. In this study, emphasis is also made on the treatment with regard to lateral constraint types during molding process. Two typical mold geometries are used to test the numerical simulation modeling developed in this study.
양상식(Sang sik Yang),박세진(Sejin Park),김연환(Yeon Hwan Kim),안세영(Seyoung An) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper a hydraulic active suspension system is mathⅢatically modelled. and frequency response of the suspension is obtained by experiment. It is shcwn that the results from the useful modelling and the dynamic testing agree each other. and the model is useful in the procedures of design and simulation of active suspension systems.<br/>
p$^+$ Si 외팔보 구조를 이용한 광학 소자용 마이크로 구동기의 제작
박태규,양상식,Park, Tae-Gyu,Yang, Sang-Sik 대한전기학회 2001 전기학회논문지C Vol.49 No.5
The paper represents the design and fabrication of an electrostatic micro actuator with $p^+$, Si cantilevers. The micro actuator consists of a plate suspended by four $p^+$, silicon cantilevers and an electrode on a glass substrate. The $p^+$, Si structure is fabricated by the boron diffusion process and the anisotropic wet etch process. The cantilevers of the micro actuator curl down because of the residual stress gradient in $p^+$, silicon. When the electrostatic forec is applied to the $p^+$, cantilevers, the vertical displacement of the plate can be achieved. The deflection of the cantilever due to the residual stress gradient and the vertical displacement by electrostatic force were calculated. The displacement of the plate was measured with a laser displacement meter for various input voltages and frequencies. The feasibility of the proposed micro actuator for the applications to optical pickup devices or optical communication devices was confirmed by the experiments.