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원종진(Chong-Jin Won),이종선(Jong-Sun Lee),홍석주(Suck-Ju Hong) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
In this study using linear deformation theories and by closed-form analysis and finite difference energy methods respectively various buckling load factors are obtained for stiffened laminated composite flat panels with rectangular type longitudinal stiffeners and various aspect ratios which are made from Carbon/Epoxy USN150 prepreg and are simply-supported on four edges under uniaxial compression. and then for them. optimal design analyses are carried out by the nonlinear search optimizer. ADS.
[구조강도부문] T형 보강재로 보강된 복합적층 원통형패널의 최적설계
원종진(Chong-Jin Won),이종선(Jong-Sun Lee),홍석주(Suck-Ju Hong) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. using linear and nonlinear deformation theories and by c1osed-form analysis and finite difference energy methods. respectively. various buckling load factors are obatined for stiffened laminated composite cylindrical panels with T type longitudinal stiffeners and various longitudinal length to radius ratios. which are made from Carbon/Epoxy USN 150 prepreg and are simply-supported on four edges under uniaxial compression. and then for them. buckling behavior design analyses are carried out by the nonlinear search optimizer. ADS.
[구조강도부문] 보강된 복합적층 원동형패널의 최소중량화 설계
원종진(Chong-Jin Won),이종선(Jong-Sun Lee),홍석주(Suck-Ju Hong) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. using linear and nonlinear deformation theories and by closed-form analysis and finite difference energy methods. respectively. various buckling load factors are obatined for stiffened laminated composite cylindrical panels with rectangular type longitudinal stiffeners and various longitudinal length to radius ratios. which are made from Carbon/Epoxy USN150 prepreg and are simply-supported on four edges under uniaxial compression and then for them. minimum weight design analyses are carried out by the nonlinear search optimizer. ADS.
SM45C材의 龜裂成長擧動에 미치는 Over Load의 影響
홍석주 조선대학교 동력자원연구소 1993 動力資源硏究所誌 Vol.15 No.1
In this study, the fatigue test loading constant repeated load over load was carried out with the SM45C specimen of general structure steel, Also, in the over load, the crack retardation phenomenon was discussed. The main conclusions obtained are summarized as followes. 1. From the fatigue test results loaded by constant repeated load, the fatigue crack invariable c and material constant m(c=4.263×10^-9, m=2.872) were concorded with the existing reserch results. In the experimental method of ΔK reduction, ΔK_th is 96.033㎏/㎜^3/2. 2. In the crack nose generated by over load, the compressive residual stresses were gradually lost by loading the repeated load continually, and in fracture line, nearly ceased The growing crack with residual stress lose was confirmed. 3. The plastic zone size formed on crack tip by over load was related to the linear with the compressive residual stresses, and the crack retardated phenomenon by over load predominantly effected by the compressive residual stress was considered.