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원공조치를 가진 탄소섬유강화 플라스틱 적층판의 피로수명에측
허재석,황운봉,박현철,한경섭,Heo, Jae-Seok,Hwang, Un-Bong,Park, Hyeon-Cheol,Han, Gyeong-Seop 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.3
Fatigue life prediction and fatigue behavior of circular notched carbon fiber reinforced plastic laminates are presented. Point and average stress criteria by Whitney and Nuismer are generalized to fatigue fracture criteria for notched laminates. Residual strength degradation model and the assumptions on the stress redistribution are introduced during the derivation of prediction equations. S-N curve, Basquin's relation, and H and H's FLPE1 are chosen for evaluation of residual strength of unnotched laminates and six prediction equations are derived. Experiments are performed using Graphite/Epoxy laminates whose fiber orientation is $[0$^\circ$/+45$^\circ$/-45$^\circ$/90$^\circ$]s. Presented prediction equations are reasonably close to experimental data and proposed appoach is found to be suitable to predict fatigue life of notched composite laminates.
압전감지기/작동기를 이용한 복합적층판의 다중모드 진동제어
김문현,강영규,박현철,황운봉,한경섭,Kim, Mun-Hyeon,Gang, Yeong-Gyu,Park, Hyeon-Cheol,Hwang, Un-Bong,Han, Gyeong-Seop 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
Multi-model vibration control of laminated composites plates for various fiver orientations has been carried out by making use of piezolectric materials(PZT) as sensors and actuators. Cantilever plate is used as a specimen to test multi-modal vibration supression under random exitation. Impulse technique is applied to determine the natural frequency, the damping ratio(.zeta.) and the modal damping(2.zeta..omega.) of the first bending and the trosion modes. Two independent controllers are implemented to control the two modes simultaneously and established digitally on the basis of the direct negative velocity feedback control with collocated sensor/actuator. Experimental results for various fiber orientations and feedback gains are compared with finite element analysis considering stiffnesses and dampings of piezoeletiric sensors, actuators and bonding layer.