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FRP 복합재 박육부재의 적층구성이 압궤특성에 미치는 영향
김영남(Youngnam Kim),정종안(Jongan Jung),양인영(Inyoung Yang) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Because of the inherent flexibility in their design for improved material properties, composites have wide applications in aerospace vehicles and automobiles. The purpose of this study is to investigate the energy absorption characteristics of CFRP (Carbon Fiber Reinforced Plastics) tubes on static and impact tests. Static compression tests have been carried out using the static testing machine(Shin-gang buckling testing machine) and impact compression tests have been carried out using the vertical crushing testing machine. When such tubes were subjected to crushing loads, the response is complex and depends on the interaction between the different mechanisms. The collapse characteristics and energy absorption have been examined for various tubes. Energy absorption of the tubes are increased as changes in the lay-up which may increase the modules of tubes. The results have been varied significantly as a function of ply orientation and interlaminar number.
고온ㆍ고습 환경하에서 적층각 변화를 갖는 CFRP 복합재의 압궤변화 특성
양용준(Yongjun Yang),국현(Hyun Kook),정종안(Jongan Jung),양인영(Inyoung Yang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
CFRP composite material features superior heat and corrosion resistance, and these benefits enables the gradual applications on aerospace industries and sports-entertainment business. Exceptional corrosion resistance enables the acceptance in maritime structural members such as ship and oil-drilling machineries. However, CFRP composite material has the weakness in hygrothermal environment and shock resistance. Especially, moisture ingress into composite material under hygrothermal environment can change molecule arrangement and chemical properties. In addition, interface characteristics and component material properties can be degraded. Therefore, structural members with hat-shaped section, which are adopted in the actual automobile vehicle, were prepared for different stacking configurations. Moisture absorption characteristics and strength evaluation was empirically conducted after long-term exposure of differently stacked CFRP hat-shaped section member under hygrothermal environment.
박상국(SangGuk Park),김정호(JungHo Kim),정종안(JongAn Jung),심재기(JeaKi Sim),양인영(InYoung Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper CFRP composite materials widely used as structural materials for airplanes, ships and aero space vehicles because of their high strength and stiffness. Autoclave forming of CFRP process is the most commonly used method of applying heat and pressure simultaneously. This process is suitable for the structural aerospace and military applications which needs a high mechanical properties assisted by removal of trapped air or other volatiles. This study aims to investigate the effects of stacking sequence and distance on the penetration characteristics of CFRP laminated plates. They are stacked to [0₃/90₃]s, [0₂/90₃/0]s, [0/90₂/0₂/90]s, and their interlaminar numbers are two and six. They are distance to 0㎜ ~ 30㎜, and their real distance are 100㎜ ~ 300㎜. Composite laminated plates of dimensions 180㎜ × 180㎜ were prepared. The velocity of the steel ball that transversely impacts a specimen was measured both before and after impact by determining the time for the ball to pass two ballistic-screen sensors located at a known distance apart.
적층구성 및 곡률이 CFRP 적층쉘의 관통특성에 미치는 영향
조영재(Youngjea Cho),김영남(Youngnam Kim),정종안(Jongan Jung),임광희(Kwang hee Im),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Currently, carbon Qjftiber reinforced plastics (CFRP) are widely used in both space and civil aircraft due to their superior stiffness and strength to weight ratios compared to conventional metallic materials. This paper is to study the effects of curvature and staking sequence on the penetration characteristics of CFRP laminated shell. Composite laminates used in this test are CFRP orthtropic laminated plates, which are stacked with two-interfaces [0₃/90₃]s, [0₂/90₂]s and [0₂/90₃/0]s. [0/90₂0]s. They are manufactured to varied curvature radius (R = 100, 150, 200 ㎜ and ∞). They are cured by heating to the appropriate hardening temperature(130°) by mean of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100㎜ × l40㎜. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic QpRcreen sensor located a known distance apart. Absorbed energy increased as the curvature increased. [0₃/90₃] sand [0₂/90₂]s, which is small interlaminar number, was higher than fore interlaminar specimen.