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곡률을 갖는 복합재 적층쉘의 적층구성에 따른 경사관통특성
조영재(Youngjea Cho),박병연(Byungyeon Park),양해진(Haejin Yang),김영남(Youngnam Kim),심재기(Jaeki Sim),양인영(Inyoung Yang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, this study aims at the evaluation on the characteristics of CFRP laminate shells using a penetration impact test. Carbon fiber reinforced plastics of the advanced composite materials as structural materials for transportation vehicles has a wide application in light weighs structure materials of airplanes, ships and automobiles because of high strength and stiffness. They are stacked to [0₂/90₂]S and [+45₂/-45₂]S their inter laminar number two. 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 ballistics-screen sensor located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decrease and slope angle on the impact surface increased.
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.
김영남(Youngnam Kim),조영재(Youngjea Cho),김성훈(Seunghoon Kim),이길성(Kilsung Lee),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is to study the effects of curvature and staking sequence on the penetration characteristics of composite laminated shell. And we were performed to investigate the penetration characteristics of composite laminated shells by the oblique impact. Composite laminates used in this test are CFRP orthtropic laminated plates, which are stacked with two-interfaces [0₃/90₃] sand [0₂/90₃/0] 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㎜ x 140㎜. 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 -screen sensor located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decrease and slope angle on the impact surface increased.