Polybenzimidazole (PBI) Coated CFRP Composite as a Front Bumper Shield for Hypervelocity Impact Resistance in Low Earth Orbit (LEO) Environment

사라스쿠마사티시쿠마; Venkat Akhil Ankem; 김윤호; 최충현; 김천곤

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자료유형: 학술저널

저자정보: 사라스쿠마사티시쿠마 Venkat Akhil Ankem 김윤호 최충현 김천곤

저널정보: 한국복합재료학회 Composites Research Composites Research 제31권 제3호

발행연도: 2018.1

수록면: 83 - 87 (5page)

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An object in the Low Earth Orbit (LEO) is affected by many environmental conditions unlike earth’s surface such as, Atomic oxygen (AO), Ultraviolet Radiation (UV), thermal cycling, High Vacuum and Micrometeoroids and Orbital Debris (MMOD) impacts. The effect of all these parameters have to be carefully considered when designing a space structure, as it could be very critical for a space mission. Polybenzimidazole (PBI) is a high performance thermoplastic polymer that could be a suitable material for space missions because of its excellent resistance to these environmental factors. A thin coating of PBI polymer on the carbon epoxy composite laminate (referred as CFRP) was found to improve the energy absorption capability of the laminate in event of a hypervelocity impact. However, the overall efficiency of the shield also depends on other factors like placement and orientation of the laminates, standoff distances and the number of shielding layers. This paper studies the effectiveness of using a PBI coating on the front bumper in a multi-shock shield design for enhanced hypervelocity impact resistance. A thin PBI coating of 43 micron was observed to improve the shielding efficiency of the CFRP laminate by 22.06% when exposed to LEO environment conditions in a simulation chamber. To study the effectiveness of PBI coating in a hypervelocity impact situation, experiments were conducted on the CFRP and the PBI coated CFRP laminates with projectile velocities between 2.2 to 3.2 km/s. It was observed that the mass loss of the CFRP laminates decreased 7% when coated by a thin layer of PBI. However, the study of mass loss and damage area on a witness plate showed CFRP case to have better shielding efficiency than PBI coated CFRP laminate case. Therefore, it is recommended that PBI coating on the front bumper is not so effective in improving the overall hypervelocity impact resistance of the space structure.

참고문헌 (12)

참고문헌 신청

Grossman, E. / 2003 / Space Environment Effects on Polymers in Low Earth Orbit / Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 208:48~57

Wright, D. / 2009 / Colliding Satellites: Consequences and Implications

ESA / 2013 / Space debris Story

Schonberg, W.P. / 1991 / Hypervelocity Impact Response of Aluminum Multi-wall Structures / Acta Astronautica 25(7):363~373

Christiansen, E.L. / 1993 / Design and Performance Equations for Advanced Meteoroid and debris Shields / International Journal of Impact Engineering 14(1-4):145~156

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