Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Penetration Fracture Characteristics of Orthotropic CFRP Laminates Shells according to Curvature

곡률이 다른 직교이방성 CFRP 적층쉘의 관통파괴특성

  • Yang, Yong Jun (Department of Fire and Safety Management, Dongkang College) ;
  • Pyeon, Seok Beom (Department of Fire and Safety Management, Dongkang College) ;
  • Cha, Cheon Seok (Department of Fire and Safety Management, Dongkang College) ;
  • Yang, In Young (Department of Mechanical System Engineering, Chosun University)
  • 양용준 (동강대학교 소방안전관리과) ;
  • 편석범 (동강대학교 소방안전관리과) ;
  • 차천석 (동강대학교 소방안전관리과) ;
  • 양인영 (조선대학교 기계시스템공학과)
  • Received : 2016.03.29
  • Accepted : 2016.11.12
  • Published : 2016.12.31
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Abstract

CFRP composite laminates are widely used as structural materials for airplanes, automobile and aerospace vehicles because of their high strength and stiffness. This study aims to examine an effect of curvature on the penetration fracture characteristic of an orthotropic composite laminated shell. For the purpose, we manufactured orthotropic CFRP shell specimen with different curvatures, and conducted a penetration test using an air-gun. Those specimens were prepared to varied curvature radius(${\infty}$, 200mm, 150mm and 100mm)and were stacked to $[O^{\circ}{_3}/90^{\circ}{_3}]_s$. When the specimen is subjected to transverse impact by a steel sphere(${\Phi}10$), the velocity of steel sphere was measured both before and after impact by determining the time for it to pass two ball-screen sensors located a known distance apart. As the curvature increases, the absorption energy and the critical penetration energy increased linearly because the resistance to the bending moment. Patterns of cracks caused by the penetration of CFRP laminated shells included fiber breakage, lamina fracture, matrix crack interlaminar crack and intralaminar crack.

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References

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