DOI QR코드

DOI QR Code

적층각도를 지닌 CFRP 시험편에서의 크랙전파 특성

A Property of Crack Propagation at the Specimen of CFRP with Layer Angle

  • 황규완 (공주대학교 대학원 기계공학과) ;
  • 조재웅 (공주대학교 기계자동차공학부) ;
  • 조종두 (인하대학교 기계공학과)
  • Hwang, Gue Wan (Dept. of Mechanical Engineering, Graduate School, Kongju Univ.) ;
  • Cho, Jae Ung (Division of Mechanical & Automotive Engineering, Kongju Univ.) ;
  • Cho, Chong Du (Division of Mechanical Engineering, Inha Univ.)
  • 투고 : 2016.05.12
  • 심사 : 2016.10.10
  • 발행 : 2016.12.01

초록

CFRP는 탄소섬유를 기반으로 수지를 합침하여 제조된 복합소재로, 높은 비 강도와 경량성을 지녀 다양한 분야들에서 널리 사용되어지고 있다. 특히 일방향 탄소섬유는 적층 각도를 적용할 수 있으며 이때 적용된 적층 각도로 구성된 CFRP는 적층 각도가 없는 것보다 더 높은 강성을 가지고 있다. 본 논문에서는 적층 각도 변화에 따른 CFRP 소형 인장시험편의 크랙 전파와 파괴거동에 관한 것으로, 각 적층 각도에 따른 크랙 성장의 특성을 고찰한다. 적층 각도가 증가함에 따라 최대 응력 값이 작게 나타나고 크랙 전파가 더디게 나타나지만, 적층 각도 $60^{\circ}$를 기점으로 그 응력이 다시 증가되므로 서, 적층 각도에 따른 한계를 보이고 있다. 본 연구결과는 기계구조물의 CFRP사용에 있어 구조물내의 결함이 발생하였을 때의 피로파괴 가능성을 검증하는 자료로 사용될 수 있다고 사료된다.

키워드

CT 시험편;적층 각도;전변형량;변형 에너지;등가 응력

과제정보

연구 과제 주관 기관 : 한국연구재단

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