Article
  • Monitoring of Damage Mechanism of Various Cross-Ply Laminates in Three Points Flexural Test
  • Lee JR, Kim JH, Lee JJ, Kim KC, Yoon DJ
  • 여러가지 직교 적층판의 삼점굴곡시험하에서의 손상메카니즘의 규명
  • 이재락, 김준형, 이주진, 김기철, 윤동진
Abstract
The laminates with the structures of (0°/90°)2s, (90°/0°)2s, (±45°)2s, (0°/90°/±45°)s, 및 (90°/0°/ 45°)s were cured in autoclave by using commerical prepreg P3052 from Toray Co. The damage mechanism of the above laminates in three points flexural test was determined from the results of the load-deflection curves, the acoustic emission, and the ultrasonic c-san test for the measurement of the delaminated area. The cross-head speed was 2 mm/min. The ratios between the supporting span and the thickness of the specimen were 40 : 1 and 16 : 1. The results show that the main damage mechanisms in three points flexural test are the damage of the matrix, the damage of the reinforcing fiber and the delamination for the above mentioned laminates. The relation between the supporting span and the thickness of the specimen gives great influence on the damage mechanism as well as the stacking sequences of the laminates.

상업용 탄소섬유/에폭시 프리프레그인 Toray P3052를 사용하여, (0°/90)2s, (90°/0°)2s, (± 45°)2s, (0°/90°/±45°)s, (90°/0°/ 45°)s 구조를 가지는 직교 적층판을 autoclave에서 성형하여, 시편을 제작한 뒤 삼점굴곡시험하에서의 손상메카니즘을 하중-처짐 곡선, 음향방출 시험결과 및 시험을 마친 시편의 손상영역을 초음파 c-scan방법으로 측정한 결과로 부터 종합적으로 규명하였다. 이때의 cross-head 속도는 2mm/min이고, 지지간 거리와 시편두께의 비는 40 : 1과 16 : 1를 채택하였다. 실헐결과 상기한 직교 적층판의 삼점굴곡하에서의 주된 손상메카니즘은 매트릭스의 손상, 보강섬유의 손상 및 층간 박리현상인데, 지지간 거리와 시편두께의 비가 적층구조와 더불어 손상형태에 큰 영향을 미친다.

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  • Polymer(Korea) 폴리머
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    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
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This Article

  • 1990; 14(2): 104-114

    Published online Apr 25, 1990