Analysis of Anisotropy in Carbon Fibre Reinforced Plastic Materials during Bending

Abstract

탄소섬유 강화플라스틱 재료를 층층이 쌓은 다층적층판과 옆으로 쌓은 적층판에 대한 중립축의 위치를 이론적으로 구하였다.

일축방향 [0°]와 [90°] 단층판에 대한 탄성계수의 측정결과 [0°]단층판에서는 인장시의 탄성계수가 압축시의 탄성계수보다 31% 더 컸고 [90°] 단층판에서는 7% 더 작았다.

다층 적층판의 중립축의 위치는 변형도 측정에 의해 실험적으로 구해졌다.

중립축 위치의 실험치와 이론치가 비교되었는데 [0°/90°/90°/0°] [0°/90°…/0°/90°] , [90°/0°/…/90°/0°] 적층판에서는 ?의 퍼센트 편차가 3% 이내였으나 [90°] 단층판이 압축하중을 받는 [90°/0°/0°/90°] 적층판에서는 15.3%라는 큰 편차가 나타났다.

The location of neutral axis in carbon/epoxy composites has been analysed theoretically with the flatwise multilayered laminates and edgewise laminates.

The modulus measurements of unidirectional [0°] and [90°] laminae were shown to be (Ett)0°=1.31(Ec)0° and (Et)90°=0.93(E0)90° respectively.

Experimental determination of the neutral axis was made from the strain measurements.

The comparison was made between these two results and the percentage deviation of ? was found to be less than 3% for [0°/90°/90°/0°] [0°/90°…/0°/90°] and [90°/0°/…/90°/0°] laminates, however, a substantial deviation was observed in the [90°/0°/0°/90°] laminate with [90°] lamina at the compression side.

The location of neutral axis in carbon/epoxy composites has been analysed theoretically with the flatwise multilayered laminates and edgewise laminates.

The modulus measurements of unidirectional [0°] and [90°] laminae were shown to be (Ett)0°=1.31(Ec)0° and (Et)90°=0.93(E0)90° respectively.

Experimental determination of the neutral axis was made from the strain measurements.

The comparison was made between these two results and the percentage deviation of ? was found to be less than 3% for [0°/90°/90°/0°] [0°/90°…/0°/90°] and [90°/0°/…/90°/0°] laminates, however, a substantial deviation was observed in the [90°/0°/0°/90°] laminate with [90°] lamina at the compression side.