Identifikasi Delaminasi Batang Komposit Rami dengan Metoda Respon Frekuensi
Identification of delamination composite beam for four layers by using piezoelectric sensors. Damage index is based delamination area (cross-sectional area ratio of delamination of the beam cross-sectional area). The purpose of research is to determine the location and cross-sectional area of delamination in composite materials beam four layers. Test bean varied in five variations of fiber orientation; s , s , s , [±450]s dan [00/900]s, five variations defect distance from the tip of the beam; 50, 100, 150, 200 and 250 mm, five variations of the damage index; 0:17, 0:22, 0:25, 0:28 and 0:33. Testing method used by the impulse frequency response method. Impulse testing in accordance with ASTM E 756. The results showed the natural frequency of the composite beam influenced by the orientation of the fiber direction, the distance from the tip of the beam defects and damage index.