In this study, we investigated the properties of adhesive materials with different lightweight materials such as CFRP and Al-foam. The specimens were tested and analyzed using DCB (Double Cantilever Beam) specimens. In order to secure the reliability of the finite element method, the test and analysis were carried out, and the reliability of the finite element method was secured by using the graph of reaction force to displacement based on the experiment and analysis. The study on the adhesive failure characteristics according to the position of notch hole proceeded. Notch holes were generated at the locations of 40, 110, 150 and 190 mm from the beginning of the specimen near the bonding interface, and the analysis conditions used were the same as those used for securing reliability. The obtained study results are compared with reaction force and equivalent stress. In the case of reaction force, the overall tendency is similar but the difference in maximum reaction force is found. It was found that higher reaction forces appeared at the beginning than at the end of the bonding interface. When the equivalent stresses in the specimens were examined, the value of CFRP was seen to be 30 times higher as much as that of Al-foam.

본 논문은 중간부 부착파괴된 CFRP 보강 RC 보의 휨강도 산정을 다루고 있다. CFRP 보강 RC 보의 중간부 부착파괴의 영향을 고려하기 위해 강도감소계수를 제안하였다. 제안된 계수는 CFRP의 유효응력(또는 유효변형률)과 극한응력(또는 극한변형률) 비로 정의 되는 유효변률 모델을 이용하여 실험데이터로부터 유도하였다. 휨강도 산정식은 강도감소계수를 변수로 하여 함수를 구성하였다. 제안된 강도감소계수의 유효성, 정확성 및 타당성을 입증하기 위해서 각국의 설계기준 및 연구자들에 의해 제안된 계수 값과 실험값을 본 연구결과와 비교 및 검증했다. 본 논문에서 제시하는 해석 결과는 제안된 강도감소계수가 중간부 부착파괴된 CFRP 보강 RC 보의 휨강도를 매우 효율적으로 평가할 수 있음을 나타낸다.