Small fishing vessels are manufactured using FRP. Various studies have been conducted to increase the strength of the composite material by mixing alumina powder with resin. Tensile tests and flexural strength tests are conducted to examine the effect of alumina powder on the strength of GFRP. In the current study, resin/alumina composites at different alumina contents (i.e., 0, 1, 5, and 10 vol%) have been prepared. The physical and mechanical properties of the prepared composites have been investigated. From the results, the tensile strength of the specimen with alumina powder mixed in at 10% shows the highest value of 155.66 MPa. The tensile strength of the specimen mixed with alumina powder increases with the amount of alumina powder impregnated. In the flexural strength test, the flexural strength of neat resin without alumina powder has a highest value of 257.7 MPa. The flexural modulus of ALMix-5 has a highest value of 12.06 GPa. Barcol hardness of ALMix- 10 has a highest value of 51. We show that alumina powder leads to decreasing cracks on the surface and decreasing length area of delamination.

Abstract
1. 서 론
2. 실험 방법
    2.1 시험편 재료
    2.2 시험편 제작
    2.3 인장 강도 시험편 제작
    2.4 굽힘 강도 시험편 제작
3. 시험결과 및 파단특징
    3.1 인장 강도 시험 방법 및 결과
    3.2 인장강도 파단 특징
    3.3 굽힘 강도 시험 방법 및 결과
    3.4 굽힘강도 파단 특징
    3.5 바콜 경도 시험
4. 고 찰
5. 결 론
References

• 강대곤(충북대학교 안전공학과) | Dae-Kon Kang (Department of Safety Engineering, Chungbuk National University)
• 박재학(충북대학교 안전공학과) | Jai-Hak Park (Department of Safety Engineering, Chungbuk National University) Corresponding author