Experimental Study on the Ultimate Strength of Composite Cylinders under Hydrostatic Pressure

J. Ocean Eng. Technol. 2007;21(3):52-57.

Cho, Sang-Rai;Koo, Jeong-Bon;Cho, Jong-Rae;Kwon, Jin-Hwe;Choi, Jin-Ho;Kim, Hyun-Su;

School of Naval Architecture and Ocean Engineering, Ulsan Univ.;School of Naval Architecture and Ocean Engineering, Ulsan Univ.;Dept. of Mechanical and Information Engineering, Korea Maritime Univ.;School of Mechanical and Aerospace Engineering, Kyung-San

수압을 받는 복합재 원통의 최종강도 실험 연구

조상래;구정본;조종래;권진회;최진호;김현수;

울산대학교 조선해양공학부;울산대학교 조선해양공학부;해양대학교 기계정보공학과;경상대학교 기계항공공학부;경상대학교 기계항공공학부;울산대학교 조선해양공학부;

Keywords: Composite cylinder, Ultimate strength, Initial imperfection, Isotropic material, Hydrostatic pressure test

핵심용어: 복합재 원통, 최종강도, 초기 결함, 등방재, 수압실험

Abstract

Composite material is one of the strongest candidates for deep see pressure hulls. Research regarding composite cylinders, subjected to hydrostatic pressure, has been ongoing for a couple of decades, abroad, but domestic research is very new. Experimental investigations seem necessary, in order to understand their structural behavior not only up to the ultimate limit state, but in the post-ultimate regime. That experimental information will be very helpful in the development of any theoretical methods or to substantiate any commercial numerical packages for structural analyses. In this study, ultimate strength tests on seven composite cylinders subjected to hydrostatic pressure are reported, which includes the fabrication method of models, mechanical properties of the material, initial shape imperfection measurements, test procedure, and strain and axial shortening measurements during the tests. The ultimate strengths of the models were compared with predictions of numerical analyses. The numerical predictions are higher than the test results. It seems necessary to improve the accuracy of the numerical predictions by considering the initial shape and material imperfections.