Type4 복합재 용기의 돔 형상에 따른 파열형태에 관한 연구

Abstract

In this work the augmented safety of Type 4 composite vessel in accordance with uniform-stress design hasbeen demonstrated through a series of burst tests and structural analyses. For this end, three sample vessels wereused: (1) designed as guided by the isotensoid dome theory (called iso-dome cylinder); (2) with dome longercompared to uniform-stress design (called prolate cylinder); and (3) with dome wider than uniform-stress design(called oblate cylinder). Structural analyses have been performed using ABAQUS finite element code based on theperiodic symmetry to circumferential direction. As a result, the maximum stresses are induced around the bodies ofall three cylinders. However, the analyses, with the assumption of possible defect demonstrate that the maximumstresses are induced around the dome knuckles for the prolate and the oblate cylinders. The results of the bursttests for the three cylinders show that the burst initiates from the cylinder body of the iso-dome cylinder and fromthe dome knuckles of the prolate and the oblate cylinders. Finally, it is recommended that, to comply with DOTCFFC 2007, the dome shape should be designed and fabricated as guided by the isotensoid dome theory.