关键词: 内爆载荷, 复合材料浮盘, 抗爆性能, 基体拉伸, 蜂窝芯层

Abstract:

In order to elucidate the combustion and explosion of volatile gas leaks caused by degradation of the floating roof seal performance and its destructive mechanism on composite floating roofs, a multiphase coupled model of liquid storage-composite floating roof incorporating the cell structure of the honeycomb core layer was established. Multiphase coupling analysis of the tank's combustible gas, composite floating roof, and stored liquid was employed in this study to compare damage patterns in the roof panel and honeycomb core under implosion loads. A methodical inquiry was initiated to explore the impact of panel layering angles, honeycomb geometric parameters (including wall thickness, height, and edge length), and cellular element configurations (i.e., regular hexagons, circular, close-packed, and sparingly packed cells) on the blast resilience performance of floating roofs. The results indicate that, in circumstances where liquid levels are at a low ebb, the upper panel is primarily subject to matrix tensile damage (6.82% area fraction), accompanied by 0.16% fibre compression and matrix compression damage. The optimal panel lay-up angle [45°/90°/45°/90°] has been demonstrated to reduce matrix tensile damage to 5.03% area fraction, thus yielding the optimum level of explosion resistance. Hexagonal honeycomb cores have been shown to demonstrate superior blast resistance in comparison to circular cores, while densely packed circular honeycomb exhibits greater load-bearing capacity than sparsely packed configurations. Increasing the thickness and height of honeycomb cells, or reducing cell edge length, has been demonstrated to enhance the floating roof's capacity for blast resistance.

Key words: implosion load, composite floating roof, explosion resistance, matrix tensile, honeycomb core layer