关键词: BFRP缠绕管道, 三点弯曲试验, 拉拔试验, 直接接头, T形接头

Abstract: To promote the application of basalt fiber reinforced polymer (BFRP) pipes in the field of marine aquaculture, the continuous basalt fiber/vinyl ester resin (BF/VER) composite wound pipes were selected as the research object. Two large diameter BF/VER wound circular pipes were chosen for the three-point bending failure test, and five types of straight joints and two types of T-joints were subjected to the pull-out mechanical test to measure the mechanical properties of the pipes and their typical joints.The results show that the maximum loads at the rupture of the two 10-meter long large-diameter BF/VER wound pipes are 128.9 kN and 190.54 kN respectively. The failure locations are within the range of 1 m to 1.5 m from the loading area, and there are significant differences in the results obtained by different loading methods. The pull-out test indicates that, apart from the pipe body, the socket type straight joint exhibits the best tensile performance, with an ultimate load of 1 223 kN, which only differs from the tensile performance of the pipe body by 6%. An increase in the adhesive layer thickness of the straight joint is beneficial for enhancing its tensile performance. The tensile performance of T-joints of the same size is related to whether a saddle shaped hole is opened. The tensile performance of the joint without a saddle shaped hole is 12.2% higher than that of the joint with a saddle shaped hole.

Key words: BFRP wound pipes, three-point bending test, pull-out test, straight joint, T-joint