碳纤维增强环氧树脂复合材料修复N80Q钢管的力学性能

为考察碳纤维增强环氧树脂复合材料对环状腐蚀的N80Q钢管的修复效果,采用数值分析和全尺寸爆破试验对修复后的力学性能进行了研究,分析了缺陷轴向长度、缺陷深度和修复层厚度对修复效果的影响。结果表明:碳纤维增强环氧树脂复合材料对N80Q钢管的修复效果显著,经试验测试, 6 mm深缺陷的N80Q管道由碳纤维增强环氧树脂复合材料修复后爆破压力值提高了0.985倍;缺陷轴向长度对N80Q管道修复后的强度影响较小,随着缺陷轴向长度的增加,管道爆破压力值仅下降了3.5%;而缺陷深度对N80Q管道修复后的强度影响较明显,与无缺陷管道相比, 6 mm深缺陷管道修复后爆破压力值下降了9.9%, 7 mm深缺陷管道修复后爆破压力值下降了20.6%。

Mechanical properties of N80Q steel pipe repaired by carbon fiber reinforced epoxy resin composites

In order to investigate the repair effect of carbon fiber reinforced epoxy resin composite on the ring-corroded N80Q steel pipe, the mechanical properties of the repaired steel were studied by numerical analysis and full-scale blasting test. The effects of axial length, depth and repair layer thickness on the repairing effect were analyzed. The results show that the carbon fiber/epoxy composite has a remarkable effect on repairing the N80Q steel pipe and the bursting pressure value of the 6 mm deep defect pipe is raised by 0.985 times after repaired by the carbon fiber/epoxy composite; the axial length of the defect has little effect on the strength of the N80Q steel pipe after repaired by the carbon fiber/epoxy, and as the axial length of the defect increases, the pipe burst pressure value only gets reduced by 3.5%; the depth of the defect has an obvious effect on the strength of the N80Q steel pipe after repair:Compared with the non-defective pipe, the burst pressure value of the 6 mm deep defect pipeline is reduced by 9.9%, and the burst pressure of the 7 mm deep defect pipe is reduced by 20.6%.