Investigating the Effectiveness of a Composite Patch on Repairing Pipes Subjected to Circumferential Cracks under Combined Loadings

G. Rashed, H. Eskandari, Ardeshir Savari
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引用次数: 1

Abstract

The purpose of this study is to investigate bending moment and the axial load capacity of a pressurized pipe suffering from a through-wall circumferential crack repaired by a composite sleeve. The three-dimensional finite element method (FEM) was adopted to compute the results, and the failure assessment diagram (FAD) was employed to investigate the failure behavior of the repaired pipe. The findings revealed that, for the investigated range of applied loads and angles of the crack, the interaction of brittle and ductile failure modes is negligible. Additionally, the yield strength of the cracked pipe was considered as reference stress to achieve a conservative design. Two cases of the combined loading state consisting of internal pressure/bending moment and internal pressure/axial tensile force were investigated. Repairing the crack under combined loadings using carbon-epoxy composites was studied where the influences of various parameters, including internal pressure, crack angle, and the composite patch thickness on the capacity of the cracked pipe to withstand bending moment and axial load were included. The results indicated that the bending moment and axial load capacities of the cracked pipe depend on internal pressure, crack angle, and the composite patch thickness; nevertheless, the crack angle is the main parameter. A composite sleeve can increase both bending moment and axial load capacity of the cracked pipe, but bending moment can be increased further than axial load. Using the composite patch to repair the cracked pipe caused the bending moment capacity to improve from 14.28% to 120%. On the other hand, the composite patch raised the axial load capacity from 5.1% to 93.5%. Additionally, an increase in the composite patch thickness caused the axial load capacity to extend more than bending load capacity.
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复合补片修复复合载荷下周向裂纹管道的有效性研究
本研究的目的是研究经过复合材料套管修复的压力管道的贯通壁周向裂纹的弯矩和轴向载荷能力。采用三维有限元法(FEM)对结果进行计算,并采用失效评估图(FAD)对修复后管道的失效行为进行研究。结果表明,在所研究的载荷和裂纹角度范围内,脆性和延性破坏模式的相互作用可以忽略不计。此外,考虑裂纹管的屈服强度作为参考应力,实现了保守设计。研究了内压/弯矩和内压/轴向拉力两种组合加载状态。研究了复合载荷下碳-环氧复合材料对裂纹的修复,研究了内压、裂纹角度、复合材料补片厚度等参数对裂纹管道抗弯矩和轴向载荷能力的影响。结果表明:裂纹管道的弯矩和轴向载荷能力与内压、裂纹角度和复合片厚度有关;然而,裂纹角是主要参数。复合套筒可以增加裂纹管的弯矩和轴向载荷能力,但弯矩的增加幅度大于轴向载荷的增加幅度。采用复合补片修补裂纹管,使弯矩承载力由14.28%提高到120%。另一方面,复合贴片将轴向承载能力从5.1%提高到93.5%。此外,复合材料贴片厚度的增加导致轴向载荷能力的扩展大于弯曲载荷能力的扩展。
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