弯矩作用下玻璃钢内衬再生复合管稳定性能分析

为研究弯矩作用下玻璃钢内衬再生复合管的稳定性能,采用有限元分析软件,基于层间双线性本构关系,建立玻璃钢内衬再生复合管有限元模型,分析外管腐蚀程度和内衬层厚度对玻璃钢内衬复合管稳定性能的影响,得到复合管受弯作用的应力云图并提取弯矩-管道中心点位移曲线。结果表明:外管壁与玻璃钢内衬层之间的层间作用力在一定程度上限制了管道变形的快速发展,提高了复合管的极限弯矩与因屈曲导致管道失稳破坏前的抗变形能力。带腐蚀坑的复合管道的变形与应力主要集中在腐蚀坑最深处周围,随着腐蚀深度的增加,弯矩极值逐渐降低。

Stability Analysis of GFRP Lining Recycled Composite Pipe Under Bending Moment

In order to study the stability of GFRP lined recycled composite pipe under bending moment, a finite element analysis software was used to establish the finite element model of GFRP lined recycled composite pipe based on the bilinear constitutive relationship between layers, and the influences of the corrosion degree of outer pipe and the thickness of inner layer on the stability of GFRP lined composite pipes was analyzed. The stress cloud diagram of the composite pipe under bending action was obtained and the curve of bending moment-center point displacement of the pipe was extracted. The results show that the interlayer force between the outer pipe wall and the GFRP lining layer limits the rapid development of pipeline deformation to a certain extent, and improves the ultimate bending moment of the composite pipe and the anti-deformation ability of the pipe before buckling. The deformation and stress of the composite pipe with corrosion pit are mainly concentrated around the deepest part of the corrosion pit. With the increase of corrosion depth, the extreme value of bending moment gradually decreases.