钢丝缠绕增强塑料复合管的应力分析

Stress Analysis of Plastics Pipes Reinforced by Cross Helically Wound Steel Wires

将钢丝缠绕增强塑料复合管(PSP管)简化为内层、复合层、外层三层结构组成的力学模型,其中复合层由内外两层单层板组成。采用串并联模型确定单层板弹性参数,通过正交各向异性材料三维弹性理论推导出各层界面上接触压力与轴向力的方程组,进而得到PSP管各层在内压、外压和轴向力联合作用下的应力及应变计算公式。实验结果表明：随着内压载荷的增加,PSP管环向应变与轴向应变均呈上升趋势,理论值与实验结果较为一致,所建模型可用于预测PSP管应力和应变。

The steel wire cross helically wound polyethylene pipe was formulated as a three-layer model, which consisted of inner PE layer, composite layer and outer PE layer. Based on the three-dimensional （3-D） anisotropic elasticity, solutions for elastic stresses and strains of the PSP under internal pressure, external pressure, and axial force were developed; elastic parameters of the composite layer were obtained using series and parallel models. The experimental values were found in good agreement with theoretical predictions, the hoop strain and axial strain increased with the increasing inner pressure.