碳纳米管强化玻璃钢油管及接箍螺纹强度分析

Strength Analysis of Carbon Nanotubes Reinforced FRP Tubing and Coupling Thread

为了对碳纳米管强化玻璃钢油管及接箍螺纹强度进行分析,基于玻璃钢材料模型分析,建立了73.0 mm油管及接箍螺纹强度分析模型,分析了机紧过盈量、轴向载荷及内压对螺纹处应力、位移及接触压力的影响。分析结果表明:机紧过盈量0.08 mm产生的等效应力为11.4MPa,而200 k N的轴向载荷使得等效应力增大到135.6 MPa,21.0 MPa内压使得应力水平提高到266.9 MPa;200 k N轴向载荷作用使得螺纹啮合面产生明显相对滑动,有效啮合距离从1.3 mm降到1.1 mm,内压作用改善了啮合特征,使得有效啮合长度恢复到1.3 mm,轴向变形减小,但是油管的径向变形增大到0.9 mm。所得结论可为碳纳米管强化玻璃钢油管的现场应用提供参考。

In order to analyze the strength of carbon nanotubes reinforced glass fiber reinforced plastics （FRP） tubing and coupling thread, based on the analysis of FRP material model, the strength analysis model of Φ73. 0 mm tubing and coupling thread was established. The influences of machine tight interference, axial load and internal pressure on the stress, displacement and contact pressure of thread have been analyzed. The results showed that 0. 08 mm machine tight interference caused an equivalent stress of 11. 4 MPa, and the axial load of 200 kN in-creased the equivalent stress to 135. 6 MPa, while the internal pressure of 21. 0 MPa increased the equivalent stress to 266. 9 MPa. The 200 kN axial load resulted in significant relative sliding of the thread meshing surface, making the effective meshing distance reduced from 1. 3 mm to 1. 1 mm. The internal pressure improves the meshing char-acteristics, by increasing the effective meshing length to 1. 3 mm. The axial deformation of the tubing was reduced, but the radial deformation was increased to 0. 9 mm. The conclusion can provide references for the field application of carbon nanotubes reinforced glass fiber reinforced plastics.