Study on load⁃bearing performance and structural optimization of buckling joint of polyester⁃fiber⁃reinforced plastic composite pipe

doi:10.19491/j.issn.1001-9278.2022.10.014

Abstract

Abstract:

Based on the finite element method， a three⁃dimensional finite element model was established for the assembly of polyester fiber reinforced plastic composite pipe and its metal clamping joint， and the influence of clamping amount and joint structural parameters on the joint sealing performance was analyzed. The results indicated that the sealing performance of the joint was improved with an increase in the clamping amount. However， the plastic deformation occurred in the tube under a large clamping amount， leading to a decrease in sealing performance. As the serrated angle increased， the sealing performance of the joint increased at first and then tended to decrease. The tube suffered plastic deformation at an angle greater than 55 °. The higher the sawtooth height， the better was the sealing performance of the joint. When the sawtooth height increased up to 3 mm， the stress value at the end of the core tube reached the strength at break. It is not recommended to set too many serrated teeth in the joint. When the number of teeth reaches 14， the tube body was severely squeezed at the end of the joint. Considering of the sealing performance and joint strength， the optimum clamping quantity was determined to be 5.5 mm， and the optimum structural parameters were determined to be a serrated angle of 50 °， a tooth height of 2.5 mm， and a serrated number of 11.

Key words: composite pipe, metal joint, sealing performance, contact pressure, structural optimization, finite element

CLC Number:

TQ323.4

ZHANG Xuemin, HUANG Haohan, LI Houbu, QI Guoquan, ZHAO Yuanchao, DING Han, GAO Xiong, YANG Wenhui. Study on load⁃bearing performance and structural optimization of buckling joint of polyester⁃fiber⁃reinforced plastic composite pipe[J]. China Plastics, 2022, 36(10): 90-97.

Figures/Tables 18

Fig.1. Saw tooth parameters of joint sealing structure

管道内压/MPa	扣压量/mm	齿角/（°）	齿高/mm	齿距/mm
3.75	5	45	1.5	16.5

Tab.1. RTP pipe joint sealing structure parameters

部件	材料	弹性模量/MPa	屈服强度/MPa
复合管内外层	高密度聚乙烯	850	25.9
金属接头	45钢	210 000	408

Tab.2. Material properties of inner and outer layers of joints and pipes

部件	材料	断裂强度/MPa	纤维层数
增强层	聚酯纤维	522.9	2

Tab.3. Parameters of polyester ply fibers

Fig.2. Finite element model of flexible pipe joint sealing structure

Fig.3. Flexible pipe and joint restraint and loading

Fig.4. Stress nephogram of each fiber reinforced layer of RTP pipe under internal pressure of 13.485 MPa

实验爆破压力/MPa	有限元压力/MPa	相对误差/%
12.7	13.485	3.68
14.4
14.9

Tab.4. Comparison between simulation results and experiment at ones

Fig.5. Blasting failure of RTP pipe and withholding joint

Fig.6. Contact pressure of liner of tube body under internal pressure 13.485 MPa

Fig.7. Changes of joint sealing performance under different clamping pressure

Fig.8. Effect of crimping amount on the maximum stress of polyethylene

Fig.9. Effect of serration angle on sealing performance

Fig.10. Contact pressure distribution of pipe body

Fig.11. Effect of saw tooth height on sealing performance

Fig.12. Stress nephogram of joints with different tooth height

Fig.13. Effect of saw tooth number on sealing performance

Fig.14. Radial deformation of pipe body

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