Simulation of pressure baring performance of high barrier non⁃metallic flexible composite pipes

doi:10.19491/j.issn.1001-9278.2023.12.011

Abstract

Abstract:

A barrier layer was added according to the structure of the composite pipe， and a three⁃dimensional model was established for high barrier non⁃metallic flexible composite pipes based on the finite element simulation. The influence of geometry and process parameters of the barrier layer on the pressure⁃bearing performance of the composite pipes was analyzed， and the optimal parameters of the barrier layer were determined. The results indicated that the stress of the aramid reinforced layer reached a maximum， followed by the aluminum foil barrier layer when the high barrier non⁃metallic flexible composite pipes were under pressure. The stresses of the inner lining layer and outer protective layer were the lowest. The thickness of the aluminum foil barrier layer generated the greatest influence on the pressure bearing performance of the composite pipes， followed by the influence of friction coefficient. The influence of width and winding angle of the aluminum foil layer was the lowest. Considering the pipeline stress and design cost， the optimum thickness， width， and winding angle of the aluminum foil barrier layer were determined to be 0.15 mm， 200 mm， and 70°， respectively.

Key words: non?metallic flexible composite pipe, finite element simulation, aluminum foil barrier layer, bearing capacity

CLC Number:

TQ320.72⁺4

ZHANG Xuemin, WANG Qinggang, ZHANG Xueru, LI Houbu, QI Guoquan, DING Han, GAO Xiong, YANG Wenhui. Simulation of pressure baring performance of high barrier non⁃metallic flexible composite pipes[J]. China Plastics, 2023, 37(12): 70-77.

Figures/Tables 15

Fig.1. Structure diagram of non⁃metallic composite coiled tube for hydrogen transport

项目	内径/mm	外径/mm	内层厚度/mm	外层厚度/mm
数值	150	186	10	5

Tab.1. Geometric parameters of non⁃metallic composite coiled tubes for hydrogen transport

项目	材料	弹性模量/MPa	拉伸强度/MPa
复合管内外层	PE⁃HD	850	25.9
铝箔	H18	30 000	165

Tab.2. Aluminum foil and pipe inner and outer layer material parameters

芳纶	纤维层数	拉伸强度/MPa	拉伸模量/MPa	延展率/%	密度/t·mm^-3	泊松比
Kevlar29	6	2 900	6×10⁴	3.6	1.44×10^-9	0.19

Tab.3. Mechanical parameters of aramid fibers

Fig.2. Finite element model of non⁃metallic composite coiled tube for hydrogen transportation

Fig.3. Aramid fiber layup model

Fig.4. Barrier layer mesh model

Fig.5. The stress distribution of each structural layer under internal pressure of 4.5 MPa

Fig.6. The stress curves of different structural layers with internal pressure load

Fig.7. Stress of different composite pipe structures against thickness of aluminumfoil

Fig.8. The limiting pressure value of barrier layer against the thickness of aluminum foil

Fig.9. Stress of different composite pipe structures against friction coefficient

Fig.10. Stress of different composite pipe structures against width of aluminum foil

Fig.11. Stress variation of different composite pipe structures with aluminum foil winding angle

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