Interaction between plasticity and damage in the behaviour of [+ φ , − φ ] n fibre reinforced composite pipes in biaxial loading (internal pressure and tension)

The aim of this research is to study the behavior of fiber epoxy composite curve pipe under internal pressure and bending moment. The specimens made from woven roving (Mat) fiber glass pipes and epoxy composite with 50% volume fraction are used to manufacturing curved pipe. The experimental work included manufacturing pipe specimens by vacuum bag technique. Pipe specimens were having 100mm inner diameter, 450 mm length of curvature center line of curve pipe with (43 degree) and two wall thickness are 4 and 3 mm. The test rig was designed and performed to study the effect of internal pressure and bending moment on the composite pipes. Also, the tensile test of the samples was done. The analytical expression solution has been accomplished to determine the strain, stress, for hoop and longitudinal direction. It is evident that the hoop stress for woven roving fiber composite pipe was more than longitudinal stress by almost (14%). The maximum internal pressure in the case of internal pressure only was more than compared to the combined internal pressure with bending moment by almost (115%). The most dangerous region is found in the inner arc of the curved pipe (intrude) area.

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Hygrothermal Ageing of Glass Reinforced Composite Pipes

Mechanics of Composite Materials and Structures ◽

10.1007/978-94-011-4489-6_17 ◽

1999 ◽

pp. 299-308

Author(s):

A. Cervenka

Keyword(s):

Reinforced Composite ◽

Hygrothermal Ageing ◽

Composite Pipes

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Effects of Thickness and Winding Angle of the Laminate on Internal Pressure Capacity of Thermoplastic Composite Pipes

Volume 4: Pipelines, Risers, and Subsea Systems ◽

10.1115/omae2020-18046 ◽

2020 ◽

Author(s):

H. Xia ◽

C. Shi ◽

J. Wang ◽

X. Bao ◽

H. Li ◽

...

Keyword(s):

Internal Pressure ◽

Oil And Gas ◽

Solid Wall ◽

Three Dimensional ◽

Oil And Gas Industry ◽

Thermoplastic Composite ◽

Critical Parameters ◽

Element Analysis ◽

Composite Pipes ◽

Winding Angle

Abstract Thermoplastic composite pipes (TCPs) are increasingly used to transport hydrocarbons and water in the oil and gas industry due to their superior properties including corrosion resistance, thermal insulation, light weight, etc. The cross-section of TCPs generally consists of three layers: inner liner, composite laminate, and outer jacket. Three layers are bonded together and form a solid-wall construction. Inner liner and outer jacket made of thermoplastic polymer provide protective barriers for the laminate to against the inner fluid and outer environment. The laminate is constructed by an even number of helically wounded continuous fiber reinforced thermoplastic composite tapes. In this study, mechanical behaviors of a TCP under an internal pressure were investigated by using analytical and finite element analysis (FEA) methods. The analytical method which is based on the three-dimensional (3D) anisotropy elastic theory can take account of non-uniformly distributed stress and strain through the thickness of the pipe wall. FEA models were setup by using the software ABAQUS to predict the stress distribution of the pipe. 3D Tsai-Wu failure criterion was used to predict the maximum internal pressure of the pipe. Effects of some critical parameters, such as the winding angle of composite tapes and the number of reinforced plies, on the internal pressure capacity of TCPs were studied. Results obtained from the analytical and FEA methods were fairly agreed with each other, which showed that with the increasing of the number of reinforced plies the internal pressure capacity of a TCP gradually increases and approaches to an extreme value. In addition, the optimal winding angle which results the maximum internal pressure is not a constant value, instead, it varies with the increasing thickness of the laminate layer. This study provides useful tools and guidance for the design and analysis of TCPs, and is currently under validation through experiments.

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Analysis of the compression behavior of an E-glass composite pipe after aging in water

Polymers and Polymer Composites ◽

10.1177/0967391119895735 ◽

2019 ◽

Vol 28 (8-9) ◽

pp. 523-529

Author(s):

José RM d’Almeida ◽

Leonardo M Ottolini

Keyword(s):

Mechanical Response ◽

Damage Parameter ◽

Effect Of Temperature ◽

Glass Composite ◽

Composite Surface ◽

Compression Behavior ◽

Reinforced Composite ◽

Temperature And Pressure ◽

Composite Pipes ◽

Surface Gloss

E-glass-reinforced composite pipes are being increasingly used in petrochemical facilities. After years of contact with the fluid being transported, the mechanical integrity of the pipes can be compromised, and their failure mode can be altered. This work analyzes the effect of temperature and pressure on the compressive behavior of an E-glass pipe after exposure to water. The results indicate that temperature causes more damage than pressure on the mechanical response of the composite. A macroscopic damage parameter quantified the effect on the mechanical behavior of the composite. Surface gloss changes were also correlated with the effects caused by aging.

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