Stress and failure analyses of thermoplastic composite pipes subjected to torsion and thermomechanical loading

2021 ◽  
Vol 79 ◽  
pp. 103024
Author(s):  
Yangye He ◽  
Murilo Augusto Vaz ◽  
Marcelo Caire
Keyword(s):  
Thermoplastic Composite ◽  
Thermomechanical Loading ◽  
Composite Pipes

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

2021 ◽  
Author(s):  
Heping Xia ◽  
Chen Shi ◽  
Jialu Wang ◽  
Xingxian Bao ◽  
Hongwei Li ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Thermoplastic Composite ◽  
Composite Pipes ◽  
Winding Angle

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

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.

Thermoplastic Composite Pipes: A Reliable Cost-Effective Solution for Pre-salt

2019 ◽  
Author(s):  
Teofilo Barbosa ◽  
Renato Bastos ◽  
Henk De Boer ◽  
Ramón Rojas-Díaz
Keyword(s):  
Cost Effective ◽  
Thermoplastic Composite ◽  
Effective Solution ◽  
Composite Pipes

Numerical Evaluation on Lateral Impact Resistance of Thermoplastic Composite Pipes in Terms of Internal Pressure Capacity

2020 ◽  
Author(s):  
J. Wang ◽  
C. Shi ◽  
G. Fu ◽  
Z. Liu ◽  
X. Bao ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Minimum Energy ◽  
Impact Resistance ◽  
Thermoplastic Composite ◽  
Economic Losses ◽  
Lateral Impact ◽  
Composite Pipes ◽  
Subsea Pipelines ◽  
The Impact ◽  
Static Simulation

Abstract Subsea pipelines are prone to be damaged by the falling objects from ships or offshore platforms, which may result in economic losses and pollution. The dimensions of dent were commonly used to evaluate the impact resistance of pipes made from carbon steel. Thermoplastic composite pipes (TCPs), due to their superior properties including corrosion resistance, thermal insulation, fast installation, etc., are increasingly used as the subsea pipelines. The TCP is made from thermoplastic resins and reinforced by continuous fibers. Because of the brittle nature of carbon fibers and glass fibers, the dimensions of dent are not suitable for assessment of impact resistance of a TCP. In the present work, a procedure was proposed using the internal pressure capacity as an indicator to evaluate the lateral impact resistance of a TCP. First, the internal pressure capacity of an intact TCP was evaluated. Second, a quasi-static simulation was conducted by applying a lateral compression force on the intact TCP using a rigid ball, until one of the composite plies in the reinforcement layer failed. The quasi-static simulation provided an initial estimate of the minimum energy that causes the start of damage of the TCP. Third, the impact simulations were performed by using a rigid ball hitting the TCP and, then, the internal pressure capacity of the damaged TCP was evaluated. Finally, the internal pressure capacity of the damaged pipe, compared with that of the intact pipe, was used as an indicator to evaluate the lateral impact resistance of the TCP. In this study, a glass-fiber reinforced polyethylene (PE) pipe of an inner diameter of 150 mm was modeled by ABAQUS to illustrate the procedure. A theoretical method was proposed to calculate the impact energy of a dropped object in a shallow water. The example studied in the present work showed that the modeled TCP was not strong enough to survive the lateral impact caused by the dropped object and should be buried to a certain depth beneath the seabed if used as a subsea pipeline.

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