Abstract
A pultruded unidirectional carbon/glass reinforced epoxy hybrid FRP rod with 19 mm of diameter was developed for a sucker rod and lifting oil wells. The rod possesses a 12-mm diameter carbon fiber core and a 3.5-mm thick outer shell. The rod was exposed to high-temperature immersion in water under hydraulic pressure. To understand the long-term service performance of the rod, immersions in water at 20 °C, 40 °C, or 60 °C under 20 MPa of pressure for 1 year were conducted on the water uptake and distribution in the rod. The water uptake data were fitted by Fickian diffusion law, and the diffusion coefficient and the maximum water uptake were derived. Water distribution in the rod as a function of the immersion time, temperature, and hydraulic pressure was analyzed theoretically. This study revealed the accelerating effects of the elevated temperatures and the hydraulic pressure on the water diffusion in the hybrid rod.
Highlights
Fiber-reinforced polymer (FRP) composites possess many advantages, e.g., low-weight, high specific strength and specific stiffness, convenience of installation, and superior fatigue resistance, especially for carbon FRPs (CFRPs) [1]
FRPs have been widely used in various industry fields as a competitive alternative to traditional materials, such as steel [2]
4and shows thewith water uptake the square root immersion time at 20 ◦ C, 40 point
Summary
Fiber-reinforced polymer (FRP) composites possess many advantages, e.g., low-weight, high specific strength and specific stiffness, convenience of installation, and superior fatigue resistance, especially for carbon FRPs (CFRPs) [1]. To make full use of the tensile properties and long-term durability of FRPs, recently, FRPs have found some new applications, such as sucker rods for lifting oil wells, submarine structures, subsea oil industry use, and as oceanographic profilers as load-bearing bars or rods to replace the steel materials [4,5,6]. For such novel applications, the long-term properties of FRPs under complex service conditions (e.g., high temperatures, hydraulic pressure, etc.)
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