Tensile Strength Alteration of GFRP Composite Pipes Under Seawater-Dominated Conditions
- PDF / 700,081 Bytes
- 5 Pages / 595.276 x 790.866 pts Page_size
- 64 Downloads / 174 Views
TECHNICAL ARTICLE—PEER-REVIEWED
Tensile Strength Alteration of GFRP Composite Pipes Under Seawater-Dominated Conditions Alper Gunoz . Yusuf Kepir . Memduh Kara
Submitted: 7 February 2020 ASM International 2020
Abstract Glass fiber-reinforced epoxy composite pipes are used in submarine applications, natural gas, and oil transportation lines, transfer of chemical liquids. Especially in the transport of pressurized fluids, changes in the strength of the pipes are important. The corrosive effect of seawater has an important impact on the mechanical properties of the composite material. In particular, the alteration in hoop tensile strength is one of the issues to be investigated. In this experimental study, glass fiber-reinforced epoxy resin composite pipes were exposed to the seawater aging process for different time periods (1, 2 and 3 months) in order to determine the effects of seawater absorption behavior on hoop tensile strength. Hoop tensile strength test was realized in accordance with ASTM D2290 Procedure A. As a result of this work, the average tensile strength values of the composite pipes decreased as the waiting times in seawater increased. Keywords Composite pipes Seawater effect Mechanical properties Hoop strength
Introduction In these days, filament wound GFRP composite pipes have been extensively used for the transportation of liquids, such as water, corrosive fluids, oil, and natural gas [1, 2]. Composite pipes have high specific strength and hardness A. Gunoz (&) Y. Kepir M. Kara Department of Mechanical Engineering, Engineering Faculty, Mersin University, Yenisehir, Mersin, Turkey e-mail: [email protected] Y. Kepir e-mail: [email protected]
properties, as well as good fatigue and corrosion resistance [3–5]. Glass fiber composite pipes have a longer life against shocks caused by sudden internal pressure changes due to the lower elasticity modulus than other pipes [6]. Glass fiber-reinforced epoxy composite pipes may be exposed to environmental conditions such as humidity, distilled water, seawater, rainwater, acidic solution, sun, and wind. These conditions give rise to a significant disruption of the mechanical characteristics of the composite materials [7, 8]. In order to determine the effect of different environmental conditions on composite pipes and to prevent or minimize the deformation of this effect on the material, it is necessary to know the mechanical properties of the pipes under different environmental conditions. Seawater creates two macroscopic effects in the form of deterioration of mechanical properties in composite materials and weight gain of the material [9]. Generally, composites perform water absorption in the presence of water due to their hydrophilicity behavior [10]. This absorbed water causes the material to swell and permanently deform. Thus, the mechanical properties of the material are weakened [11, 12]. The capillarity and hydrophilic group located in the glass fiber cause the acceleration of water absorption with longer immersion time [13, 14]
Data Loading...
