Impact of sea-water on the quasi static and fatigue flexural properties of GFRP

Abstract Glass fiber reinforced plastic (GFRP) composite material is often utilized in marine applications for the construction of boats and ships. In this application it is a usual procedure to protect the material with a layer of gel-coat, but if the gel-coat breaks the material would be in direct contact with a humid environment. The main objective of this study was to understand the degradation that sea-water causes on GFRP mechanical properties. The article deals with two common resin systems in marine applications, i.e. polyester and vinylester, and reports the results of quasi-static and vibration tests at different sea-water exposure times, and fatigue tests in dry and wet environments of unexposed specimens and specimens aged in sea water for 22-weeks. The results show degradation of the material in terms of ultimate stress in the case of quasi-static loading, and no appreciable degradation on the fatigue loading case. Vibration tests demonstrated a stable flexural modulus during the water exposure period.

[1]  Adrian P. Mouritz,et al.  Seawater durability of glass- and carbon-polymer composites , 2004 .

[2]  G. Minak.  On the Determination of the Fatigue Life of Laminated Graphite-Epoxy Composite by Means of Temperature Measurement , 2010 .

[3]  A. Visco,et al.  Comparison of seawater absorption properties of thermoset resins based composites , 2011 .

[4]  A. Mourad,et al.  Effect of Seawater and Warm Environment on Glass/Epoxy and Glass/Polyurethane Composites , 2010 .

[5]  Tinh Nguyen,et al.  Sorption and diffusion of water, salt water, and concrete pore solution in composite matrices† , 1999 .

[6]  Masayuki Nakada,et al.  Accelerated Testing for Long-term Durability of FRP Laminates for Marine Use , 2005 .

[7]  L. Brinson,et al.  Effect of water on the fatigue behavior for a pultruded glass-reinforced composite , 1998 .

[8]  Marcus Schneider,et al.  The combined effects of load, moisture and temperature on the properties of E-glass/epoxy composites , 2005 .

[9]  R. Adams,et al.  The dynamic properties of fibre-reinforced polymers exposed to hot, wet conditions , 1996 .

[10]  T. Czigány,et al.  A Study of Water Absorption and Mechanical Properties of Glass Fiber/Polyester Composite Pipes — Effects of Specimen Geometry and Preparation , 2008 .

[11]  Polycarpos Pissis,et al.  Water sorption and diffusion studies in an epoxy resin system , 1999 .

[12]  R. Gaertner,et al.  Influence of hydrolytic ageing on the acoustic emission signatures of damage mechanisms occurring during tensile tests on a polyester composite: Application of a Kohonen’s map , 2006 .

[13]  F. Ellyin,et al.  The Influence of Aqueous Environment, Temperature and Cyclic Loading on Glass-Fibre/Epoxy Composite Laminates , 2003 .

[14]  Andrea Zucchelli,et al.  Fatigue residual strength of circular laminate graphite–epoxy composite plates damaged by transverse load , 2009 .

[15]  M. Ahmadi,et al.  Acoustic Emission based on sentry function to monitor the initiation of delamination in composite materials , 2011 .

[16]  S. Aldajah,et al.  Impact of humidity on the durability of E-glass/polymer composites , 2009 .

[17]  E. Pérez-Pacheco,et al.  Effect of moisture absorption on the micromechanical behavior of carbon fiber/epoxy matrix composites , 2011, Journal of Materials Science.

[18]  Huang Gu,et al.  Dynamic mechanical analysis of the seawater treated glass/polyester composites , 2009 .

[19]  C. Papaspyrides,et al.  Polyamide coated glass fabric in polyester resin: interlaminar shear strength versus moisture absorption studies , 1998 .

[20]  F. Thominette,et al.  Factors governing water absorption by composite matrices , 2002 .

[21]  A. Naceri.  An analysis of moisture diffusion according to Fick’s law and the tensile mechanical behavior of a glass-fabric-reinforced composite , 2009 .

[22]  Ivo Černý,et al.  Evaluation of static and fatigue strength of long fiber GRP composite material considering moisture effects , 2010 .

[23]  Moussa Karama,et al.  Damage evolution and infrared thermography in woven composite laminates under fatigue loading , 2006 .

[24]  A. Gibson,et al.  Environmentally enhanced fatigue damage in glass fibre reinforced composites characterised by acoustic emission , 2000 .

[25]  L. C. Pardini,et al.  Processing and hygrothermal effects on viscoelastic behavior of glass fiber/epoxy composites , 2005 .

[26]  Andrew G. Dickson,et al.  Handbook of methods for the analysis of the various parameters of the carbon dioxide system in sea water. Version 2 , 1994 .

[27]  Andrea Zucchelli,et al.  An integrated approach based on acoustic emission and mechanical information to evaluate the delamination fracture toughness at mode I in composite laminate , 2011 .

[28]  S. Lakkad,et al.  Effect of salt water on mechanical properties of fibre reinforced plastics , 1983 .

[29]  S. Cabral-Fonseca,et al.  Durability of pultruded glass-fiber-reinforced polyester profiles for structural applications , 2006 .

[30]  D. M. Turley,et al.  Seawater immersion ageing of glass-fibre reinforced polymer laminates for marine applications , 1999 .

[31]  L. C. Pardini,et al.  Hygrothermal effects on damping behavior of metal/glass fiber/epoxy hybrid composites , 2005 .

[32]  S. Zhang,et al.  E-Glass/Vinylester Composites in Aqueous Environments – I: Experimental Results , 2003 .