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2016, vol. 57, iss. 1, pp. 110-118
Influence of acidic solutions on the strain distribution in glasspolyester composite pipes subjected to internal pressure
aMilitary Technical Institute - MTI, Belgrade
bUniversity of Belgrade, Faculty of Technology and Metallurgy
cBelgrade Polytechnic, Belgrade

emailslavisa@tmf.bg.ac.rs
Project:
Study of the Synthesis, Structure and Activity of Natural and Synthetic Organic Compounds (MESTD - 172013)
Micromechanical criteria of damage and fracture (MESTD - 174004)

Keywords: glass-polyester composite; internal pressure; influence of solution; fiber reinforced pipes
Abstract
The basic subject of this paper was the determination of the strain distribution in glass-polyester composite pipes subjected to internal pressure. Firstly, the test was performed on virgin pipe segments (without the influence of acidic solution) to determine the original properties of the examined composite pipes. Subsequently, the pipes were subjected to the influence of 25% acidic solution. Phosphoric and nitric acid were chosen, because of their frequent use in chemical industry, either as reactants or as products. The pipes were made by 'filament winding' method, with the angles of the glass fibers reinforcement [90°]2[±55°]4[90°]4. The tests were performed by subjecting the polymer composite pipes to internal pressure; the strain values were determined by strain gages in three directions: 0°, 90° and ± 45° with respect to the pipe axis. The tests were performed until the leakage occurred, up to the pressure value of approximately 100 bar, i.e. until the occurrence of the first cracks. Also, the micromechanical analysis on fracture surfaces was done by Scanning Electron Microscopy (SEM), which provided the knowledge about models and mechanisms of fracture due to the applied loading.
References
*** (2001) SRPS ISO Standard 1167: Thermoplastics pipes for the conveyance of fluids: Resistance to internal pressure: Test method
*** ASTM D3039 / D3039M - 14: Standard test method for tensile properties of polymer matrix composite materials
Flueler, P., Farshad, M. (1995) Arrest of rapid crack propagation in polymer pipes. Materials and Structures, 28(2): 108
Guan, Z.W., Boot, J.C. (2001) Creep analysis of polymeric pipes under internal pressure. Polym Eng Sci, 41(6); 955-961
Hammami, A., Al-Ghuilani, N. (2004) Durability and environmental degradation of glass-vinylester composites. Polymer Composites, 25(6): 609-616
Mahmoud, M.K., Tantawi, S.H. (2003) Effect of strong acids on mechanical properties of glass/polyester GRP pipe at normal and high temperatures. Polymer-Plastics Technology and Engineering, 42(4), 677-688
Mouallif, I., Latrach, A., Chergui, M., Benali, A., Elghorba, M., Mouallif, Z., Hangouet, J.-P., Barbe, N. (2013) Degradation of dynamic mechanical properties of glass fiber reinforced polyester composite pipes after immersion in various temperatures. Journal of Composite Materials, 48(24): 3025-3034
Sindhu, K., Joseph, K., Joseph, J.M., Mathew, T.V. (2007) Degradation studies of coir fiber/polyester and glass fiber/polyester composites under different conditions. Journal of Reinforced Plastics and Composites, 26(15), 1571-1585
Stamenović, M., Putić, S., Rakin, M., Medjo, B., Čikara, D. (2011) Effect of alkaline and acidic solutions on the tensile properties of glass-polyester pipes. Materials & Design, 32(4): 2456-2461
Stamenović, M., Putić, S., Medjo, B., Rakin, M., Zrilić, M. (2012) Effect of solution pH on crack initiation and propagation in glass-polyester pipes subjected to impact. Polymer Composites, 33(8): 1321-1328
 

About

article language: English
document type: Scientific Paper
DOI: 10.5937/ZasMat1601110T
published in SCIndeks: 11/06/2016

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