Analysis of Fiber-Reinforced Polymer (FRP) Rehabilitation of Cracked Pressure Vessel Using Finite-element Method (FEM)

Document Type : Original Research Paper


1 Department of Mechanical Engineering, Velayat University, Iranshahr, Iran.

2 Ilam Gas Company, Ilam, Iran.


Investigation of repaired crack in pressure vessels plays a critical role in the maintenance of cylindrical vessels which are under static loads. Pressurized vessels are critical elements in many industries that may be subjected to degradation and cracking due to working conditions. There are several methods to repair such reservoirs, including welding of damaged points, but this is not possible in some conditions, such as the presence of inflammable materials inside the reservoir. One of the most reliable ways to repair these types of vessels is using composite materials. In this research, crack created in the reservoir is repaired using carbon / epoxy composites. Results of this study confirm the association between the strength of vessels walls and thickness of composite materials. In this paper, the effect of different parameters such as thickness and radius of the reservoir, and composite thickness are investigated. The results show that increasing the thickness of the composite is effective, so by doubling the thickness of composite, stress intensity factor decreases by 13%. Moreover, the use of composites in thin wall tanks is much more effective than the case of a thick reservoir wall.


[1] X. Qian, KI-T estimation for embedded flaws in pipes–Part II: Circumferentially oriented cracks, Int. J. Press. Vessels Pip., 87(4) (2010) 150-164.
[2] U. Meier, Carbon fiber-reinforced polymers: modern materials in bridge engineering, Struct. Eng. Int., 2(1) (1992) 7-12.
[3] A. Sabik, I. Kreja, Stability analysis of multilayered composite shells with cut-outs, Arch. Civ. Mech. Eng., 11(1) (2011) 195-207.
[4] J. Ramaniah, K. Jagan, M. Rao, Buckling analysis of orthotropic composite shell with and without cutouts using fem, Int. J. Eng. Technol., 2(8) (2013) 2042-2049.
[5] J. Lukács, G. Nagy, I. Török, J. Égert, B. Pere, Experimental and numerical investigations of external reinforced damaged pipelines, Procedia Eng., 2(1) (2010) 1191-11200.
[6] H. Allahbakhsh, M. Shariati, Buckling of Cracked laminated composite cylindrical shells subjected to combined loading, Appl. Compos. Mater., 20(5) (2013) 761-772.
[7] M.A. Ghaffari, H. Hosseini-Toudeshky, Fatigue crack propagation analysis of repaired pipes with composite patch under cyclic pressure, J. Pressure Vessel Technol., 135(3) (2013) 031402.
[8] H. Hosseini-Toudeshky, E. Fadaei, Effects of composite patch geometry on collapse load of pressurized steel pipes with internal longitudinal flaws, Appl. Mech. Mater., 152-164 (2012) 381-386.
[9] A. Shavalipour, R. Karimi, Parametric investigation of repairing cracked pressure vessel using composite patch, Journal of Engineering Science Technology Review, 12(4) (2019) 136-143.
[10] M. Meriem-Benziane, S.A. Abdul-Wahab, H. Zahloul, B. Babaziane, M. Hadj-Meliani, G. Pluvinage, Finite element analysis of the integrity of an API X65 pipeline with a longitudinal crack repaired with single-and double-bonded composites, Composites, Part B, 77 (2015) 431-439.
[11] H.A. Pierson, E. Celik, A. Abbott, H. De Jarnette, L.S. Gutierrez, K. Johnson, H. Koerner, J.W. Bour, Mechanical properties of printed epoxycarbon fiber composites, Exp. Mech., 59 (2019) 843-857.