Analytical Study of Fatigue Crack Growth Behavior of Steel Structure Reinforced with FRP

Document Type : Original Article

Authors

1 SJB Institute of Technology

2 Kengari Dr Vishnuvardhan Rd, 5th Block, Phase 3, Banashankari, Bengaluru, Karnataka, India

10.22115/cepm.2022.351723.1216

Abstract

The using up of fiber reinforced polymer (FRP) in retrofit and repair in industrial fields is extremely efficient and also capable in increasing service life cycle of the structures. In this paper the investigation on the FRP repairing on crack surface of S235 steel plate which is subjected to tension loading has been carried out. The variation in stress intensity factor (SI) around the crack on the surface of steel plate, is analytically investigated and crack growth rate for steel plate was estimated by considering the stress intensity factor value in the Paris-Erdogan equation. Results recommended that laminate made of carbon fiber reinforced polymer (CFRP) repaired on the crack surface is the most effective one   which showed decreased stress intensity value of 328.9Mpa.mm0.5, whereas the unreinforced steel plate with SIF value 389.29Mpa.mm0.5. Compare to the glass FRP with high elasticity modulus, it showed decrease in SIF value 326.95Mpa.mm0.5, results showed that 15-20% reduction in stress intensity (SI) factor when it compares with bare steel plate and with FRP reinforced plate. Finally results showed that reinforcement of FRP on the cracked surface of the steel structure yield good results as increasing its fatigue life by decreasing the expansion of crack at its tip.

Keywords

Main Subjects


[1]      Colombi P, Fava G, Sonzogni L. Fatigue crack growth in CFRP-strengthened steel plates. Compos Part B Eng 2015;72:87–96. https://doi.org/10.1016/j.compositesb.2014.11.036.
[2]      Zhao CY, Huang PY, Zhou H, Zheng XH. Numerical Analysis of KI of Semi-Elliptical Surface Crack in Steel Structure Strengthened with FRP under Tensile Load. Appl Mech Mater 2011;137:42–9. https://doi.org/10.4028/www.scientific.net/AMM.137.42.
[3]      Li Z, Jiang X, Hopman H, Zhu L, Liu Z, Tang W. Experimental investigation on FRP-reinforced surface cracked steel plates subjected to cyclic tension. Mech Adv Mater Struct 2021;28:2551–65. https://doi.org/10.1080/15376494.2020.1746448.
[4]      Li Z, Jiang X, Hopman H. External surface cracked offshore pipes reinforced with composite repair system: A numerical analysis. Theor Appl Fract Mech 2022;117:103191. https://doi.org/10.1016/j.tafmec.2021.103191.
[5]      Lin X. numerical simulation of fatigue crack growth a thesis submitted for the DCBTFEE of doctor of philosophy at the university of Sheffield. n.d.
[6]      Emdad R, Al-Mahaidi R. Effect of prestressed CFRP patches on crack growth of centre-notched steel plates. Compos Struct 2015;123:109–22. https://doi.org/10.1016/j.compstruct.2014.12.007.
[7]      Lepretre E, Chataigner S, Dieng L, Gaillet L. Fatigue strengthening of cracked steel plates with CFRP laminates in the case of old steel material. Constr Build Mater 2018;174:421–32. https://doi.org/10.1016/j.conbuildmat.2018.04.063.
  • Receive Date: 14 July 2022
  • Revise Date: 02 November 2022
  • Accept Date: 26 December 2022
  • First Publish Date: 26 December 2022