Fatigue Delamination Behavior of GFRP Composites under Mixed-Mode I/II Loading

Document Type : Research Article


Department of Mechanical Engineering, Faculty of Engineering & Technology, International Islamic University, Islamabad, PAKISTAN


Delamination is a severe threat to the wide use of composite laminates in primary structural applications. Delamination grows under fatigue loading and leads to structural failure. Very few studies exist on mixed-mode delamination on carbon fiber however glass fiber was not studied under mixed mode. The objective of this paper is to investigate fatigue delamination growth under mixed-mode loading in Glass Fiber Reinforced Polymer (GFRP). A mixed-mode bending fixture was developed and fabricated. Fatigue delamination growth tests were performed for different mixed-mode loading using that fixture. With the help of a Scanning Electron Microscope, micro examinations of the crack surface were carried out. The results showed a high growth rate for the case with more contribution of mode I. The Fractographic investigation performed on the different samples showed the existence of mode-I and mode-II features and broken fiber’s confirming fiber bridging during delamination growth. The fractographic features varied systematically with mode shift.


[1] Aamir M., Tolouei-Rad M., Giasin K., Nosrati A., Recent Advances in Drilling of Carbon Fiber–Reinforced Polymers for Aerospace Applications: A Review, The International Journal of Advanced Manufacturing Technology, 105(5): 2289-2308 (2019).
[3] Wong K.J., Johar M., Koloor S.S.R., Petrů M., Tamin M.N., Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites, Polymers, 12(9): 2162 (2020).
[4] Nash N., Ray D., Young T., Stanley W., The Influence of Hydrothermal Conditioning on the Mode-I, Thermal and Flexural Properties of Carbon/Benzoxazine Composites with a Thermoplastic Toughening Interlayer, Composites Part A: Applied Science and Manufacturing, 76: 135-144 (2015).
[5] Johar M., Israr H.A., Low K.O., Wong K.J., Numerical Simulation Methodology for Mode II Delamination of Quasi-Isotropic Quasi-Homogeneous Composite Laminates, Journal of Composite Materials, 51(28): 3955-3968 (2017).
[6] Arani A. G., Abdollahian M., Kolahchi R., Nonlinear Vibration of Embedded Smart Composite Microtube Conveying Fluid Based on Modified Couple Stress Theory, Polymer Composites, 36(7): 1314-1324 (2015).
[7] Salehizadeh P., Taghizadeh M., Emam-Djomeh Z., Effect of Parameters on Fiber Diameters and the Morphology of Hybrid Electrospun Cellulose Acetate/Chitosan/Poly (Ethylene Oxide) Nanofibers, Iran. J. Chem. Chem. Eng. (IJCCE), 41(8): 2537-2547 (2022).
[8] Pascoe J. A., Alderliesten R. C., Benedictus R., Methods for the Prediction of Fatigue Delamination Growth in Composites and Adhesive Bonds–A Critical Review, Engineering Fracture Mechanics, 112: 72-96 (2013).
[9] Hosseini M.R., Taheri-Behrooz F., Salamat-Talab M., Mode I Interlaminar Fracture Toughness of Woven Glass/Epoxy Composites with Mat Layers at Delamination Interface, Polymer Testing, 78: 105943 (2019).
[10] Hosseini M. R., Taheri-Behrooz F., Salamat-Talab M., Mode II Interlaminar Fracture Toughness of Woven E-Glass/Epoxy Composites in the Presence of Mat Interleaves, International Journal of Adhesion and Adhesives, 98: 102523 (2020).
[11] Arani A.G., Kolahchi R., Hashemian M., Nonlocal Surface Piezoelasticity Theory for Dynamic Stability of Double-Walled Boron Nitride Nanotube Conveying Viscose Fluid Based on Different Theories, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 228(17): 3258-3280 (2014).
[12] Bennati S., Fisicaro P., Valvo P.S., An Enhanced Beam-Theory Model of the Mixed-Mode Bending (MMB) Test—Part I: Literature Review and Mechanical Model, Meccanica, 48(2): 443-462 (2013).
[13] Al-Furjan M., Shan L., Shen X., Zarei M., Hajmohammad M., Kolahchi R., A Review on Fabrication Techniques and Tensile Properties of Glass, Carbon, and Kevlar Fiber Reinforced Polymer Composites, Journal of Materials Research and Technology, (2022).
[14] Motezaker M., Kolahchi R., Rajak D.K., Mahmoud S., Influences of Fiber Reinforced Polymer Layer on the Dynamic Deflection of Concrete Pipes Containing Nanoparticle Subjected to Earthquake Load, Polymer Composites, 42(8): 4073-4081 (2021).