Experimental Study on Fatigue Cracked Steel Plates Under Mode (I) and Mixed-Modes (I/II) Repaired with CFRP and Stop Hole

This paper discusses the behavior of cracked steel plates in mixed cracking modes I/II, repaired using CFRP (Carbon Fiber Reinforced Polymer) materials and a stop hole under fatigue loading conditions. The study aims to evaluate the effectiveness of CFRP and stop holes as a repair method for enhancing the fatigue resistance of cracked steel structures. The experimental was tested under eccentric axial fatigue cyclic loading till failure in pure mode I and mixed mode (I/II) with a 45° angle. It was found that from test results, the fatigue life of steel plates strengthened with CFRP increased by 1.4 times when compared to un-strengthened steel plates. The fatigue life of steel plates strengthened with a stop hole increased by a factor of 1.45 compared to un-strengthened steel plates. The fatigue life of steel plates strengthened with CFRP and stop hole increased by a factor of 1.49 compared to un-strengthened steel plates.