Experimental Research on Fatigue Performance of Bent Steel Plates with Surface Cracks Using Externally Bonded Reinforcing Plates
To explore the fatigue performance of surface-cracked bent steel plates with different reinforcing materials,fatigue loading tests were conducted on Q345 steel plates with surface cracks using Carbon Fiber Reinforced Polymer(CFRP)plates and steel plates as reinforcement schemes.The effects of initial crack size,reinforcing plate thickness,and bonding methods on the reinforcement performance were analyzed.During the tests,the depth and length of crack propagation were measured using an ultrasonic flaw detec-tor,and the crack propagation process in the steel plates was simulated by using the Extended Finite Ele-ment Method(XFEM).The results showed that both CFRP plates and steel plates could effectively extend the fatigue life of the damaged steel plates and suppress crack propagation.When double-layered reinfor-cing plates were used,delamination failure occurred,affecting the reinforcement effect.Therefore,it was recommended to use a single-layer bonding method for reinforcement.The reinforcement effect of CFRP plates was superior to that of steel plates,and increasing the thickness of the reinforcing plates further en-hanced the reinforcement effect.Reinforcement was significantly more effective on damaged steel plates with larger initial cracks compared to those with smaller initial cracks.The fatigue life and crack length ob-tained from XFEM simulation of crack propagation were consistent with the experimental results.
万方数据
维普
