Fatigue crack propagation behavior of RC beams strengthened with CFRP under cyclic bending loads

Adhesive bonding has been extensively used to join composites and aluminium alloys in the automotive industry, but a deeper understanding of its fatigue behaviour is still required. This work presents a novel evaluation of the combined performance of joints manufactured with carbon fibre reinforced plastic (CFRP) and aluminium substrates subjected to fatigue loads in the unaged, hygrothermally aged, and dried after hygrothermal aging states. The experimental results allowed to conclude that the fatigue performance of joints can be affected by changes induced by the drying process or losses in the interface strength and that dissimilar combination of substrates sustains higher number of cycles to failure. The fatigue performance of joints with dissimilar substrates was found to be better than that of joints with similar substrates, which can be attributed to the lower stresses acting on the adhesive layer. The presence of water has also noticeably changed the fatigue performance of joints with dissimilar substrates.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue performance of single lap joints with CFRP and aluminium substrates prior and after hygrothermal aging

Machado

Marques

Barbosa

et al. 2019

“…[1][2][3][4] For FRP-reinforced RC bridge structures, on the one hand, the structures are served in the natural environment. [1][2][3][4] For FRP-reinforced RC bridge structures, on the one hand, the structures are served in the natural environment.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of RC beams strengthened with CFRP under coupling action of temperatures and vehicle random loads

Lin

Huang

Guo

et al. 2018

Self Cite

Considering significant influence of servicing environments and vehicle random loads on fatigue performance of main load‐bearing members of bridges, in this paper, fatigue performance of reinforced concrete bridge structures strengthened with carbon fibre–reinforced polymer under coupling action of environmental temperatures and vehicle random loads was studied. A vehicle random loading spectrum for fatigue tests was simulated and compiled. A fatigue testing method with coupling action of random loads and temperatures was proposed, and 3‐point bending fatigue tests of the reinforced concrete beams strengthened with carbon fibre–reinforced polymer under coupling action of temperatures and vehicle random loads were performed. Effects of temperatures and loading form on the fatigue damage mechanism were preliminarily discussed. A modified Palmgren‐Miner rule and semiempirical fatigue equations were proposed and proved effective.

“…To calculate the SIF of the cracks in RC members strengthened with FRP, this research group has previously applied theoretical derivation and the finite element, to solve SIF or J ‐integral of the cracks in RC beams strengthened with FRP, and has made a great progress. However, the calculation accuracy has yet to be improved, and the RC beams were strengthened with non‐prestressed FRP.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation behaviour of RC beams strengthened with prestressed CFRP under cyclic bending loads

Guo

Huang

et al. 2018

Self Cite

Numerical and experimental methods were applied to investigate the fatigue crack propagation behaviour of the reinforced concrete (RC) beams strengthened with prestressed carbon fibre laminate (CFL). On the one hand, a theoretical analysis method was presented to calculate the stress intensity factor K of the main crack on RC beam strengthened with prestressed CFL. On the other hand, fatigue crack propagation tests were carried out to obtain the crack propagation rate on RC beams strengthened with CFL, which had different prestressing levels (0%, 15%, and 22%). For accurate description of the fatigue crack propagation and fatigue life prediction, the digital image correlation method was used to capture the fatigue crack pattern. Based on the numerical and experimental method, a modified version of Paris' law was proposed. Compared with RC beams strengthened with nonprestressed CFL, the main crack propagation rates on RC beams strengthened with prestressed CFL having prestressing levels of 15% and 22% were decreased by 28% and 33%, respectively. The effectiveness of the proposed modified version of Paris' law was verified.