Behavior of cracked steel plates strengthened with adhesively bonded CFRP laminates under fatigue Loading: Experimental and analytical study

Doroudi, Yashar; Fernando, Dilum; Hosseini, Ardalan; Ghafoori, Elyas

doi:10.1016/j.compstruct.2021.113816

Cited by 30 publications

(8 citation statements)

References 66 publications

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“…The steel structure is widely used in modern engineering structures, such as marine and civil engineering, because of its advantage of lightweight, high strength, and convenient processing. 1 Fatigue is one of the main concerns of failure of steel structures. Further, it has attracted much attention in civil engineering industry.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Ke,

Chen,

Feng

et al. 2024

Polymer Composites

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Carbon fiber‐reinforced polymer (CFRP) is increasingly used to improve the fatigue behavior of damaged steel structures due to its advantages, including high strength and convenient processing. However, several issues, such as the effects of the adhesive property and CFRP arrangement, still need to be studied. In this study, a total of 20 single‐cracked steel specimens were tested under fatigue load, including two unstrengthened specimens, six single‐sided strengthened specimens, and 12 double‐sided strengthened specimens. The failure mode, fatigue life, crack propagation pattern, and interface damage development were obtained from experiments. The results show that epoxy resin structural adhesives (adhesives Araldite 420 and J133C) have the best bonding properties with CFRP. For the conventional epoxy adhesives, Araldite 420 and J133C can considerably improve fatigue life, which increased by more than 44.84 times to unstrengthened specimens. CFRP plate strengthening can significantly improve the fatigue life of single‐edge cracked steel plates. For the double‐sided strengthened specimens, the fatigue life can be improved by 6.93–44.84 times that of unstrengthened specimens. For the single‐sided, the fatigue life can be improved by 2.24–2.77 times. Properties of epoxy adhesive have a more significant effect on fatigue life compared to the thickness of the CFRP plate due to debonding.Highlights Ductile epoxy adhesives are most conducive to improving the fatigue behavior of CFRP strengthened steel plates. The fatigue life of steel plates can be improved by increasing the thickness of CFRP plates and using double‐sided CFRP strengthening. Interface debonding is the main failure mode of CFRP plates strengthening single‐edge cracked steel plates under fatigue.

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Section: Introductionmentioning

confidence: 99%

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Ke,

Chen,

Feng

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Different criteria have been developed based on fracture mechanics, including the J-integral method, 1 theory of critical distance (TCD), 2 and averaged strain energy density (ASED). 3 Studies on the fracture mechanics of various engineering materials as metals, 4 polymers, 5 fibrous composites, 6 and so on have been performed comprehensively by the researchers.…”

Section: Introductionmentioning

confidence: 99%

Active control of stress intensity in the cracked 3D‐printed specimens using shape memory alloy wires

Ameri

Taheri‐Behrooz

2023

Fatigue Fract Eng Mat Struct

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Intelligent composite structures are designed to retard crack initiation and growth in a controlled manner using shape memory alloys (SMAs). The crack closure under mixed‐mode I/II conditions in the 3D‐printed specimens reinforced with pre‐strained SMAs is investigated using numerical, analytical, and experimental procedures. The stress intensity factors (SIFs) of the semicircular bending (SCB) samples are theoretically estimated based on the micromechanical model where the wires are entirely perpendicular to the crack planes, and findings are verified with those data obtained using numerical and experimental methods. Stable crack growth, interlayer adhesion, and fracture toughness improvement are obtained in the modified test samples. In terms of strength and fracture toughness, SMA with 1% pre‐strain is introduced as an optimal value in both pure mode I and mixed‐mode I/II conditions.

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“…If maintenance and reinforcement measures are not taken, they will eventually form through cracks that endanger driving safety. Carbon Fiber Reinforced Polymer (CFRP) has advantages such as high specific strength, high specific modulus, high strength, good fatigue resistance, strong designability, good high-temperature performance, good formability, and convenient adhesion [10][11][12]. In recent decades, the application of CFRP materials to reinforce steel structural components has become an effective choice for meeting increasing cyclic loads or repairing due to fatigue cracking.…”

Section: Introductionmentioning

confidence: 99%

A Study on Fatigue Crack Reinforcement of Bridge Deck and U-Rib Weld after Considering Residual Stress

Hao,

Ming

2023

Applied Sciences

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In order to study the fatigue performance of the initial crack between the CFRP reinforced deck and the U-rib weld after considering the residual stress, the welding residual stress of the deck and the U-rib weld was analyzed by the welding subprogram of ABAQUS, and then the segment model of the deck and the U-rib of the steel bridge deck was established by using the interaction technology of FRANC 3D-ABAQUS, and the stress intensity factor of the crack between the deck and the U-rib weld under the vehicle-only, vehicle-residual stress combined loads, and CFRP-strengthened combined loads were analyzed. The growth analysis of cracks before and after reinforcement was carried out. The results show that the amplitude of the stress intensity factor of the crack tip is less than the threshold when only the vehicle is applied, and the crack will not spread. After considering the residual stress, the maximum KI value of the crack at the welding toe is increased by 6.9 times compared with the maximum value of the vehicle only, and the maximum KI value at the welding root is increased by 10.7 times; the reinforcement method of CFRP pasted on the lower surface has a reinforcement effect on the fatigue crack at the welding toe, but the fatigue crack at the welding root has no reinforcement effect; the reinforcement effect of the welded toe crack increases with the increase of the number of CFRP layers, length, and width. When the weld toe crack after reinforcement extends to half the thickness of the deck, the number of car-residual stress combined load cycles increases by 43% compared to when it is not reinforced.

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Behavior of cracked steel plates strengthened with adhesively bonded CFRP laminates under fatigue Loading: Experimental and analytical study

Cited by 30 publications

References 66 publications

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Active control of stress intensity in the cracked 3D‐printed specimens using shape memory alloy wires

A Study on Fatigue Crack Reinforcement of Bridge Deck and U-Rib Weld after Considering Residual Stress

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