Irreversible cyclic cohesive zone model for prediction of mode I fatigue crack growth in CFRP-strengthened steel plates

Mohajer, Mana; Bocciarelli, Massimiliano; Colombi, Pierluigi; Hosseini, Ardalan; Nussbaumer, Alain; Ghafoori, Elyas

doi:10.1016/j.tafmec.2020.102804

Cited by 24 publications

(6 citation statements)

References 34 publications

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“…A notch is prefabricated in the center of the left edge which is 10 mm in size. Refer to references [24], the mechanical properties of steel S355J2+N are shown in table 1 and the cohesion unit parameters is listed in table 2. This paper uses a custom subroutine to insert the cohesion unit.…”

Section: Materials Parametersmentioning

confidence: 99%

Simulation of crack growth for metal plates with holes based on cohesive zone model

Ma¹,

Song²,

Zhang³

et al. 2022

Mater. Res. Express

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Hole defects are very common in metal plates. The propagation of cracks in engineering structural members will be affected by the holes of the members, which will not only change the propagation direction of cracks, but also have the ability to limit the growth of cracks. Therefore, the study of material fracture crack propagation caused by the distribution of holes and other factors under loading conditions has become a problem that needs to be considered in structural design. The cohesive zone model(CZM) can effectively avoid the singularity problem of crack tip stress when simulating crack growth, and at the same time can clearly show the crack growth path. Based on exponential cohesive zone model, the finite element analysis of tensile test for metallic materials with hole defects was carried out. The crack propagation law under constant load was obtained. It was proved that CZM could simulate the crack propagation in metallic materials with holes more accurately. The influence of the pore size, shape, distribution on the crack propagation is discussed. The results show that the smaller the distance difference between holes, the greater the supporting reaction force. The smaller the radius of the hole, the higher the fracture toughness and the maximum supporting reaction force of the metal plate. And it also can be seen that as the number of holes increases, the maximum supporting reaction force and fracture toughness of the metal plate decrease. The use of staggered holes distribution has greater supporting force and better toughness. The research results of this paper provide a theoretical basis and reference for investigating the propagation and propagation of cracks in the process of damage and failure of materials and for structural design and performance evaluation of engineering materials.

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Section: Materials Parametersmentioning

confidence: 99%

Simulation of crack growth for metal plates with holes based on cohesive zone model

Ma¹,

Song²,

Zhang³

et al. 2022

Mater. Res. Express

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show abstract

“…e introduction of residual compressive stress can postpone occurrence of fatigue cracking, but residual compressive stress was released once cracking happens and the propagation rate of cracks approximate to the untreated welded joints. Attaching steel or fiber-reinforced polymer (FRP) materials by bolting or bonding on the surface of existing steel structures can reduce stress intensity by improving local stiffness of welded joints [10][11][12][13][14][15][16][17][18][19], which have been regarded as cold reinforcement as a result of no welding. Compared with steel material, the FRP materials are more completive for some advantages of low weight, convenience in fixing and elimination of corrosion problem.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of CFRP‐Strengthened Rib‐to‐Diaphragm Welded Details of Orthotropic Steel Decks: Experimental and Numerical Evaluation

Song

Jiang

Wang

et al. 2022

Advances in Civil Engineering

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Rib-to-diaphragm welded details of orthotropic steel decks (OSDs) are susceptible to fatigue cracking. To deal with such cracking problem, a strengthening method using externally bonded carbon fiber-reinforced polymer (CFRP) plates was investigated by fatigue experiment and numerical evaluation. A full-scale OSD specimen with two ribs and two diaphragms was tested to evaluate fatigue cracking behavior, as well as the stress before and after strengthening. An experimentally validated numerical model was established to confirm the optimal opportunity for CFRP strengthening. The influence of different CFRP strengthening measures were then discussed on the stress intensity factors at crack tips. It was shown that bonding of CFRP plates can significantly reduce stress of rib-to-diaphragm welded details. The best opportunity for CFRP strengthening is selected as the length of crack reaches at 25.00 mm where the amplitude of stress intensity factor is the smallest. The attachment of CFRP plates by bonding on the surface of cracked plates can reduce stress response at cracked region by more than 30%. The length of crack is of no flat growth until the total number of loading cycle after strengthening arrived at 0.8 million. Results of SIFs calculated by numerical model dropes after strengthening with reduction rate more than 35% and 18% at two crack tips and crack midpoint, respectively. Compared to the geometric dimensions of CFRP, the elastic modulus of CFRP and glue layer shows more significant influence on the fatigue performance of Rib-to-diaphragm welded details due to their stronger restraint to the propagation of crack peaks. This study provided a technical reference to the design and actual application of CFRP in the strengthening of welded details in OSDs.

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“…In addition to the above researches, some studies have investigated the effectiveness of pre-stressed CFRP plates in increasing the fatigue lifetime [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Adding pre-stressing force in the CFRP material allows using a more significant portion of the strength of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Adding pre-stressing force in the CFRP material allows using a more significant portion of the strength of the material. Moreover, by applying an adequate level of pre-stress to the CFRP laminate, the effective SIF at crack tip can be reduced below the SIF threshold and therefore lead to a full stop of the crack propagation [ 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…For a high number of rivets (more than four rivets in a line), Yin et al [ 21 ] showed that the fatigue resistance of a riveted joint (with and without pre-tension of the rivets) is similar to that of a plate with a center hole. To date, researchers have conducted various investigations (both experimental and numerical) on the use of FRP to repair symmetrical through-thickness cracks [ 2 , 3 , 4 , 6 , 8 , 9 , 12 , 13 , 15 , 22 , 23 ]. However, in riveted assembly, only one fatigue crack typically originates from the center hole (un-symmetrical through-thickness crack).…”

Section: Introductionmentioning

confidence: 99%

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Stress Intensity Factor Assessment for the Reinforcement of Cracked Steel Plates Using Prestressed or Non-Prestressed Adhesively Bonded CFRP

et al. 2021

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The use of adhesively bonded carbon fiber reinforced polymer (CFRP) materials to reinforce cracked steel elements has gained widespread acceptance in order to extend the lifespan of metallic structures. This allows an important reduction of the stress intensity factor (SIF) at the crack tip and thus a significant increase of the fatigue life. This paper deals with the assessment of the SIF for repaired cracked steel plates, using semi-empirical analysis and finite element analysis. Metallic plates with only one crack originating from a center hole were investigated. Virtual crack closure technique (VCCT) was used to define and evaluate the stress intensity factor at crack tip. The obtained modeling results are compared with experimental investigations led by the authors for different reinforcement configurations including symmetrical and non-symmetrical reinforcement, normal modulus and ultra-high-modulus CFRP plates, and pre-stressed CFRP plates. Results show that finite element model (FEM) analysis can obviously simulate the fatigue performance of the CFRP bonded steel plates with different reinforcement configurations. Moreover, a parametric analysis of the influence of the pre-stressing level was also conducted. The results show that an increase of the pre-stressing level results in an increase of the fatigue life of the element.

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Irreversible cyclic cohesive zone model for prediction of mode I fatigue crack growth in CFRP-strengthened steel plates

Cited by 24 publications

References 34 publications

Simulation of crack growth for metal plates with holes based on cohesive zone model

Simulation of crack growth for metal plates with holes based on cohesive zone model

Fatigue Performance of CFRP‐Strengthened Rib‐to‐Diaphragm Welded Details of Orthotropic Steel Decks: Experimental and Numerical Evaluation

Stress Intensity Factor Assessment for the Reinforcement of Cracked Steel Plates Using Prestressed or Non-Prestressed Adhesively Bonded CFRP

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