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Fatigue crack growth modelling for cracked small-scale structural details repaired with CFRP
https://orcid.org/0000-0001-7758-9309
https://orcid.org/0000-0001-5699-4428
Abstract This paper presents an analytical model to predict the mode I fatigue crack growth of steel Central Cracked Tensile (CCT) specimens repaired with Carbon Fiber Reinforced Polymer (CFRP) bonded on the two sides of the plate. A review of the behaviors observed in past experimental tests is provided. The CFRP-steel stiffness ratio, as well as the level of the initial crack length and the location of the CFRP patch, influence the performance of the CFRP crack repair. A total of 69 experimental and 7 numerical results of CFRP repaired specimens were collected from the literature and a database is created. Seventy percent of the data (Experimental only) were used for the development of the model and thirty percent for verification. The fatigue crack propagation of each pair of unrepaired and repaired experimental specimens was calibrated for the development of the model. The effect of the CFRP on the fatigue crack propagation is represented by a SIF reduction factor, . An analytical law based on nonlinear regression analysis is proposed to evaluate which depends on the CFRP-steel ratio, level of damage of the steel plate, and patch location. The model is fairly validated with experimental and numerical results. A parametric study is conducted for further verification, the model shows reasonable trends.
Highlights A procedure for the fatigue crack growth modeling (da/dN vs ΔK eff) is proposed. Experimental fatigue data of CFRP-repaired steel structural details were used. A proposed SIF reduction factor, β, is based on nonlinear regression analysis. Parameter β depends on CFRP-steel stiffness, initial damage level, and patch location ratios. A good agreement between predicted and experimental fatigue life was verified.
Fatigue crack growth modelling for cracked small-scale structural details repaired with CFRP
https://orcid.org/0000-0001-7758-9309
https://orcid.org/0000-0001-5699-4428
Abstract This paper presents an analytical model to predict the mode I fatigue crack growth of steel Central Cracked Tensile (CCT) specimens repaired with Carbon Fiber Reinforced Polymer (CFRP) bonded on the two sides of the plate. A review of the behaviors observed in past experimental tests is provided. The CFRP-steel stiffness ratio, as well as the level of the initial crack length and the location of the CFRP patch, influence the performance of the CFRP crack repair. A total of 69 experimental and 7 numerical results of CFRP repaired specimens were collected from the literature and a database is created. Seventy percent of the data (Experimental only) were used for the development of the model and thirty percent for verification. The fatigue crack propagation of each pair of unrepaired and repaired experimental specimens was calibrated for the development of the model. The effect of the CFRP on the fatigue crack propagation is represented by a SIF reduction factor, . An analytical law based on nonlinear regression analysis is proposed to evaluate which depends on the CFRP-steel ratio, level of damage of the steel plate, and patch location. The model is fairly validated with experimental and numerical results. A parametric study is conducted for further verification, the model shows reasonable trends.
Highlights A procedure for the fatigue crack growth modeling (da/dN vs ΔK eff) is proposed. Experimental fatigue data of CFRP-repaired steel structural details were used. A proposed SIF reduction factor, β, is based on nonlinear regression analysis. Parameter β depends on CFRP-steel stiffness, initial damage level, and patch location ratios. A good agreement between predicted and experimental fatigue life was verified.
Fatigue crack growth modelling for cracked small-scale structural details repaired with CFRP
https://orcid.org/0000-0001-7758-9309
https://orcid.org/0000-0001-5699-4428
Abstract This paper presents an analytical model to predict the mode I fatigue crack growth of steel Central Cracked Tensile (CCT) specimens repaired with Carbon Fiber Reinforced Polymer (CFRP) bonded on the two sides of the plate. A review of the behaviors observed in past experimental tests is provided. The CFRP-steel stiffness ratio, as well as the level of the initial crack length and the location of the CFRP patch, influence the performance of the CFRP crack repair. A total of 69 experimental and 7 numerical results of CFRP repaired specimens were collected from the literature and a database is created. Seventy percent of the data (Experimental only) were used for the development of the model and thirty percent for verification. The fatigue crack propagation of each pair of unrepaired and repaired experimental specimens was calibrated for the development of the model. The effect of the CFRP on the fatigue crack propagation is represented by a SIF reduction factor, . An analytical law based on nonlinear regression analysis is proposed to evaluate which depends on the CFRP-steel ratio, level of damage of the steel plate, and patch location. The model is fairly validated with experimental and numerical results. A parametric study is conducted for further verification, the model shows reasonable trends.
Highlights A procedure for the fatigue crack growth modeling (da/dN vs ΔK eff) is proposed. Experimental fatigue data of CFRP-repaired steel structural details were used. A proposed SIF reduction factor, β, is based on nonlinear regression analysis. Parameter β depends on CFRP-steel stiffness, initial damage level, and patch location ratios. A good agreement between predicted and experimental fatigue life was verified.
Fatigue crack growth modelling for cracked small-scale structural details repaired with CFRP
Mohabeddine, Anis (Autor:in) / Correia, José A.F.O. (Autor:in) / Montenegro, Pedro Aires (Autor:in) / Castro, José Miguel (Autor:in)
Thin-Walled Structures ; 161
30.01.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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