Improvement of the fatigue crack growth resistance in long term operated steel strengthened with CFRP patches

Lesiuk, Grzegorz; Katkowski, M.; Duda, Monika; Królicka, Aleksandra; Correia, José A.F.O.; Jesus, Abílio M.P. De; Rabiega, J.

doi:10.1016/j.prostr.2017.07.109

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…It can generally support the global brittleness of metallic members of the girder. Therefore, this type of material is representative for the efficiency of the strengthening strategy in terms of fatigue crack propagation in similar long-term operated structures (Lesiuk et al , 2017).…”

Section: Methodsmentioning

confidence: 99%

Fatigue crack growth rate in CFRP reinforced constructional old steel

Lesiuk

Katkowski

Correia

et al. 2018

IJSI

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Purpose The purpose of this paper is twofold: first, to observe an influence of different Composite Fibre-Reinforced Polymer (CFRP) patches, whose application to metals is very easy, in suppling and significantly elongating the service time; and second, the numerical calculation of the reduced stress intensity factor (SIF) range for strengthened cracked steel specimens. Design/methodology/approach One of the successful strengthening methods is the CFRP patching along the fatigue crack paths. The presented approach has been studied and discussed in this paper on the background of the numerical and experimental data. As it was expected, the proposed strengthening method is efficient and promising in case of the “immediate” repairs of critical members with cracks. The manufacturing process of specimens and test methodology as well as numerical approach to calculate SIFs for various reinforcements of steel specimens are presented. For this purpose, the Extended Finite Element Method was involved and described. Findings The main mechanism of fatigue crack growth retardation is associated with local ΔK reduction due to CFRP patches; any type of reinforcement results in an increase in af and a significant decrease in SIF values. The beach-marking method is described as a good, reliable and comprehensive method to capture the crack propagation in structures consisting of various materials and could be applied successfully for mixed mode testing. Originality/value A detailed experimental-numerical approach for fatigue crack growth in long-term operated structures made of steel is presented. The strengthening methodology is presented with consideration of the various CFRP patches configurations.

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Section: Methodsmentioning

confidence: 99%

Fatigue crack growth rate in CFRP reinforced constructional old steel

Lesiuk

Katkowski

Correia

et al. 2018

IJSI

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“…A ferrite grain structure with non-metallic inclusions is observed, corresponding well with carbon content. Static tensile testing was also performed and reported in [18]. A representative true stress-strain curve is shown in Figure 2, from which is reported the following mechanical properties [18]: Young modulus, E = 212 GPa; ultimate tensile strength, σ u = 416 MPa; yield tensile strength, Re = 304 MPa.…”

Section: Materials Datamentioning

confidence: 99%

“…Table 1. Chemical composition of the investigated steel and typical values for puddle iron and old mild steel [18]. hand, realistic assessment of the structural integrity using modern tools such as the finite element method [10][11][12] requires the substitution of growth models for uniaxial states with models for mixed fracture growth modes.…”

Section: Materials Datamentioning

confidence: 99%

“…This paper is intended to contribute to fill the existing gap in literature analyzing the fatigue crack growth process for typical fatigue crack load schemes, i.e., tension and shear (I + II), occurring at the riveted crack initiation points [16], and bending and torsion (I + III), occurring at the bridge structural members [17]. Due to the lack of available experimental data for objects erected at the beginning of the 20th century, it was decided to focus the research on material samples from a structural part extracted from a repaired existing steel bridge (1899-1902) located in Poland [18].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Fatigue Crack Growth in Long-Term Operated Mild Steel under Mixed-Mode (I + II, I + III) Loading Conditions

et al. 2020

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The paper presents an analysis of mixed-mode fatigue crack growth in bridge steel after 100-years operating time. Experiments were carried out under mode I + II configuration on Compact Tension Shear (CTS) specimens and mode I + III on rectangular specimens with lateral stress concentrator under bending and torsion loading type. Due to the lack of accurate Stress Intensity Factor (SIF) solutions, the crack path was modelled with the finite element method according to its experimental observation. As a result, the Kinetic Fatigue Fracture Diagrams (KFFD) were constructed. Due to the change in the tendency of higher fatigue crack growth rates from KI towards KIII dominance for the samples subjected to bending and torsion, it was decided to analyze this phenomenon in detail using electron-scanning microscopy. The fractographic analysis was carried out for specimens subjected to I + III crack loading mode. The mechanism of crack growth in old bridge steel at complex loads was determined and analyzed.

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“…The aim of the study was to determine the adhesion force of the polymeric coatings to the steel base, to compare the impact resistance of multilayer coatings based on the damage analysis caused by the impact of the energy of 17 J, to determine the coating resistance to cracking and peeling from the base as well as to investigate the influence of the coating on static mechanical properties and the fatigue lifetime of the sample, which is expected to improve. In general, the most widely used strategy of fatigue lifetime improvement is strengthening metallic structures using CFRP (carbon fiber reinforced polymer) patches [21,22,23]. The main reason for this is the redistribution of forces in metallic and composite structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Polyurea Composite Coating on Selected Mechanical Properties of AISI 304 Steel

2019

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This paper contains experimental results of mechanical testing of the AISI 304 steel with composite coatings. The main goal was to investigate the impact of the applied polyurea composite coating on selected mechanical properties: Adhesion, impact resistance, static behavior, and, finally, fatigue lifetime of notched specimens. In the paper the following configurations of coatings were tested: EP (epoxy resin), EP_GF (epoxy resin + glass fabric), EP_GF_HF (epoxy resin + glass fabric hemp fiber), EP_PUA (epoxy resin + polyurea) resin, EP_GF_PUA (epoxy resin + glass fabric + polyurea) resin, and EP_GF_HF_PUA (epoxy resin + glass fabric + hemp fiber + polyurea) resin. The highest value of force required to break adhesive bonds was observed for the EP_PUA coating, the smallest for the single EP coating. A tendency of polyurea to increase the adhesion of the coating to the base was noticed. The largest area of delamination during the impact test was observed for the EP_GF_HF coating and the smallest for the EP-coated sample. In all tested samples, observed delamination damage during the pull-off test was located between the coating and the metallic base of the sample.

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Improvement of the fatigue crack growth resistance in long term operated steel strengthened with CFRP patches

Cited by 9 publications

References 7 publications

Fatigue crack growth rate in CFRP reinforced constructional old steel

Fatigue crack growth rate in CFRP reinforced constructional old steel

Study of the Fatigue Crack Growth in Long-Term Operated Mild Steel under Mixed-Mode (I + II, I + III) Loading Conditions

Influence of Polyurea Composite Coating on Selected Mechanical Properties of AISI 304 Steel

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