Mixed mode I/II/III fatigue crack growth in S355 steel

Rozumek, Dariusz; Marciniak, Zbigniew; Lesiuk, Grzegorz; Correia, José A.F.O.

doi:10.1016/j.prostr.2017.07.125

Cited by 34 publications

(18 citation statements)

References 11 publications

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“…An initial velocity of 715 m/s and a mass of 7.9 g for the projectile, including Materials 2020, 13, 769 7 of 21 3.6 g for the steel core, were assumed. The projectile geometry was taken from a previous study [42], while some parameters of the core damage from other work [43] were taken into account.…”

Section: Numerical Analysismentioning

confidence: 99%

Assessment of the Impact Resistance of a Composite Material with EN AW-7075 Matrix Reinforced with α-Al2O3 Particles Using a 7.62 × 39 mm Projectile

et al. 2020

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The paper presents the results of studies on the effects of shooting composite materials produced by pressure infiltration with the EN AW-7075 alloy as a matrix and reinforcement in the form of preforms made of α-Al2O3 particles. Composite materials were made with two reinforcement contents (i.e., 30% and 40% vol. of α-Al2O3 particles). The composites produced in the form of 12 mm thick plates were subjected to impact loads from a 7.62 × 39 FMJ M43 projectile fired from a Kalashnikov. The samples of composites with different contents of strengthening particles were subjected to detailed microscopic examination to determine the mechanism of destruction. The effect of a projectile impact on the microstructure of the material within the perforation holes was identified. There were radial cracks found around the puncture holes and brittle fragmentation of the front surfaces of the specimens. The change in the volume of the reinforcement significantly affected the inlet, puncture and outlet diameters. The observations confirmed that brittle cracking dominated the destruction mechanism and the crack propagation front ran mainly in the matrix material and along the boundaries of the α-Al2O3 particles. In turn, numerical tests were conducted to describe the physical phenomena occurring due to the erosion of a projectile hitting a composite casing. They were performed with the use of the ABAQUS program. Based on constitutive models, the material constants developed from the identification of material properties were modelled and the finite element was generated from homogenization in the form of a representative volume element (RVE). The results of microscopic investigations of the destruction mechanism and numerical investigations were combined. The conducted tests and analyses shed light on the application possibilities of aluminium composites reinforced with Al2O3 particles in the construction of add-on-armour protective structures.

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Section: Numerical Analysismentioning

confidence: 99%

Assessment of the Impact Resistance of a Composite Material with EN AW-7075 Matrix Reinforced with α-Al2O3 Particles Using a 7.62 × 39 mm Projectile

et al. 2020

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“…However, it is quite evident that a combination of modes I and II (shear mode), hereafter referred to as the mixed mode I/II loading condition, often acts on structural members that can lead to fatigue crack initiation and propagation up to the failure of fatigue-critical structural members [17,18]. Although some research studies have been conducted on the mixed mode I/II fatigue behavior of bare (unstrengthened) mild steel [19][20][21][22][23][24][25][26], which is relevant for civil structural applications, only a few studies can be found in the literature on the mixed mode I/II fatigue strengthening of steel members, which typically dealt with nonprestressed CFRP patching of steel plates with inclined starter notches [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Mixed mode I/II fatigue crack arrest in steel members using prestressed CFRP reinforcement

Hosseini

Nussbaumer

Motavalli

et al. 2019

International Journal of Fatigue

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In the present study, a strengthening design approach is proposed for the mixed mode I/II fatigue crack arrest in existing structural steel members using prestressed unbonded carbon fiber reinforced polymer (CFRP) composites. Through the analytical formulation of mode I and II stress intensity factor ranges, a design model is proposed to determine the strengthening solution, including the required prestressing level and/or the cross-sectional area of the reinforcement, which would ensure the complete arrest of an existing mixed mode I/II fatigue crack in a steel member. In parallel, sets of stepwise high-cycle fatigue tests were carried out on reference unstrengthened and prestressed CFRP-strengthened precracked steel plates of grade S355J2+N under various mode mixities. The experimental results revealed that the maximum tangential stress (MTS) criterion fairly predicts the state of the mixed mode I/II fatigue cracks (i.e., crack arrest or growth) in unstrengthened specimens, while the proposed design model provides a conservative estimation of the mixed mode I/II fatigue threshold in prestressed CFRP-strengthened specimens. Furthermore, the crack propagation characteristics of grade S355J2+N steel, i.e., Paris' law parameters (C and m) and the crack closure parameter (U), were determined and demonstrated to be independent of the material rolling direction. Based on the analytical and experimental results of the current study, it can be concluded that the proposed model can be used for the safe design of strengthening solutions, which is an increasing need to extend the service life of existing fatigue-damaged steel structures; certain recommendations are provided in this regard for practical strengthening applications.

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“…It is expected that rolling direction corresponds to purposed direction of loading (fatigue cracks initiate and grow perpendicularly to the loading direction), see [9]. Note that previous work on S355 [10,11,12] S355 J2 [13] or S355 J0 [14,15] showed that the fatigue crack propagation rate seems to be independent of the rolling direction and resulting microstructure. Fig.…”

Section: Experimental Data Processing Proceduresmentioning

confidence: 93%

Comparison of fatigue crack propagation behaviour in two steel grades S235, S355 and a steel from old crane way

et al. 2020

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Utilization of various steel grades in civil engineering allows designing bridges, bridge elements or simple structures according to their fracture mechanical properties. The service intervals of structures, which are going to be in use for a long time, cannot be calculated only on the basis of tensile and brittle fracture properties but also on the knowledge of the resistance to the fatigue crack growth. This contribution presents a comparison of the fatigue behaviour of two modern steel grades S235 J2, S355 J2 and a steel extracted from an old crane way. The comparison of these steel grades is done by fatigue crack propagation tests (the results of the experimental tests are described using concept of the stress intensity factor range ΔK). The fatigue properties are discussed and recommendations for the use of the steels are stated.

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Mixed mode I/II/III fatigue crack growth in S355 steel

Cited by 34 publications

References 11 publications

Assessment of the Impact Resistance of a Composite Material with EN AW-7075 Matrix Reinforced with α-Al2O3 Particles Using a 7.62 × 39 mm Projectile

Assessment of the Impact Resistance of a Composite Material with EN AW-7075 Matrix Reinforced with α-Al2O3 Particles Using a 7.62 × 39 mm Projectile

Mixed mode I/II fatigue crack arrest in steel members using prestressed CFRP reinforcement

Comparison of fatigue crack propagation behaviour in two steel grades S235, S355 and a steel from old crane way

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