Anisotropy in fracture and fatigue resistance of pearlitic steels and its effect on the crack path

Leitner, Thomas; Hohenwarter, Anton; Pippan, Reinhard

doi:10.1016/j.ijfatigue.2019.02.048

Cited by 17 publications

(3 citation statements)

References 21 publications

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“…The fatigue crack propagation rate and fracture toughness of severely deformed and aligned pearlitic microstructures obtained by high pressure torsion have been examined in previous studies [18,[20][21][22]. It was found that the fracture toughness and fatigue crack propagation resistance is a strong function of the orientation of cementite.…”

Section: Crack Pathmentioning

confidence: 99%

“…This has previously been done by using equal angular channel pressing (ECAP) and high pressure torsion (HPT) [18,19]. Fatigue crack propagation experiments based on Crack Tip Opening Displacement (CTOD) experiments on such severely deformed pearlitic rail material have shown that fatigue crack propagation and fracture toughness strongly correlates with the ferrite-cementite lamellae orientation, i.e., the material properties are anisotropic [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Crack Propagation on Uniaxial Loading of Biaxially Predeformed Pearlitic Rail Steel

Gren,

Ahlström

2023

Metals

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Rolling contact fatigue loading causes the surface material in the top of the rail to severely deform. The microstructure aligns along the shear direction and the mechanical behavior in terms of plastic flow becomes anisotropic. Cracks are initiated in the severely deformed surface region and propagates along the direction of microstructure flow lines. However, the effect of large shear deformation on fatigue crack growth is not yet well understood. In this study, uniaxial fatigue crack propagation of undeformed and biaxially predeformed pearlitic rail steel R260 has been investigated. The material was predeformed to different deformation states using combined axial compression and shear deformation, corresponding to material found at different depths in the severely deformed surface layer of rails. Fatigue crack propagation rate was dependent on the material state and influenced by both work hardening and microstructural anisotropy. It was found that predeformed material exhibited lower crack growth rates than undeformed material under this loading condition. The influence of predeformation on the crack growth direction was limited.

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Section: Crack Pathmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation on Uniaxial Loading of Biaxially Predeformed Pearlitic Rail Steel

Gren,

Ahlström

2023

Metals

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“…n the study of fracture mechanics problems, the anisotropic media represent the most general material characteristics and the most hazardous ones, making them challenging to the procedures of studying the crack propagation problems. In nature, most materials are anisotropic and in the recent works on industrial fields tends to focus on those type of materials [1][2][3][4][5]. I Several works on the crack propagation in anisotropic material made their reliability, where it is investigated with the linear elastic fracture mechanics [6] and the J-Integral [7] but the phase-field modeling developed for the anisotropic surface energy [8] is getting popular for brittle anisotropic material [9,10] and in crystalline material [11,12].…”

Section: Introductionmentioning

confidence: 99%

Mixed Finite Element Computation of Energy Release Rate in Anisotropic Materials Based on Virtual Crack Closure-Integral Method

Derouiche

Bouziane

Bouzerd

2021

Frattura Ed Integrità Strutturale

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The material with anisotropic properties are becoming widely essential due to the ease to manipulate their mechanical properties in order to obtain a particular quality, insure safety or a specific behavior. Those kind of materials are considered anisotropic because their characteristics and behavior are dependent to every direction of the material’s orientation. In this work, the virtual crack closure-integral technique is implemented to a mixed finite element, in addition with the stiffness derivative procedure, to evaluate the energy release rate of crack extension in anisotropic materials. A simulation of a cracked edge rectangular plat with anisotropic characteristics is taken for example. The results obtained are in good agreement with the analytical results, making the proposed technique a good model for fracture investigation and allow it to study more complicated cases in future works.

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Fatigue Crack Characteristics in Gradient Predeformed Pearlitic Steel under Multiaxial Loading

Gren,

Ahlström,

Ekh

2024

Adv Eng Mater

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Rolling contact fatigue of railway rails not only severely deforms the surface material near the rail head, but also induces an anisotropy in the mechanical behavior due to work hardening and alignment of the microstructure along the shear direction. Cracks typically initiate in this region and propagate along the aligned microstructure. The fatigue behavior of rails is evaluated under uniaxial loading in the undeformed material state. However, this is not representative of the contact loading condition and material performance after years of service. Herein, the nonproportional multiaxial fatigue of as‐received and biaxially predeformed pearlitic rail steel R260 is investigated. Four material states are investigated, corresponding to the microstructure found at different depths from the severely deformed surface material at the rail head. A starting notch is machined by electrical discharge machining to control crack initiation and allow for comparable surface crack propagation measurements. The crack path is found to be strongly influenced by the degree of predeformation while the early surface crack propagation rate is found to be similar for all material states.

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Anisotropy in fracture and fatigue resistance of pearlitic steels and its effect on the crack path

Cited by 17 publications

References 21 publications

Fatigue Crack Propagation on Uniaxial Loading of Biaxially Predeformed Pearlitic Rail Steel

Fatigue Crack Propagation on Uniaxial Loading of Biaxially Predeformed Pearlitic Rail Steel

Mixed Finite Element Computation of Energy Release Rate in Anisotropic Materials Based on Virtual Crack Closure-Integral Method

Fatigue Crack Characteristics in Gradient Predeformed Pearlitic Steel under Multiaxial Loading

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