Energy description of fatigue crack growth process - theoretical and experimental approach

Lesiuk, Grzegorz; Szata, M.; Rozumek, Dariusz; Marciniak, Zbigniew; Correia, José A.F.O.; Jesus, Abílio M.P. De

doi:10.1016/j.prostr.2017.07.128

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…Generally, postulated model of fatigue crack growth is associated with the following suppositions: [17][18][19] The material consists of small particles with a finite dimension r that represents the elementary material block size, material below which cannot be regarded as a continuum (see Figure 3(a)); Ahead of a crack tip exist two plastic zones: static and cyclic (see Figure 3(b)); The tip of fatigue crack can be treated as an equivalent to a notch with radius r; The fatigue crack growth can be treated as a representing successive crack growth increment (after N f cycles) due to crack re-initiations over the distance d*, r.…”

Section: Fatigue Crack Growth Modelling Based On Energy Approachmentioning

confidence: 99%

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Energy response of S355 and 41Cr4 steel during fatigue crack growth process

Lesiuk

Szata

Rozumek

et al. 2018

The Journal of Strain Analysis for Engineering Design

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In this research, a novel approach of the fatigue crack growth rate description has been proposed. Based on theoretical and experimental approach, the mean stress effect expressed by R-ratio is present in classical da/dN-DK diagram. According to energy approach-based on the irrevocably dissipated energy accumulated in material (hysteresis loop) during fatigue process-the mean stress effect can be minimalized. Experimental validation of the proposed model was performed using results of fatigue crack propagation data for S355 and 41Cr4 steels in terms of strain energy density parameter DS or cyclic J-integral range-DJ. In contrast to the force approach based on K max (or DK), the energy parameters DS or DJ represent unambiguously the fatigue crack propagation rate, without influence of mean stress effect-R-ratio. However, in near threshold range of kinetic fatigue fracture diagram, the energy parameter displays a slight dispersion of the experimental data. According to the crack closure theory and its U-Elber parameter, the dispersion of experimental data is decreased. Therefore, the crack closure effects have a high significance in energy model-similar to the 'force approach' based on DK concept.

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Section: Fatigue Crack Growth Modelling Based On Energy Approachmentioning

confidence: 99%

“…Generally, postulated model of fatigue crack growth is associated with the following suppositions: 17–19…”

Section: Fatigue Crack Growth Modelling Based On Energy Approachmentioning

confidence: 99%

Energy response of S355 and 41Cr4 steel during fatigue crack growth process

Lesiuk

Szata

Rozumek

et al. 2018

The Journal of Strain Analysis for Engineering Design

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“…Liakat and Khonsari [14] provided that an analytical model and an experimental procedure are presented for estimating the rate and accumulation of thermodynamic entropy and fatigue toughness in metals subjected to cyclic uniaxial tension-compression tests. In addition, Huffman and Correia and others have made remarkable achievements in the study of fatigue crack growth, discussed the effect of different stress ratios on crack growth and explained the crack growth mechanism from the perspective of energy method [15][16][17][18]. Yang et al [19] introduced that theoretical models combining fracture mechanics and thermodynamics have been formulated to quantify the temperature-evolution processes during fatigue.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction model of metallic materials considering crack propagation and closure effect

Liu

Liang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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To consider the effect of crack closure on the mechanical properties of metals, the fatigue life of metal specimens is predicted based on energy dissipation model. The main feature of the model consists in considering the relationship between the total failure energy and the energy density increment. The total failure energy model considers the fatigue crack size and stress amplitude. It is assumed the energy density increment gradually decreases and tends to be stable. The influence of crack closure effect is considered. According to the law of metal fatigue characteristics, a new mathematical model for predicting fatigue life is established. Keywords Energy increment • Metallic material • Crack closure effect • Fatigue life List of symbols b Fatigue strength exponent c The fatigue ductility exponent Δ Stress range a Maximum tensile stress a c Critical crack size a 0 Initial crack size n Strain hardening exponent n ′ Cyclic strain hardening exponent f Fracture ductility ′ f Cyclic fatigue ductility coefficient Δ p Plastic strain range Δ pZ Plastic strain increment under equivalent stress increment Equivalent strain increment parameter W p Plastic strain energy ′ f Cyclic fatigue strength coefficient W One-cycle plastic strain energy increment K ′ Cyclic stress intensity coefficient W pf Total failure energy b Ultimate tensile strength K theff Effective initial stress intensity factor K I

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“…any kinds of research are devoted at describing the behaviour of crack growth in structural component [1][2][3][4][5][6] and joints [7][8][9][10]. Fatigue crack growth in welded joints is still a very attractive engineering problem, because of the occurrence of various types of crack initiators, such as geometrical and microstructural notches or residual M stresses, as well as the presence of numerous non-metallic inclusions and weld defects.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth in welded S355 specimens subjected to combined loadings

Lewandowski

Rozumek

Marciniak

et al. 2019

Frattura Ed Integrità Strutturale

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The paper presents the results of experimental fatigue tests performed on welded S355 specimens subjected to combined bending and torsion loading. In order to analyse how the fillet joints' shape and the load ratio affect the crack growth, we selected two kinds of fillet shape: concave and convex, and two load ratios, namely R =-1, 0. Rectangular specimens with stress concentrators in the form of the external two-sided blunt notches and fillet welded joint were tested. The test results were compared to experiments conducted on solid specimens without welds.

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Energy description of fatigue crack growth process - theoretical and experimental approach

Cited by 7 publications

References 15 publications

Energy response of S355 and 41Cr4 steel during fatigue crack growth process

Energy response of S355 and 41Cr4 steel during fatigue crack growth process

Fatigue life prediction model of metallic materials considering crack propagation and closure effect

Fatigue crack growth in welded S355 specimens subjected to combined loadings

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