Fatigue crack propagation prediction of a pressure vessel mild steel based on a strain energy density model

Huffman, Peter; Ferreira, A.J.M.; Correia, José A.F.O.; Jesus, Abílio M.P. De; Lesiuk, Grzegorz; Berto, Filippo; Fernández‐Canteli, Alfonso; Glinka, G.

doi:10.3221/igf-esis.42.09

Cited by 26 publications

(16 citation statements)

References 21 publications

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“…But the local strainbased approach is preferred if the elementary material is subjected to nominally cyclic elastic stresses and strains with stress concentration that may lead to local cyclic plasticity, thus it is used in fatigue life prediction of crack initiation on notched component of materials [47,76]. The local strain-based approach considers stresses and strains at the crack tip and associated stress intensity factor to compute total fatigue life of both crack initiation and propagation [77,78]. Several models have been proposed to replace the fatigue life prediction in the last 4 decades.…”

Section: Fatigue Growth Based On Local Strain Approachmentioning

confidence: 99%

Consolidated derivation of fracture mechanics parameters and fatigue theoretical evolution models: basic review

Ameh

2020

SN Appl. Sci.

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Presence of cracks lead to structural steels failure below critical yield strength. The primary aim of the present article is to simplify and consolidate mathematical derivation of stress concentration, fracture stress, stress intensity factor, crack tip opening displacement and J-integral parameters from the first principle as well as application to fatigue. The review explains the mathematical derivation of fracture mechanics parameters from the theoretical concept, including alternatives to fatigue life prediction with strain-based approach method. The stress concentration around a notch can only be performed if the radius of the notch is far greater than zero and the stress field at sharp crack shows singularity when the crack tip radius is equal to zero. Furthermore, blunted crack tip violates stress singularity, while the crack tip opening displacement and J-integral parameters show the solution of a crack extending beyond zero crack tip radius, thus are used to characterize material stress fields with blunted crack tip. The review highlights benefit of characterizing fatigue crack growth with J-integral and crack tip opening displacement parameters over stress intensity factor. This paper would benefit majorly engineers and specialists in nuclear, aviation, oil and gas industries. Keyword Crack tip opening displacement • Fatigue • J-integral • Plastic zone • Stress intensity factor Abbreviations Δk Applied stress intensity factor Γ Close path dv Change in load displacement n Constant for deeply notched specimen , Complex analytical function z Conjugate function a Crack length Δa Change in crack length k op Crack opening stress factor ΔCTOD Crack tip opening displacement k c Critical fracture toughness of material c

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Section: Fatigue Growth Based On Local Strain Approachmentioning

confidence: 99%

Consolidated derivation of fracture mechanics parameters and fatigue theoretical evolution models: basic review

Ameh

2020

SN Appl. Sci.

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“…Of course, the mentioned assumptions are reflected in several models based on low cycle fatigue (LCF) data. [20][21][22][23][24][25][26] From the energy point of view, this assumption is described well by the critical surface energy parameter G.…”

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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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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“…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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Fatigue crack propagation prediction of a pressure vessel mild steel based on a strain energy density model

Cited by 26 publications

References 21 publications

Consolidated derivation of fracture mechanics parameters and fatigue theoretical evolution models: basic review

Consolidated derivation of fracture mechanics parameters and fatigue theoretical evolution models: basic review

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

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