Effect of R ratio and ΔK level on the hysteretic energy dissipated during fatigue crack propagation

Ranganathan, N.; Jendoubi, K.; Benguediab, M.; Petit, Johann

doi:10.1016/0036-9748(87)90247-x

Cited by 19 publications

(10 citation statements)

References 5 publications

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“…A critical plastic dissipation criterion for fatigue crack extension in ductile solids was first suggested by Rice [2,74]. Dissipated energy approaches to fatigue crack growth prediction have since been the subject of numerous analytical ( [75][76][77] and experimental [78,79] investigations. The current approach considers the total plastic dissipation per cycle occurring in the reversed plastic zone ahead of the crack.…”

Section: Identification Of Crack Tip Parametersmentioning

confidence: 99%

Effect of crack closure on non-linear crack tip parameters

Antunes

Sousa

Branco

et al. 2015

International Journal of Fatigue

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Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, some authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and without contact were developed for a wide range of loading scenarios and the crack tip parameters usually linked to fatigue crack growth, namely range of cyclic plastic strain, crack tip opening displacement, size of reversed plastic zone and total plastic dissipation per cycle were investigated. It was demonstrated that: (i) LEFM concepts are applicable to the problem under study; (ii) the crack closure phenomenon has a great influence on crack tip parameters decreasing their values; (iii) the ΔKeff concept is able to explain the variations of crack tip parameters produced by the contact of crack flanks; and (iv) the analysis of remote compliance is the best numerical parameter to quantify the crack opening level. Therefore the crack closure concept seems to be valid. Additionally, the curves of crack tip parameters against stress intensity factor range obtained without contact may be seen as master curves.

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Section: Identification Of Crack Tip Parametersmentioning

confidence: 99%

Effect of crack closure on non-linear crack tip parameters

Antunes

Sousa

Branco

et al. 2015

International Journal of Fatigue

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“…Once evaluated KI,max and Jmax from purely elastic and elastic-plastic analyses, respectively, J max,p was calculated from Eqn. (5).…”

Section: Experimental Evaluation Of the J-integral Based On Thermal mentioning

confidence: 99%

“…he development of infrared cameras having increased performances in terms of thermal sensitivity, spatial resolution and frame rate has given impulse to several experimental investigations involving the evaluation of temperature in Facture Mechanics problems. Some fields where infrared cameras have allowed an enhanced insight include: the investigation of local heating at the crack tip [1][2][3], the assessment of crack propagation based on the hysteresis energy [4][5][6][7][8][9][10][11][12][13][14][15], the influence of thermal effects on stress intensity factors [16,17], the evaluation of the plastic zone size and its correlation to the heat energy dissipation at the crack tip [18][19][20][21][22][23][24][25][26] and the correlation of energy dissipation at the crack tip with the J-integral [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

On relation between J-integral and heat energy dissipation at the crack tip in stainless steel specimens

Meneghetti

Ricotta²,

Pitarresi³

2019

Frattura Ed Integrità Strutturale

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In this paper, an experimental procedure to evaluate the elasticplastic J-integral at the tip of a fatigue crack is presented. According to this new approach, the elastic component of the J-integral is derived from Thermoelastic Stress Analysis, while the plastic component of the J-integral is derived from the heat energy loss. An analytical link is proposed to apply this new experimental technique. Therefore, the elastic-plastic J-integral range was evaluated starting from infrared temperature maps measured in situ during crack propagation tests of AISI 304L stainless steel specimens. It was found that the range of the infrared thermography-based J-integral correlated well the crack growth data generated in small as well as large scale yielding conditions. Finally, the experimental values of the J-integral were successfully compared with the corresponding numerical values obtained from elasticplastic finite element analyses.

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“…The measure of the energy is based on measurement of the local deformation, known as local method and based on microhardness measurements as close as possible at the tip of the crack, in the plastic zone (Grossetete and mémoire 1988;Ranganathan 1987). The Vickers microhardness measurements were made by applying a load F = 1 kgf with a holding time of 10 s, the indenter tip is a standard diamond pyramid square base and an apex angle between faces equal to 136 • .…”

Section: Principle Of Local Energy Measurementmentioning

confidence: 99%

Estimation of the energy of crack propagation in different zones of a welded joint by the local technique

et al. 2015

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The fatigue damage of a material generally goes through of an incident or a heterogeneity producing a local stress concentration. The growth of crack is related to the existence of a plastic zone at the crack tip and accompanied by an energy dissipation. The objective of this study is to analyze the evolution of the energy at the crack tip during the propagation of a crack in a welded joint. In order to determine the energy nearest the end of the crack in the plastic zone, we used microhardness measurements. The estimate of the total strain in each measurement point was determined by a polynomial relation between Hv and ε t /2. After the determination of the average strain, the total energy in each zone was deducted. The higher value of this energy is in the Weld Metal, it is more lower in the Base Metal and even lower in the Heat Affected Zone.

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Effect of R ratio and ΔK level on the hysteretic energy dissipated during fatigue crack propagation

Cited by 19 publications

References 5 publications

Effect of crack closure on non-linear crack tip parameters

Effect of crack closure on non-linear crack tip parameters

On relation between J-integral and heat energy dissipation at the crack tip in stainless steel specimens

Estimation of the energy of crack propagation in different zones of a welded joint by the local technique

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