Experimental and numerical investigation of thickness effects in plasticity-induced fatigue crack closure

Matos, P.F.P. de; Nowell, D.

doi:10.1016/j.ijfatigue.2008.12.003

Cited by 80 publications

(57 citation statements)

References 9 publications

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“…Tables 1 Identified coefficients The displacement field u is for each technique obtained by multiplying the reference fields (6) and (7) (b) Measured ∆K as a function of the crack length increment ∆a for both methods compared to tabulated values for CCT samples [34], and interpolated curves obeying Equation (13). Estimation of the plastic zone radius.…”

Section: Discussionmentioning

confidence: 99%

“…where ω i are amplitudes of order i of the mode I fields (6). These different estimates are plotted all along the propagation in Figure 12(b).…”

Section: Plastic Zone Sizementioning

confidence: 99%

“…These conditions could also be studied thanks to the analysis of SIF histories [5]. Crack propagation laws were also determined when the crack tip position was optically determined when using a long-distance microscope [7], or by using the crack opening displacements [8]. In the following, another will be followed to determine the crack tip position.…”

Section: Introductionmentioning

confidence: 99%

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Identification of a crack propagation law by digital image correlation

Mathieu

Hild

Roux

2012

International Journal of Fatigue

120

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It is proposed to use digital image correlation (DIC) to identify parameters governing crack propagation of commercially pure titanium. To achieve this goal, crack tip location, stress intensity factor, T -stress and plastic zone size are sought. Most of the DIC approaches are based upon local analyses of displacements, and their subsequent projection onto a set of mechanically relevant fields. It is proposed to perform these two sequential steps in a unique (and integrated) way, and to compare the results with a global approach to DIC with subsequent post-processing. A priori performances of two global approaches are compared, and a propagation law is identified form the series of raw images of a fatigue test on commercially pure titanium with the integrated approach that yields better results.

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Section: Discussionmentioning

confidence: 99%

“…where ω i are amplitudes of order i of the mode I fields (6). These different estimates are plotted all along the propagation in Figure 12(b).…”

Section: Plastic Zone Sizementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of a crack propagation law by digital image correlation

Mathieu

Hild

Roux

2012

International Journal of Fatigue

120

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“…For thin components, the surface behaviour is normally representative of the T complete behaviour [7]. However, for many engineering components, the surface may not be at all representative of the majority of the bulk of the material [8,9] and not describe accurately the complete component behaviour [10,11]. Intense hard X-ray beams at synchrotron facilities now give us the possibility of probing the bulk of engineering materials both in terms of the geometry and in terms of elastic strain.…”

Section: Introductionmentioning

confidence: 99%

Mid-thickness studies of the stress intensity factor in the bulk of bainitic steel

López-Crespo

Vazquez-Peralta

Simpson³

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. The current work aims at estimating the stress intensity factor deep inside the bulk from elastic strain data measured by synchrotron X-ray diffraction. Key features affecting the evaluation of the stress intensity factor are the number of terms in the analytical model describing the crack tip field, the extension and position of the area of interest of the experimental data, the effect of the experimental data collected within the plastic zone and the number of elastic strain data points used. Here a parametric study of these features is presented in terms of their influence for the stress intensity factor determination. It was found that 3 or 4 terms in Williams' expansion is often sufficient; the data should be collected from across the full range of angles around the crack tip; and the number of points/number of terms should be greater than 40.

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“…As análises numéricas permitem estimar a carga de abertura de trinca analisando a evolução do campo de tensões, deformações e deslocamentos na região próxima à trinca, que está influenciada pelo contato das faces da trinca. Figura 9: Efeitos de espessura modelados por meio de fechamento de trinca [18]. 19 Figura 10: Uso do fechamento de trinca para modelar os efeitos de sobrecargas [19] .…”

Section: Introductionunclassified

Avaliação da vida à fadiga em materiais homogêneos e juntas soldadas incluindo efeitos de fechamento de trinca.

Burgos¹,

Felipe²

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Experimental and numerical investigation of thickness effects in plasticity-induced fatigue crack closure

Cited by 80 publications

References 9 publications

Identification of a crack propagation law by digital image correlation

Identification of a crack propagation law by digital image correlation

Mid-thickness studies of the stress intensity factor in the bulk of bainitic steel

Avaliação da vida à fadiga em materiais homogêneos e juntas soldadas incluindo efeitos de fechamento de trinca.

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