Investigation of fatigue crack closure using multiscale image correlation experiments

Carroll, Jay; Efstathiou, C.; Lambros, John; Şehitoğlu, Hüseyin; Hauber, B.; Spottswood, S. Michael; Chona, Ravinder

doi:10.1016/j.engfracmech.2009.08.002

Cited by 107 publications

(71 citation statements)

References 27 publications

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“…Moreover, taking several pictures of the defect during a load cycle, is it possible to evaluate the evolution of ∆K eff and to calculate crack opening levels. In this work, the procedure discussed in [7][8][9]11] is adopted. Since no mode II sliding was observed, since the crack propagated in a plane perpendicular to the loading direction, only ∆K I was considered in the calculations.…”

Section: Crack Closure Measurements Based On Full Field Regressionmentioning

confidence: 99%

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Multi-scale crack closure measurements with digital image correlation on Haynes 230

Beretta¹,

Rabbolini²,

Bello³

2015

Frattura Ed Integrità Strutturale

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ABSTRACT. An experimental campaign was developed to study fatigue crack growth in Haynes 230, a Ni-based superalloy. The effects of crack closure were investigated with digital image correlation, by applying two different approaches. Initially, full field regression algorithms were applied to extract the effective stress intensity factor ranges from the singular displacement field measured at crack tips. Local closure measurements were then performed by considering crack flanks relative displacements. Two points virtual extensometers were applied in this phase. Experimental results were then compared to the reference da/dN -∆K eff curve: it was found that the correct estimation of crack opening levels shifts all the experimental points on the reference curve, showing that DIC can be successfully applied to measure crack closure effects.

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Section: Crack Closure Measurements Based On Full Field Regressionmentioning

confidence: 99%

“…[6] were the first to propose to extract stress intensity factors from DIC-measured displacements. The necessity to introduce the second term of William's expansion, the T-stress, was highlighted by Carroll et al in [7]. Recently, DIC was employed to analyse fatigue crack growth at high temperature in Haynes 230 [8].…”

Section: Introductionmentioning

confidence: 99%

Multi-scale crack closure measurements with digital image correlation on Haynes 230

Beretta¹,

Rabbolini²,

Bello³

2015

Frattura Ed Integrità Strutturale

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“…In particular, for cyclic tests, one key aspect is related to the estimation of crack opening and closure levels when studying the propagation conditions. The latter ones could be determined by analyzing crack opening displacements measured by DIC [3,4]. These conditions could also be studied thanks to the analysis of SIF histories [5].…”

Section: Introductionmentioning

confidence: 99%

Identification of a crack propagation law by digital image correlation

Mathieu

Hild

Roux

2012

International Journal of Fatigue

119

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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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“…As an example, Abuzaid and coworkers shown that strain heterogeneities can be measured along specific microstructural features and correlated with the nucleation of cracks [9]. Displacement fields were used to calculate opening and closing levels in the high cycle fatigue (HCF) regime [10] and for calculating important fracture mechanics parameters, e.g. the stress intensity factor, [11].…”

Section: Introductionmentioning

confidence: 99%

LCF and crack growth: recent results obtained by DIC

2018

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Abstract. Nowadays, several components for aerospace and energy applications (i.e., turbine disks, offshore pipelines, and combustor chambers) are designed following a safe-life approach in the low cycle fatigue (LCF) regime. As also in the LCF regime it is worth adopting a damage tolerance design, fatigue life is assessed considering a crack propagating from the first load cycle, starting from an initial defect present in the component's most-stressed region or from a microstructural feature. In this frame, fatigue crack growth is described considering LCF conditions, where the driving force at the crack tip can be described with the ΔJ eff parameter. The paper aims to give an overview of the potential applications and perspectives for the adoption of digital image correlation (DIC) measurements to study LCF nucleation and propagation. A visual technique based on the DIC displacement fields was developed to measure crack opening and closing levels in the presence of large strains. The technique is applied to different materials (steels, AlSi10Mg, nickel-based super-alloys). In addition, further applications of the DIC strain measurements are revised for the study of the nucleation stage and the crack tip process zone.

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Investigation of fatigue crack closure using multiscale image correlation experiments

Cited by 107 publications

References 27 publications

Multi-scale crack closure measurements with digital image correlation on Haynes 230

Multi-scale crack closure measurements with digital image correlation on Haynes 230

Identification of a crack propagation law by digital image correlation

LCF and crack growth: recent results obtained by DIC

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