Identification of a crack propagation law by digital image correlation

Mathieu, Florent; Hild, François; Roux, Stéphane

doi:10.1016/j.ijfatigue.2011.08.004

Cited by 116 publications

(90 citation statements)

References 38 publications

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“…As mentioned earlier, the choice of the space U the displacement field belongs to is the key to provide a regularization and to make the problem well-posed. Therefore a well suited choice will help convergence to a satisfactory measurement result and above all it will yield small uncertainty levels [23,196,191,149,150]. Conversely, if not well chosen, it may limit the possible performance of the algorithm and thus the quality and reliability of the obtained measurement.…”

Section: Kinematic Basismentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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3D imaging has become popular for analyzing material microstructures. When time lapse series of 3D pictures are acquired during a single experiment, it is possible to measure displacement fields via digital volume correlation (DVC), thereby leading to 4D results. Such ForewordThe present paper aims at reviewing the major developments in Digital Volume Correlation (DVC) over the past ten years. It follows the first review on DVC that was published in 2008 by its pioneer [11]. In the latter, the interested reader will find all the general principles associated with what is now called local DVC. They will not be recalled hereafter. In such approaches the region of interest is subdivided into small subvolumes that are independently registered. In addition to its wider use with local approaches, DVC has been extended to global approaches in which the displacement field is defined in a dense way over the region of interest. Kinematic bases using finite element discretizations have been selected. To further add mechanical content, elastic regularization has been introduced. Last, integrated approaches use kinematic fields that are constructed from finite element simulations with chosen constitutive equations. The material parameters (and/or boundary conditions) then become the quantities of interest.These various implementations assume different degrees of integration of mechanical knowledge about the analyzed experiment. First and foremost, DVC can be considered as a stand-alone technique, which has seen its field of applications grow over the last ten years. In this case the measured displacement fields and post-processed strain fields are reported. With the introduction of finite element based DVC, the measured displacement field is continuous. It is also a standalone technique. However, given the fact that it shares common kinematic bases with numerical simulations, it can be easily combined with the latter. One route is to require local satisfaction of equilibrium via mechanical regularization. Another route is to fully merge DVC analyses and numerical simulations via integrated approaches. Different examples will illustrate how these various integration steps can be tailored and what are the current challenges associated with various approaches.

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Section: Kinematic Basismentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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“…Instead of first measuring displacement fields and then projecting them onto Williams' series, the two steps are integrated into a single analysis where the 55 sought amplitudes (e.g., SIFs, crack tip positions) are a direct result of the registration method. This approach bypasses the need for post-processing the displacement data, thereby reducing errors in the re-projection process [16]. This is of particular importance in the present case since the displacements are very small [21].…”

Section: Some Of Them Such As Single Edge Notch Bending (Senb) and Cmentioning

confidence: 97%

“…An alternative route consists in utilizing full-field measurements. 40 Digital Image Correlation (DIC) was successfully used to monitor cracks in various materials [12,13,14,15,16]. To determine Stress Intensity Factors (SIFs) and crack tip positions, the measured displacement fields are subsequently post-processed via projections onto known solutions of fractured elastic media [12].…”

Section: Some Of Them Such As Single Edge Notch Bending (Senb) and Cmentioning

confidence: 99%

On the validation of integrated DIC with tapered double cantilever beam tests

Grabois

Neggers²,

Ponson

et al. 2018

Engineering Fracture Mechanics

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“…In order to consider a crack closure and estimate its influence on the crack propagation process, it is necessary to determine the maximum load level when crack edges are closed (P cl load levels via DIC were performed in [7][8][9][10] with different experimental conditions (e.g. single overload cycles, specimens of different thickness etc.)…”

Section: Introductionmentioning

confidence: 99%

Application of digital image correlation for estimation of fatigue crack closure level

Еремин¹,

Sunder²,

Panin³

2016

AIP Conference Proceedings

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Abstract. The paper is devoted to the estimation of fatigue crack closure levels under a slow loading-unloading cycle for a precracked single side notched specimen. The crack closure level was determined by DIC technique, when optical images were registered with the help of a high-magnification optical microscope. The shape of hysteresis loops is analyzed to estimate their changing with the distance from the crack tip. Furthermore, the crack closure levels for each "load-displacement" curve were computed by the mean area method. The variation of the crack closure levels with their distance from the specimen edge is discussed. The technique used could be applied for automatic noncontact crack closure measurements under fatigue testing with either constant or variable amplitude.

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Identification of a crack propagation law by digital image correlation

Cited by 116 publications

References 38 publications

Digital Volume Correlation: Review of Progress and Challenges

Digital Volume Correlation: Review of Progress and Challenges

On the validation of integrated DIC with tapered double cantilever beam tests

Application of digital image correlation for estimation of fatigue crack closure level

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