DIC-aided biaxial fatigue tests of a 304L steel

Poncelet, Martin; Barbier, G.; Raka, Bumedijen; Courtin, S.; Desmorat, Rodrigue; Leroux, Jean‐Christophe; Vincent, L.

doi:10.1051/epjconf/20100616002

Cited by 5 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is very difficult to find experimental results (for biaxial tensile loads) with a load ratio of R = −1, especially for this material. However Poncelet et al [39] have also shown that stress biaxiality is not detrimental compared to a uniaxial loading conditions. Their conclusion was based on a small number of equibiaxial tensile fatigue tests done on an austenitic stainless steel.…”

Section: Biaxial Tensile Loads (R = −1)mentioning

confidence: 96%

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. shown that two different coexisting fatigue damage mechanisms occur in this materials, depending on the presence of different microstructural heterogeneities (i.e. micro-shrinkage pores, Si particles, Ferich intermetallic phases, DAS of the Al-matrix, etc.). In order to take into account both of these damage mechanisms, a probabilistic approach using the weakest link concept is introduced to model the competition between the two mechanisms. This approach leads naturally to a probabilistic Kitagawa type diagram, which explains the relationship between the fatigue behaviour of the material and the different casting processes or post-treatments (e.g. gravity casting and HIP).It is shown that the sensitivity to the different loading modes (i.e. uniaxial with and without mean stress, torsion and equibiaxial tension) depends on the microstructural heterogeneities responsible for crack initiation. For a porosity-free alloy, the predictions are very good for combined tension-torsion loading modes. When pores are present and control the fatigue strength, the predictions are very satisfactory for the uniaxial loads with different R-ratios and slightly conservative for multiaxial loads (i.e. torsion and equibiaxial tension). Never-the-less, they are much better than the predictions of theHighlights ► High cycle fatigue modelling of AlSi7Cu05Mg03 for complex loading conditions. ► Modelling of two coexisting fatigue damage mechanisms. ► A probabilistic approach is proposed to model the competition between these mechanisms. ► The approach leads naturally to a probabilistic Kitagawa type diagram.

show abstract

Section: Biaxial Tensile Loads (R = −1)mentioning

confidence: 96%

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

View full text Add to dashboard Cite

show abstract

“…DIC, which can determine the displacements of an object under load in 2D with great accuracy and quantified uncertainty [50,51], has proven to be a flexible and useful tool for deformation analysis. This technique has been used on different materials like steel [52], composites [27,28,53,54], wood [55] or paper [6]- [8], [56,57].…”

Section: Introductionmentioning

confidence: 99%

Statistical properties of low cycle fatigue in paper

Miksic¹,

Koivisto²,

Alava³

2011

J. Stat. Mech.

View full text Add to dashboard Cite

We consider fatigue fracture in the low-cycle limit. We use paper as the tested material and we study the failure and the deformation of individual samples, with a main emphasis on the possible predictability. The experimental procedure is to study fatigue in tension and follow the evolution of mechanical properties of paper samples. The primary quantity is the strain developing during load cycles and its evolution. Two concurrent methods are used to this end: vertical displacement measured by a laser interferometer sensor, and the digital image correlation technique (DIC). By the DIC, we obtain accurately at the same time displacement data and the spatial fields of strain and strain rate. The final rupture is signalled by a sharp final increase of different variables, like deformation, strain rate and their fluctuations. We find interestingly enough that looking at the evolution of these quantities during the first fatigue cycle only is already a good indicator about the lifetime of the sample. Crackling noise is also recorded during loading via acoustic emission (AE). AE is mostly accumulated during a short time interval before breakage. The results are compared with a fibre bundle model of fatigue in heterogeneous materials.

show abstract

“…Magnifying optics have been used in a number of recent studies to observe areas of interest ranging from 31 x 31 mm [1], 7.5 x 7.5 mm [2,3] and 3 x 3 mm [4]. When using magnifying optics to observe small areas of interest, the characteristic shape, size and distribution of the applied speckle pattern changes, compared to larger scales, resulting in significantly different attributes for the correlation algorithm to track.…”

Section: Introductionmentioning

confidence: 99%

Speckle Pattern Characterisation for High Resolution Digital Image Correlation

Crammond

Boyd

Dulieu-Barton

2011

AMM

View full text Add to dashboard Cite

Digital image correlation (DIC) is an optical technique for full field deformation measurement. The spatial resolution and precision of the measurements are limited by the number of pixels within the image. The use of magnifying optics provides greater spatial resolution images, enabling smaller displacements to be observed with greater accuracy. Increasing the magnification of an image significantly changes the appearance of the non-periodic, stochastic speckle pattern which provides the grey scale contrast necessary for the image correlation method. In the paper a methodology is developed to evaluate the properties of different speckle pattern types under a range of resolutions up to 705 pixel / mm. Numerical deformation of the patterns is also undertaken to evaluate how the changes in the pattern properties affect the accuracy of the DIC measurements.

show abstract

DIC-aided biaxial fatigue tests of a 304L steel

Cited by 5 publications

References 7 publications

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

Statistical properties of low cycle fatigue in paper

Speckle Pattern Characterisation for High Resolution Digital Image Correlation

Contact Info

Product

Resources

About