Study of systematic errors in strain fields obtained via DIC using heterogeneous deformation generated by plastic FEA

Lava, Pascal; Cooreman, Steven; Debruyne, Dimitri

doi:10.1016/j.optlaseng.2009.08.013

Cited by 105 publications

(76 citation statements)

References 25 publications

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“…on the macroscopic level (entire samples/components) or on the microscopic level (using the natural pattern in micrographs). The accuracy and precision of DIC in elasto-plasticity has been the subject of intensive research and development in recent years [20][21][22] and has been used in various applications for material characterisation, e.g. inverse methodologies [19,23], internal and external work comparisons [24] and virtual fields methodologies [25].…”

Section: Introductionmentioning

confidence: 99%

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

Olofsson¹,

Svensson²,

Lava³

et al. 2014

Materials & Design (1980-2015)

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Due to design and process-related factors, there are local variations in the microstructure and mechanical behaviour of cast components. This work establishes a Digital Image Correlation (DIC) based method for characterisation and investigation of the effects of such local variations on the behaviour of a high pressure, die cast (HPDC) aluminium alloy. Plastic behaviour is studied using gradient solidified samples and characterisation models for the parameters of the Hollomon equation are developed, based on microstructural refinement. Samples with controlled microstructural variations are produced and the observed DIC strain field is compared with Finite Element Method (FEM) simulation results. The results show that the DIC based method can be applied to characterise local mechanical behaviour with high accuracy. The microstructural variations are observed to cause a redistribution of strain during tensile loading. This redistribution of strain can be predicted in the FEM simulation by incorporating local mechanical behaviour using the developed characterization model. A homogeneous FEM simulation is unable to predict the observed behaviour. The results motivate the application of a previously proposed simulation strategy, which is able to predict and incorporate local variations in mechanical behaviour into FEM simulations already in the design process for cast components.

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Section: Introductionmentioning

confidence: 99%

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

Olofsson¹,

Svensson²,

Lava³

et al. 2014

Materials & Design (1980-2015)

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“…The analysis of the frames taken during the loading was done with specialized software. In this work, the in-house code MatchID (KU Leuven, Campus Ghent) (Lava et al 2009(Lava et al , 2010Wang et al 2011) was used. To reveal the displacements and deformations of an object during an experiment, typically a square subset of (2M þ 1) pixels (px) from the undeformed image is taken and its location in the deformed image is traced.…”

Section: Stereo-vision Digital Image Correlation (3d-dic)mentioning

confidence: 99%

The Use of Advanced Optical Measurement Methods for the Mechanical Analysis of Shear Deficient Prestressed Concrete Members

Wilder

Roeck

2016

Int J Concr Struct Mater

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This paper investigates on the use of advanced optical measurement methods, i.e. 3D coordinate measurement machines (3D CMM) and stereo-vision digital image correlation (3D DIC), for the mechanical analysis of shear deficient prestressed concrete members. Firstly, the experimental program is elaborated. Secondly, the working principle, experimental setup and corresponding accuracy and precision of the considered optical measurement techniques are reported. A novel way to apply synthesised strain sensor patterns for DIC is introduced. Thirdly, the experimental results are reported and an analysis is made of the structural behaviour based on the gathered experimental data. Both techniques yielded useful and complete data in comparison to traditional mechanical measurement techniques and allowed for the assessment of the mechanical behaviour of the reported test specimens. The identified structural behaviour presented in this paper can be used to optimize design procedure for shear-critical structural concrete members.

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“…Although, there is a fast technical evolution of high speed cameras, capturing sufficient, good quality, high resolution pictures during a dynamic experiment still remains a challenge. Furthermore, interpretation of the DIC results is not straightforward, errors can easily be introduced [18,19].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…Synchronisation of the images with the strain gage measurements can be done by using a single trigger signal or by using the camera shutter pulse output. The non-commercial software MatchID is used to calculate the strain field from the images [18,19].…”

Section: High Strain Rate Testsmentioning

confidence: 99%

Determining the stress–strain behaviour at large strains from high strain rate tensile and shear experiments

Peirs

Verleysen

Paepegem

et al. 2011

International Journal of Impact Engineering

119

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Study of systematic errors in strain fields obtained via DIC using heterogeneous deformation generated by plastic FEA

Cited by 105 publications

References 25 publications

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

The Use of Advanced Optical Measurement Methods for the Mechanical Analysis of Shear Deficient Prestressed Concrete Members

Determining the stress–strain behaviour at large strains from high strain rate tensile and shear experiments

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