Strain localization and damage development during bending of Al–Mg alloy sheets

Davidkov, Aleksandar; Jain, M.; Petrov, Roumen; Wilkinson, D. S.; Mishra, R. K.

doi:10.1016/j.msea.2012.04.093

Cited by 50 publications

(15 citation statements)

References 18 publications

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“…It is to be noted that microstructure also plays a major role in determining the limit strain in small radius bending (or hemming). For example, precipitates at grain boundaries and precipitate alignment along rolling and transverse directions affect the limit strains in bending, as noted in . Consequently, the interest in the present work was in general bending characteristics and assessment of continuum models of bending and not in the limit strain values.…”

Section: Discussionmentioning

confidence: 99%

“…The primary difficulty with the use of DIC technology with respect to through‐thickness strain measurement in thin‐sheet bending lies in applying a suitable speckle pattern in the through‐thickness region and achieving sufficient image magnification and resolution in the speckled region that remains in focus during the course of bending. These problems have been alleviated to a great extent by conducting in situ bending experiments in a scanning electron microscope in conjunction with post‐test DIC analysis of the continuously recorded images [, ]. However, its use in large‐scale laboratory bending experiments has not been demonstrated.…”

Section: Literature Reviewmentioning

confidence: 99%

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Assessment of Analytical Models of Pure Bending of Sheet Materials Using the Digital Image Correlation Method

Govindasamy

Jain

2016

Strain

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Bending of sheet materials is a common forming mode for shaping sheet components. Although many numerical models of bending, both analytical and numerical simulations based, are available in the literature, extensive experimental validations have been rather limited. A new bend test method and complementary three-dimensional finite element (FE) simulation of the experiments are employed to assess the predictions from an advanced analytical and FE model of pure bending of aluminium sheet materials. The experimental set-up developed and utilised is an open concept design that allows access to the tensile surface and through-thickness region in the vicinity of the specimen bend line to continuously record images of the deforming specimen with two cameras. The specimen images are analysed for strains using an online strain mapping system based on digital image correction method. Tangential strain distribution results from the models in terms of material thinning in the bend region are compared with those from the experiments on AA2024 aluminium sheet material by considering the responses from the specimen edges and mid-width regions at the bend line. Furthermore, the tangential and radial stress distributions on the through-thickness section of the specimen from the analytical model are compared with those from the FE model. The results from experiments, FE model and analytical model are compared and discussed in the light of the experimental data and the assumptions involved in the development of the models.

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Section: Discussionmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Assessment of Analytical Models of Pure Bending of Sheet Materials Using the Digital Image Correlation Method

Govindasamy

Jain

2016

Strain

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“…For the reconstruction of individual grains, misorientations larger than 101 were identified as grain boundaries. Another method of quantifying strain localization is by digital image correlation as used by Davidkov et al [27] on continuous cast AA5754 sheet samples. This method was not applied here because of the large out-of-plane movements.…”

Section: Strain Mapsmentioning

confidence: 99%

Strain localization and damage mechanisms during bending of AA6016 sheet

Mattei

Daniel

Guiglionda

et al. 2013

Materials Science and Engineering: A

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“…Thus accurate local measurements of strain localisation are important in studies of dynamic tensile failure. In recent years, the digital image correlation (DIC) technique has been successfully used for full-field strain mapping applications in many research laboratories [3][4][5][6]. Theoretically, DIC can achieve good reliability and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Deformation Field during High Strain Rate Tensile Tests of RAFM Steel Using DIC Technique

Krishnan

Baranwal

Moitra

et al. 2014

Procedia Engineering

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Towards developing a constitutive model for describing the flow and fracture behaviour of engineering materials under higher strain rates, studying the deformation fields in uniform and localized deformation regime using the high strain rate tensile tests is of technical importance. To this end, high strain rate tensile tests have been carried out on flat tensile specimen of reduced activation ferritic-martensitic (RAFM) steel at different loading rates varying from 5 m/s to 14 m/s. The strain fields at uniform and localized deformation regime have been mapped by Digital Image Correlation (DIC) technique. For carrying out the DIC, high speed images of the specimen surface have been captured in-situ by high speed camera, synchronized with the loaddisplacement data acquisition system. The stress-strain fields thus obtained in this study would be an appropriate input to numerical analysis to characterize the flow and fracture behaviour of RAFM steels.

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Strain localization and damage development during bending of Al–Mg alloy sheets

Cited by 50 publications

References 18 publications

Assessment of Analytical Models of Pure Bending of Sheet Materials Using the Digital Image Correlation Method

Assessment of Analytical Models of Pure Bending of Sheet Materials Using the Digital Image Correlation Method

Strain localization and damage mechanisms during bending of AA6016 sheet

Assessment of Deformation Field during High Strain Rate Tensile Tests of RAFM Steel Using DIC Technique

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