A computational approach to design new tests for viscoplasticity characterization at high strain-rates

Bouda, Pascal; Langrand, Bertrand; Notta‐Cuvier, Delphine; Markiewicz, Éric; Pierron, Fabrice

doi:10.1007/s00466-019-01742-y

Cited by 22 publications

(24 citation statements)

References 43 publications

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“…The synthetic image generation is obtained thanks to a numerical tool very recently proposed by Bouda et al However, in this paper, instead of a grid, the images' texture is the speckle pattern from the reference image of Experiment 2. The first image corresponds to the initial specimen geometry with only a pre‐notch.…”

Section: Methodsmentioning

confidence: 99%

Crack path tracking from full field measurements: A novel empirical methodology

Feld-Payet

Besnerais

Bonnand

et al. 2020

Strain

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The identification of crack growth models requires the knowledge of the crack path geometry and, in particular, of the crack tip position. The objective of the present paper is to provide a criterion for the detection of the crack tip position regardless of the loading conditions or the material behavior. The novelty of the proposed approach is its ability to provide a good estimation of the crack tip even when large plastic deformations occur. The proposed empirical criterion uses the evolution of the displacement gradient standard deviation along a potential crack path to locate the crack tip. It thus relies on full field measures that are relatively smooth while providing accurate displacement vectors even close to the lips. We successfully apply the proposed criterion in two cases of fatigue crack growth: A straight crack at high temperature and a curved crack at room temperature involving large plastic deformations.

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Section: Methodsmentioning

confidence: 99%

Crack path tracking from full field measurements: A novel empirical methodology

Feld-Payet

Besnerais

Bonnand

et al. 2020

Strain

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“…Indeed, these parameters all influence the resulting identification and it is essential to set them using a rational approach. The development of such a methodology is presented in a companion paper by the authors [16]. The present work focuses on the application of the IBII test and VFM on Ti6Al4V samples to drastically reduce the test campaign needed for viscoplastic model identification on a wide viscoplastic spectra.…”

Section: Several Inverse Methods Have Been Developed For Identificatimentioning

confidence: 99%

Image-Based Inertial Impact Test for Characterisation of Strain Rate Dependency of Ti6Al4V Titanium Alloy

et al. 2019

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In the present work Image-Based Inertial Impact (IBII) tests are performed on Ti6Al4V material. The IBII test uses an impact on the edge of the specimen to generate a short pulse that loads the specimen. Three specimen geometries have been tested: a classic rectangular specimen, and two specimen geometries with stress concentrating geometries (i.e. a hole and notches) to enhance high levels of plastic strain. Full-field measurement of the acceleration and strain are successfully used in combination with the Virtual Fields Method (VFM) to identify the strain rate sensitivity parameter of the Johnson-Cook model. The strain/strain rate spectra covered by each specimen are analysed. Finally, the influence of the virtual field used in the identification process is discussed as well as the simultaneous identification of the Johnson-Cook model strain rate sensitivity parameter and the strain rate threshold parameter.

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“…By assuming a model for the non-linear material behaviour, it should be possible to identify the parameters of the model using the VFM as in [52] for instance. This idea was suggested in [23,53] and other works have also explored the application of the VFM for rate sensitivity of plasticity in [54,55]. Image deformation will be instrumental in selecting new test configurations which sufficiently activate the non-linear response for reliable identification with the VFM, and quantifying errors introduced by the camera and full-field measurement technique.…”

Section: Characterising Non-linear Materials Behaviourmentioning

confidence: 99%

Image-Based Inertial Impact (IBII) Tests for Measuring the Interlaminar Shear Moduli of Composites

Blitterswyk

Fletcher

Pierron

2020

J. dynamic behavior mater.

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The image-based inertial impact test has previously shown that inertial effects generated with high-strain-rate loading can be used to measure the dynamic constitutive properties of composites at strain rates on the order of $$1600\,{\rm s}^{-1}$$ 1600 s - 1 . This work represents an important next step in exploring the potential of this concept with two tests presented where loading heterogeneity is exploited to measure the interlaminar shear modulus and stress–strain behaviour at high strain rates. The first test configuration used a short-beam with asymmetric loading to activate the shear behaviour. The virtual fields method was used to directly identify the interlaminar shear modulus from heterogeneous full-field maps of strain and acceleration. Simulated experiments were used to optimise the test configuration, select optimal smoothing parameters, and quantify uncertainty from grid rotation on the shear modulus identifications. The test was validated experimentally with three different virtual fields identifying an average shear modulus ranging from 5.7 to 5.9 GPa measured at $$1600\,{\rm s}^{-1}$$ 1600 s - 1 , representing a 16–19% increase compared to quasi-static measurements. The shear modulus could also be identified from shear introduced into specimens tested in the standard, end-on interlaminar IBII configuration from slight in-plane misalignments of the impactor. The identified value of 5.6 GPa validates measurements from the first configuration and also demonstrates the capability to identify multiple interlaminar stiffness parameters from a single test.

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A computational approach to design new tests for viscoplasticity characterization at high strain-rates

Cited by 22 publications

References 43 publications

Crack path tracking from full field measurements: A novel empirical methodology

Crack path tracking from full field measurements: A novel empirical methodology

Image-Based Inertial Impact Test for Characterisation of Strain Rate Dependency of Ti6Al4V Titanium Alloy

Image-Based Inertial Impact (IBII) Tests for Measuring the Interlaminar Shear Moduli of Composites

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