Extension of the Non-linear Virtual Fields Method to Inertial Heterogeneous High Strain Rate Tests

Dreuilhe, Sarah; Pierron, Fabrice

doi:10.1007/978-3-319-22449-7_10

Cited by 2 publications

(5 citation statements)

References 4 publications

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“…The stress equations like Eq. 2, 3 and 4 can also be used in the non-linear Virtual Fields Method [18,22]. -They are limited to IBII-like configurations, in which only one specimen edge is loaded.…”

Section: Discussionmentioning

confidence: 99%

“…10. Both generalized stress-strain curves for Q 22 and Q 66 are perfectly linear and provide the reference stiffness exactly. Some scatter can be seen for Q 12 however.…”

Section: Section Transverse To the Fibresmentioning

confidence: 97%

“…In this new class of high strain rate tests, two main approaches have been used to identify the constitutive parameters. The first one is based on a full implementation of the Virtual Fields Method (VFM), with parametrized constitutive models [12,18,22]. The second one uses a reconstruction of the average longitudinal stress across a vertical section of the test specimen to build up stress-strain curves, employing rigid-body-like virtual fields in the VFM.…”

Section: Introductionmentioning

confidence: 99%

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Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

Pierron

Fletcher

2019

J. dynamic behavior mater.

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This article presents a particular use of the Virtual Fields Method to exploit the results of Image-Based Inertial Impact (IBII) tests. This test consists on an edge-on impact of a free-standing thin flat rectangular coupon. The specimen response is recorded using an ultra-high speed camera filming the deformation of a grid pattern printed at its surface. From these images, displacement fields are derived, from which strain and acceleration can be obtained. The Virtual Fields Method makes use of the acceleration fields to derive stress information. Until now, a very simple 'stress-gauge' approach was used that could only provide relevant stress-strain information if the test was predominantly uniaxial. The alternative was to use the full inverse approach with the Virtual Fields Method but this would not allow the same degree of data understanding as the 'stressgauge' approach. This article proposes an extension to this 'stress-gauge' approach for fully multiaxial tests. The equations are first derived and then validated using simulated and experimental IBII test data on isotropic and orthotropic materials.

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Section: Discussionmentioning

confidence: 99%

“…10. Both generalized stress-strain curves for Q 22 and Q 66 are perfectly linear and provide the reference stiffness exactly. Some scatter can be seen for Q 12 however.…”

Section: Section Transverse To the Fibresmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

Pierron

Fletcher

2019

J. dynamic behavior mater.

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“…The testing temperature ranged from −80 • C up to 50 • C and the data were recorded at multiple frequencies: 0.1, 0.3, 1, 3, 10 and 30 Hz. The 17.25 × 12.07 × 3 mm 3 specimen was subjected to a dual cantilever deformation mode 4 and the strain amplitude was kept lower than 0.1 %. Comparing the present "one-shot" material characterisation to DMTA and literature results, a certain discrepancy can be observed (see Fig.…”

Section: Storage Modulus and Damping Identificationmentioning

confidence: 99%

“…The concept was then extended to purely inertial tests which showed to be much more suited for this kind of analysis. The very first example dealt with concrete spalling tests [26], and was then extended to composites [27] and metals [3,4,19]. Since then, the idea has spread and several groups worldwide are starting to use the technique [13,14,16,17,21,40,41].…”

Section: Introductionmentioning

confidence: 99%

A Novel Image-based Ultrasonic Test to Map Material Mechanical Properties at High Strain-rates

Seghir

Pierron

2017

Exp Mech

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An innovative identification strategy based on high power ultrasonic loading together with both infrared thermography and ultra-high speed imaging is presented in this article. It was shown to be able to characterize the viscoelastic behaviour of a polymer specimen (PMMA) from a single sample over a range of temperatures and strainrates. The paper focuses on moderate strain-rates, i.e. from 10 to 200 s −1 , and temperatures ranging from room to the material glass transition temperature, i.e. 110 • C. The main originality lies in the fact that contrary to conventional Dynamic Mechanical Thermal Analysis (DMTA), no frequency or temperature sweep is required since the experiment is designed to simultaneously produce both a heterogeneous strain-rate state and a heterogeneous temperature state allowing a local and multi-parametric identification. This article is seminal in nature and the test presented here has good potential to tackle a range of other types of high strain-rate testing situations.

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Extension of the Non-linear Virtual Fields Method to Inertial Heterogeneous High Strain Rate Tests

Cited by 2 publications

References 4 publications

Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

A Novel Image-based Ultrasonic Test to Map Material Mechanical Properties at High Strain-rates

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