The compressive behavior of isocyanate-crosslinked silica aerogel at high strain rates

Luo, Huiyang; Lu, Hongbing; Leventis, Nicholas

doi:10.1007/s11043-006-9015-0

Cited by 69 publications

(48 citation statements)

References 40 publications

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“…Luo et al studied the compressive behaviour of silicon aerogels at high strain rates [9]. They used a SHPB device coupled with a Cordin 550-62 camera (1,000 × 1,000 pixels) with an interframe time acquisition of 24 μs (frequency of 41,000 fps).…”

Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

“…In the three last quoted papers, ultra-high speed imaging systems have been used to measure full-field of rather large strains (several tens of percent) [9,10] or to extract a single displacement value from the fullfield measurement (thus not really taking advantage of the available spatial information) [11]. A very recent paper also mentions the use of a Cordin 550-32 UHS camera to measure strain maps of small magnitude [12].…”

Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

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Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

et al. 2010

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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. Abstract The present paper deals with full-field strain measurement on glass/epoxy composite tensile specimens submitted to high strain rate loading through a split Hopkinson pressure bar (SHPB) device and with the identification of their mechanical properties. First, the adopted methodology is presented: the device, including an Ultra-High Speed camera, and the experimental procedure to obtain relevant displacement maps are described. The different full-field results including displacement, strain and acceleration maps for two mechanical tests are then addressed. The last part of the paper deals with an original procedure to identify stiffnesses on this dynamic case only using the actual strain and acceleration maps (without the applied force) by using the Virtual Fields Method.

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Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

et al. 2010

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“…In this case, the most basic use of the full-field data consists in using it as a noncontact strain gauge by averaging the strains over the field of view (e.g. [12][13][14][15][16]) while checking that the strain field was reasonably uniform. Such measurements have also been used to have better insights into strain localization in uniaxial tests [17,18].…”

Section: Introductionmentioning

confidence: 99%

Beyond Hopkinson's bar

Pierron

Zhu

Siviour

2014

Phil. Trans. R. Soc. A.

122

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In order to perform experimental identification of high strain rate material models, engineers have only a very limited toolbox based on test procedures developed decades ago. The best example is the so-called split Hopkinson pressure bar based on the bar concept introduced 100 years ago by Bertram Hopkinson to measure blast pulses. The recent advent of full-field deformation measurements using imaging techniques has allowed novel approaches to be developed and exciting new testing procedures to be imagined for the first time. One can use this full-field information in conjunction with efficient numerical inverse identification tools such as the virtual fields method (VFM) to identify material parameters at high rates. The underpinning novelty is to exploit the inertial effects developed in high strain rate loading. This paper presents results from a new inertial impact test to obtain stress–strain curves at high strain rates (here, up to 3000 s −1 ). A quasi-isotropic composite specimen is equipped with a grid and images are recorded with the new HPV-X camera from Shimadzu at 5 Mfps and the SIMX16 camera from Specialised Imaging at 1 Mfps. Deformation, strain and acceleration fields are then input into the VFM to identify the stiffness parameters with unprecedented quality.

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“…It is therefore natural to expect that this new wealth of information will lead to an in-depth revisit of the high strain rate testing procedures. In the past few years, DIC has been used to acquire full-field information in the SHPB tests [8][9][10]. However, full-field deformation measurements were mainly used to provide average strains over a certain area like a non-contact strain gauge, which did not take full advantage of the strain imaging capability to measure nominally heterogeneous strain states.…”

Section: Introductionmentioning

confidence: 99%

Exploration of Saint-Venant’s Principle in Inertial High Strain Rate Testing of Materials

Zhu

Pierron

2015

Exp Mech

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Current high strain rate testing procedures of materials are limited by poor instrumentation which leads to the requirement for stringent assumptions to enable data processing and constitutive model identification. This is the case for instance for the well known Split Hopkinson Pressure Bar (SHPB) apparatus which relies on strain gauge measurements away from the deforming sample. This paper is a step forward in the exploration of novel tests based on time and space resolved kinematic measurements obtained through ultra-high speed imaging. The underpinning idea is to use acceleration fields obtained from temporal differentiation of the full-field deformation maps measured through techniques like Digital Image Correlation (DIC) or the grid method. This information is then used for inverse identification with the Virtual fields Method. The feasibility of this new methodology has been verified in the recent past on a few examples. The present paper is a new contribution towards the advancement of this idea. Here, inertial impact tests are considered. They consist of firing a small steel ball impactor at rectangular free standing quasi-isotropic composite specimens. One of the main contributions of the work is to investigate the issue of through-thickness heterogeneity of the kinematic fields through both numerical simulations (3D finite element model) and actual tests. The results show that the parasitic effects arising from non-uniform through-the-thickness loading can successfully be mitigated by the use of longer specimens, making use of Saint-Venant's principle in dynamics.

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The compressive behavior of isocyanate-crosslinked silica aerogel at high strain rates

Cited by 69 publications

References 40 publications

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

Beyond Hopkinson's bar

Exploration of Saint-Venant’s Principle in Inertial High Strain Rate Testing of Materials

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