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

Seghir, Rian; Pierron, Fabrice

doi:10.1007/s11340-017-0329-4

Cited by 33 publications

(35 citation statements)

References 36 publications

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“…This enables the use of rigid-body-like virtual fields without introducing another unknown stress distribution at the other end of the considered slice. They will also apply to the IBUS test configuration [23]. Some work is underway on this.…”

Section: Discussionmentioning

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%

“…It should be noted that the quantities derived here can be applied to alternative inertial tests like the Image-Based Ultrasonic Shaking (IBUS) test. This test relies on an ultrasonic vibration to excite a thin rectangular test piece on its first resonance frequency to introduce high rate deformation [23].…”

Section: Introductionmentioning

confidence: 99%

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

Pierron

Fletcher

2019

J. dynamic behavior mater.

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“…The specimens were prepared using a PTFE mould. One face of the specimen was equipped with a grid of pitch 0.9 mm obtained by dry transfer, as detailed in [2]. The other side of the specimen was covered by black matt paint to obtain a large emissivity coefficient.…”

Section: Experimental Set-up and Data Processing 21 Experimental Set-upmentioning

confidence: 99%

“…Once displacement maps were available, spatial differentiation was used to obtain the three components of strain, and double temporal differentiation was applied to derive acceleration. This required some amount of temporal and spatial smoothing and the reader is referred to [2] for more details.…”

Section: Data Processingmentioning

confidence: 99%

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Image-based high strain rate testing of orthopaedic bone cement

et al. 2018

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Bone cement is widely used for the fixation of orthopaedic implants. It is a multi-component material that consists of a PMMA base with a small proportion of (usually ceramic) radiopacifier to enable the cement to be observed by X-ray. Bone cement is formed through an exothermic reaction in which a powder of pre-polymerised beads of PMMA reacts with MMA monomer. The resulting polymer microstructure consists of PMMA beads in a matrix of newly formed PMMA containing radiopacifier particles. In service, bone cement can experience deformation over a range of strain rates, from the lower end in normal gait to 100s of s-1 in the case of falls or impacts. In the current study, it is hypothesised that the response of homogeneous (clear) PMMA to high strain rates will be different to that of bone cement due to the microstructural differences. There have been very few studies on this topic in the past, mostly because of the difficulty involved in adapting the Hopkinson bar protocol to this material, particularly for dynamic tension. The objective of this paper is to present new results on the stiffness and damping of bone cement at strain rates in the range of 100 s-1, and to compare the data with that obtained on clear PMMA. The technique employed here to measure the mechanical properties of both commercial grade PMMA and bone cement is a new image-based DMTA method recently proposed by Seghir and Pierron (Seghir, Pierron, Exp. Mech., 2018). This allows for the measurement of the complex modulus over a range of temperatures and strain rates (100s of s-1). The method relies on imaging the deformation of the specimen bearing a printed grid using a Shimadzu HPV-X camera at up to 5 million frames per second. This allows for the time-resolved displacements to be measured, leading to fields of strain and acceleration, the latter being used to derive stress information to build up stress-strain curves. The methodology is described in more details in www.photodyn.org.

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Quantifying Ultrasonic Deformation of Cell Membranes with Ultra-High-Speed Imaging

Marek

Grazia

Régal

et al. 2021

Mechanics of Biological Systems and Materials &Amp; Micro-and Nanomechanics &Amp; Research Applications

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

Cited by 33 publications

References 36 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

Image-based high strain rate testing of orthopaedic bone cement

Quantifying Ultrasonic Deformation of Cell Membranes with Ultra-High-Speed Imaging

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