A unified model for stiffness modulus of amorphous polymers across transition temperatures and strain rates

Richeton, J.; Schlatter, Guy; Vecchio, Kenneth S.; Rémond, Yves; Ahzi, Saı̈d

doi:10.1016/j.polymer.2005.06.103

Cited by 155 publications

(150 citation statements)

References 25 publications

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“…The trends are similar but the current data lie about 1 GPa above that from [24,30], while they are about 2 GPa below that in [20]. An interesting thing is the fact that the data in [30] and [20] as well as the current data (partially) evidence an inflection in the behaviour somewhere between 10 1 and 10 3 s −1 , which is not visible on both DMTA result. Nevertheless, nore experiments, at higher strain-rates, or at lower temperatures (through the time-temperature superposition principle) are be necessary to confirm the existence of such a sharp increase of the material stiffness at high strain-rate as well as the ability of high-speed tests, contrary to standard DMA, to capture it.…”

Section: Storage Modulus and Damping Identificationmentioning

confidence: 48%

“…Moreover, Fig. 15(b) shows that the systematic error slightly increases close to the sample edges which could partially explain the deviation with [30], observed in Fig. 10(a) at 10 2 s −1 .…”

Section: Synthetic Grid Deformationmentioning

confidence: 79%

“…The present results are located between that from [20], where the material was subjected to compressive tests at quasi-static (servo-hydraulic machines) and high strain-rates (SHPB), and [24,30] with data from DMTA and compressive tests on both servo-hydraulic machines and SHPB. The trends are similar but the current data lie about 1 GPa above that from [24,30], while they are about 2 GPa below that in [20]. An interesting thing is the fact that the data in [30] and [20] as well as the current data (partially) evidence an inflection in the behaviour somewhere between 10 1 and 10 3 s −1 , which is not visible on both DMTA result.…”

Section: Storage Modulus and Damping Identificationmentioning

confidence: 94%

See 2 more Smart Citations

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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Section: Storage Modulus and Damping Identificationmentioning

confidence: 48%

Section: Synthetic Grid Deformationmentioning

confidence: 79%

Section: Storage Modulus and Damping Identificationmentioning

confidence: 94%

See 1 more Smart Citation

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

Seghir

Pierron

2017

Exp Mech

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“…17). Although both high strain rate 18 and high pressure 19,20 tend to increase the T g and modulus of polymers, the classification of glass and rubber is expected to remain valid at the impact of a m-projectile because of the very low T g of PDMS and the large difference (230 1C) in T g of the respective blocks. This mechanical contrast is borne out via the observed microstructural a c b 35 mm Impact.…”

Section: Macroscopic Ballistic Impactmentioning

confidence: 99%

High strain rate deformation of layered nanocomposites

Lee

Veysset²,

Singer³

et al. 2012

Nat Commun

195

108

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Insight into the mechanical behaviour of nanomaterials under the extreme condition of very high deformation rates and to very large strains is needed to provide improved understanding for the development of new protective materials. Applications include protection against bullets for body armour, micrometeorites for satellites, and high-speed particle impact for jet engine turbine blades. Here we use a microscopic ballistic test to report the responses of periodic glassy-rubbery layered block-copolymer nanostructures to impact from hypervelocity micron-sized silica spheres. Entire deformation fields are experimentally visualized at an exceptionally high resolution (below 10 nm) and we discover how the microstructure dissipates the impact energy via layer kinking, layer compression, extreme chain conformational flattening, domain fragmentation and segmental mixing to form a liquid phase. Orientation-dependent experiments show that the dissipation can be enhanced by 30% by proper orientation of the layers.

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“…So it is necessary to develop the research of dynamic mechanical properties of PC in high speed impact conditions. A lot of investigations have been conducted by Mulliken [1], Richeton [2][3][4], Senden [5], Safari [6] and so on, which summarized previous researches and studied the dynamic mechanical properties of PC by different experiments. For higher strain rate, Carter and Marsh [7], Mori and Nagayama [8], Millett and Bourne [9] employed plate impact experiments to determine the equation of state of PC.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on dynamic mechanical behaviors of polycarbonate

Zhang¹,

Gao²,

Ye³

et al. 2017

AIP Conference Proceedings

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Abstract. Polycarbonate (PC) is a widely used engineering material in aerospace field, since it has excellent mechanical and optical property. In present study, both compressive and tensile tests of PC were conducted at high strain rates by using a split Hopkinson pressure bar. The high-speed camera and 2D Digital Image Correlation method (DIC) were used to analyze the dynamic deformation behavior of PC. Meanwhile, the plate impact experiment was carried out to measure the equation of state of PC in a single-stage gas gun, which consists of asymmetric impact technology, manganin gauges, PVDF, electromagnetic particle velocity gauges. The results indicate that the yield stress of PC increased with the strain rates in both dynamic compression and tension tests. The same phenomenon was similar to elasticity modulus at different strain rate. A constitutive model was used to describe the mechanical behaviors of PC accurately in different strain rates by contrast with the results of 2D-DIC. At last, The D-u Hugoniot curve of polycarbonate in high pressure was fitted by the least square method.

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A unified model for stiffness modulus of amorphous polymers across transition temperatures and strain rates

Cited by 155 publications

References 25 publications

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

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

High strain rate deformation of layered nanocomposites

Experimental study on dynamic mechanical behaviors of polycarbonate

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