High strain rate deformation of layered nanocomposites

Lee, Jae‐Hwang; Veysset, David; Singer, Jonathan P.; Retsch, Markus; Saini, Gagan; Pézeril, Thomas; Nelson, Keith A.; Thomas, Edwin L.

doi:10.1038/ncomms2166

Cited by 176 publications

(115 citation statements)

References 43 publications

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“…Nonetheless, DMA has been limited to small strain amplitudes and has not been successful in characterizing inhomogeneous materials with intrinsic gradient in functional properties. At yet higher rates, drop ball impact testing [12], projectile impact experiments [13] and shock wave excitation [4] have been used to study the rate dependent materials behavior. For each experimental technique used, appropriate force and displacement measurement systems have been designed and improved.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

Thevamaran

Daraio

2014

Exp Mech

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We describe an experimental technique to study the dynamic behavior of complex soft materials, based on high-speed microscopic imaging and direct measurements of dynamic forces and deformations. The setup includes high sensitivity dynamic displacement measurements based on geometric moiré interferometry and high-speed imaging for in-situ, full-field visualization of the complex micro-scale dynamic deformations. The method allows extracting dynamic stress-strain profiles both from the moiré interferometry and from the high-speed microscopic imaging. We discuss the advantages of using these two complementing components concurrently. We use this technique to study the dynamic response of vertically aligned carbon nanotube foams subjected to impact loadings at variable deformation rates. The same technique can be used to study other micro-structured materials and complex hierarchical structures.

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Section: Introductionmentioning

confidence: 99%

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

Thevamaran

Daraio

2014

Exp Mech

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“…[1,2]). In these environments, composites are engineered with increasing strength and with components at scales from micron fibres to nanoscale carbon inclusions [3,4].…”

Section: Introductionmentioning

confidence: 99%

On the Shock Response of Polymers to Extreme Loading

Bourne

2016

J. dynamic behavior mater.

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This paper reviews polymer response to shock and discusses how plastics behave differently depending on the strain rate applied. The author uses polyethylene, polytetrafluroethylene, polycarbonate and epoxy as example materials. It is suggested that there are two distinct regimes of polymer response corresponding to low and high shock pressures (weak and strong shock regimes) that must be considered separately. Above a high pressure threshold it is proposed that polymers homogenize to carbon-containing structures which behave similarly. Further, the yield stress of a polymer volume element asymptotes to the theoretical strength of the material as volume shrinks to zero. It is suggested that these two behaviours reflect the same physics and this feature is common to the condition identified earlier for crystalline materials.

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“…SiC has been used in various matrices to increase the strength of the composite 9 , and aluminum particles have been introduced to epoxy to increase fracture toughness 10 . The contrast in rigidities offered by the particles and the matrix has benefits in providing energy dissipating properties which are utilized in applications for protection against micrometeorites for satellites and high-speed particle impact for jet engine turbine blades 11 . Ceramic nanocomposites, specifically, alumina particulate composites are becoming more widely used due to their low densities and relatively high strengths 12 .…”

Section: Introductionmentioning

confidence: 99%

Monitoring Strain Rate Effects on Nanocomposites using Piezospectroscopy

Durnberg

Jones

Rosas

et al. 2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Alumina nanoparticles can be added to an epoxy matrix to improve material properties and also allow for the monitoring of stress within the composite. This stress monitoring ability is enabled by the photoluminescent characteristics of alumina. Known as the piezospectroscopic effect, the characteristic R-line peaks present in the emission spectrum of alumina shift with stress. The use of piezospectroscopy to study the effects of strain rates on nanocomposites is a novel approach. In this work, alumina-epoxy nanocomposites of 4.5, 13.6 and 29.7% were investigated under low compressive strain rates of 10 −4 s −1 , 10 −3 s −1 and 10 −2 s −1 . For each volume fraction and strain rate, the R1 peak shift with respect to applied uniaxial compressive stress was observed. Results illustrate the capability of alumina nanoparticles to act as diagnostic sensors to measure the stress-induced shifts of the spectral R-line peaks under dynamic loading conditions. The range of PS coefficients measured, correlates well in comparison with static experimental behavior for similar volume fractions. Results also show that as the strain rate increases, the failure of the sample was delayed to an increased stress value. Upon further analysis of the data, a general trend of increasing sensitivity of the PS coefficients with increasing strain rate was shown. Also, the dynamic PS coefficients measured here show an increased sensitivity to stress when compared to similar materials under static conditions. This information can be used to determine the time-dependent micro-scale stresses the nanoparticles sustain during composite loading.

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High strain rate deformation of layered nanocomposites

Cited by 176 publications

References 43 publications

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

On the Shock Response of Polymers to Extreme Loading

Monitoring Strain Rate Effects on Nanocomposites using Piezospectroscopy

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