Anomalous impact and strain responses in helical carbon nanotube foams

Multiscale Mass-Spring Model for High-Rate Compression of Vertically Aligned Carbon Nanotube Foams

We present a one-dimensional, multiscale mass-spring model to describe the response of vertically aligned carbon nanotube (VACNT) foams subjected to uniaxial, high-rate compressive deformations. The model uses mesoscopic dissipative spring elements composed of a lower level chain of asymmetric, bilateral, bistable elastic springs to describe the experimentally observed deformation-dependent str...

Rate-sensitive strain localization and impact response of carbon nanotube foams with microscale heterogeneous bands

We describe the deformation mechanisms and the bulk dynamic response of vertically aligned carbon nanotube (VACNT) foams comprised of bands of different densities. The densities of the bands are controlled during synthesis by varying the flow-rate of gas feedstock in discrete steps. We show that the impact response of VACNT foams can be distinctively tailored by introducing heterogeneous bands....

Control of microstructural heterogeneities in carbon nanotube foams

Arrays of aligned carbon nanotubes (CNTs) under compression are known to exhibit a dissipative hysteretic response similar to classical foams. Here, we control the microstructure of the arrays during synthesis using a variable supply of carbon source and catalyst. We control CNT alignment and density along the array height, creating bands of highand low-density regions. We study the dynamic res...

Strain rate effects in the mechanical response of polymer anchored carbon nanotube foams

Thermal Characterization of Plain and Carbon Nanotube reinforced Syntactic Foams

Composite materials fabricated using hollow microspheres are called syntactic foams. Particulate filler composites such as syntactic foams, consisting of glass microballoons and epoxy resin, are desirable for applications that require high compressive and impact strengths and low thermal conductivities. However, for heat dissipation applications, filler additions are required to increase the th...