Ajay Krishnamurthy
National Institute of Standards and Technology
DurabilityComposite numberGraphene foamUltimate tensile strengthAccelerated agingEngineeringAramidEnvironmental economicsComposite laminatesCopolymerComposite materialEpoxyNanotechnologyElectrodeGlass fiberTensile testingViscoelasticityMetallurgyMaterials scienceGraphene oxide paperPower densitySelf-assemblyEfficient energy useBody armorEnergy consumptionCoatingGraphenePolymer nanocompositeChemical engineeringCarbon nanotubePolymerLithiumDynamic mechanical analysisFibre-reinforced plasticAnodeNanocomposite
25Publications
8H-index
482Citations
Publications 25
Newest
#1Joseph M. Dennis (ARL: United States Army Research Laboratory)H-Index: 9
#2Tyler R. Long (ARL: United States Army Research Laboratory)H-Index: 3
Last. Daniel B. Knorr (ARL: United States Army Research Laboratory)H-Index: 17
view all 9 authors...
Ring-opening metathesis polymerization (ROMP) produced homopolymers and copolymers of 5-ethylidene-2-norbornene (ENB) and 5-methanol-2-norbornene (NBOH), and this provided a platform to explore the...
5 CitationsSource
#1Amy Engelbrecht-Wiggans (NIST: National Institute of Standards and Technology)H-Index: 2
#2Thanh Nhi Hoang (Montgomery College)H-Index: 1
Last. Amanda L. Forster (NIST: National Institute of Standards and Technology)H-Index: 7
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Soft body armor is typically comprised of materials such as aramid. Recently, copolymer fibers based on the combination of 5-amino-2-(p-aminophenyl) benzimidazole (PBIA) and PPTA were introduced to the body armor marketplace. The long-term stability of these copolymer fibers have not been the subject of much research, however they may be sensitive to hydrolysis due to elevated humidity because they are condensation polymers. Efforts to evaluate the impact of environmental conditions on fiber str...
1 CitationsSource
#1Amy Engelbrecht-Wiggans (NIST: National Institute of Standards and Technology)H-Index: 2
#2Faraz Burni (UMD: University of Maryland, College Park)H-Index: 2
Last. Amanda L. Forster (NIST: National Institute of Standards and Technology)H-Index: 7
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Flexible unidirectional (UD) composite laminates are commonly being used for ballistic-resistant body armor. These laminates comprise UD layers, each constructed by laminating thin layers of high-performance fibers held in place using very low modulus binder resins, with the fibers in each layer oriented parallel to each other. As these materials are used in body armor, it is important to investigate their long-term reliability, particularly with regard to exposure to temperature and humidity as...
3 CitationsSource
#1Ajay KrishnamurthyH-Index: 8
#2Ran TaoH-Index: 5
Last. Aaron M. ForsterH-Index: 14
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Source
#1Ajay KrishnamurthyH-Index: 8
#2Ran Tao (TTU: Texas Tech University)H-Index: 5
Last. Aaron M. ForsterH-Index: 14
view all 11 authors...
Carbon nanotube (CNT) grafted glass fiber reinforced epoxy nanocomposites (GFRP) present a range of stiffnesses (MPa to GPa) and length scales (μm to nm) at the fiber–matrix interface. The contribution of functionalized CNT networks to the local and bulk polymer dynamics is studied here by using a combination of torsion dynamical mechanical thermal analysis (DMTA), positron annihilation lifetime spectroscopy (PALS), and neutron scattering (NS) measurements. DMTA measurements highlight a reductio...
2 CitationsSource
#1Amy Engelbrecht-Wiggans (NIST: National Institute of Standards and Technology)H-Index: 2
#2Ajay Krishnamurthy (NIST: National Institute of Standards and Technology)H-Index: 8
Last. Amanda L. Forster (NIST: National Institute of Standards and Technology)H-Index: 7
view all 5 authors...
Many body armor designs incorporate unidirectional (UD) laminates. UD laminates are constructed of thin (<0.05 mm) layers of high-performance yarns, where the yarns in each layer are oriented parallel to each other and held in place using binder resins and thin polymer films. The armor is constructed by stacking the unidirectional layers in different orientations. To date, only very preliminary work has been performed to characterize the ageing of the binder resins used in unidirectional laminat...
1 CitationsSource
Source
#1Amanda L. Forster (NIST: National Institute of Standards and Technology)H-Index: 7
#2Viviana Rodriguez Cardenas (NIST: National Institute of Standards and Technology)H-Index: 1
Last. Nolan Gonzalez (NIST: National Institute of Standards and Technology)H-Index: 1
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Traditionally, soft body armor has been made from poly(p-phenylene terephthalamide) (PPTA) and ultra-high molecular weight polyethylene. However, to diversify the fiber choices in the United States body armor market, copolymer fibers based on the combination of 5-amino-2-(p-aminophenyl) benzimidazole (PBIA) and the more conventional PPTA were introduced. Little is known regarding the long-term stability of these fibers, but as condensation polymers, they are expected to have potential sensitivit...
2 CitationsSource
#1Bharath Natarajan (Georgetown University)H-Index: 15
#2Ajay Krishnamurthy (NIST: National Institute of Standards and Technology)H-Index: 8
Last. Jeffrey W. Gilman (NIST: National Institute of Standards and Technology)H-Index: 50
view all 11 authors...
27 CitationsSource