Creep and Inverse Stress Relaxation Behaviors of Carbon Nanotube Yarns
Misak, Heath Edward Sabelkin, V. Miller, L. Asmatulu, Ramazan Mall, Shankar
Misak, Heath Edward
Sabelkin, V.
Miller, L.
Asmatulu, Ramazan
Mall, Shankar
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2013-12
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Article
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Keywords
Carbon nanotubes,Nanostructure Materials,Creep,Relaxation,Viscoelasticity
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Citation
Misak, Heath Edward; Sabelkin, V.; Miller, L.; Asmatulu, Ramazan; Mall, S. 2013. Creep and Inverse Stress Relaxation Behaviors of Carbon Nanotube Yarns. Journal of Nanoscience and Nanotechnology, vol. 13:no. 12, December 2013:ppg. 8331-8339(9)
Abstract
Creep, creep recovery and inverse stress relaxation behaviors of carbon nanotube yarns that consisted of 1-, 30-, and 100-yarn(s) were characterized. Primary and secondary creep stages were observed over the duration of 336 h. The primary creep stage lasted for about 4 h at an applied load equal to 75% of the ultimate tensile strength. The total strain in the primary stage was significantly larger in the carbon nanotube multi-yarn than in the carbon nanotube 1-yarn. In the secondary stage, 1-yarn also had a smaller steady state strain rate than the multi-yarn, and it was independent of number of yarns in multi-yarn. Strain response under cyclic creep loading condition was comparable to its counterpart in non-cyclic (i.e., standard) creep test except that strain response during the first cycle was slightly different from the subsequent cycles. Inverse creep (i.e., strain recovery) was observed in the 100-yarn during the cyclic creep tests after the first unloading cycle. Furthermore, inverse stress relaxation of the multi-yarns was characterized. Inverse stress relaxation was larger and for longer duration with the larger number of yarns.
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American Scientific Publishers
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Journal of Nanoscience and Nanotechnology;v.13:no.12
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1533-4880