Hysteresis due to stick-slip energy dissipation in carbon nanotube (CNT) nanocomposites is experimentally observed, measured, and identified through a one-dimensional (1D) phenomenological model obtained via reduction of a three-dimensional (3D) mesoscale model. The proposed model is shown to describe the nanocomposite hysteretic response, which features the transition from the purely elastic to the post-stick-slip behavior characterized by the interfacial frictional sliding motion between the polymer chains and the CNTs. Parametric analyses shed light onto the physical meaning of each model parameter and the influence on the material response. The model parameters are determined by fitting the experimentally acquired force–displacement curves of CNT/polymer nanocomposites using a differential evolution algorithm. Nanocomposite beam-like samples made of a high performance engineering polymer and high-aspect-ratio CNTs are fabricated and tested in a bending mode at increasing deflection amplitudes. The entire time histories of the restoring force are fitted by the model through a unique set of parameters. The parameter identification is carried out for nanocomposites with various CNT weight fractions, so as to highlight the model capability to identify a wide variety of nanocomposite hysteretic behaviors through a fine tuning of its constitutive parameters. By exploiting the proposed model, a nanostructured material design and its optimization are made possible toward the exploitation of these promising materials for engineering applications.
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April 2019
Research-Article
Parametric Identification of Carbon Nanotube Nanocomposites Constitutive Response
Giovanni Formica,
Giovanni Formica
Department of Architecture,
University of Roma Tre,
Rome 00185, Italy
e-mail: giovanni.formica@uniroma3.it
University of Roma Tre,
Rome 00185, Italy
e-mail: giovanni.formica@uniroma3.it
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Michela Taló,
Michela Taló
Department of Structural and
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: michela.talo@uniroma1.it
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: michela.talo@uniroma1.it
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Giulia Lanzara,
Giulia Lanzara
Department of Engineering,
University of Roma Tre,
Rome 00146, Italy
e-mail: giulia.lanzara@uniroma3.it
University of Roma Tre,
Rome 00146, Italy
e-mail: giulia.lanzara@uniroma3.it
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Walter Lacarbonara
Walter Lacarbonara
Department of Structural and
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: walter.lacarbonara@uniroma1.it
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: walter.lacarbonara@uniroma1.it
Search for other works by this author on:
Giovanni Formica
Department of Architecture,
University of Roma Tre,
Rome 00185, Italy
e-mail: giovanni.formica@uniroma3.it
University of Roma Tre,
Rome 00185, Italy
e-mail: giovanni.formica@uniroma3.it
Michela Taló
Department of Structural and
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: michela.talo@uniroma1.it
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: michela.talo@uniroma1.it
Giulia Lanzara
Department of Engineering,
University of Roma Tre,
Rome 00146, Italy
e-mail: giulia.lanzara@uniroma3.it
University of Roma Tre,
Rome 00146, Italy
e-mail: giulia.lanzara@uniroma3.it
Walter Lacarbonara
Department of Structural and
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: walter.lacarbonara@uniroma1.it
Geotechnical Engineering,
Sapienza University of Rome,
Rome 00184, Italy
e-mail: walter.lacarbonara@uniroma1.it
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received August 2, 2018; final manuscript received November 29, 2018; published online February 14, 2019. Assoc. Editor: Junlan Wang.
J. Appl. Mech. Apr 2019, 86(4): 041007 (10 pages)
Published Online: February 14, 2019
Article history
Received:
August 2, 2018
Revised:
November 29, 2018
Citation
Formica, G., Taló, M., Lanzara, G., and Lacarbonara, W. (February 14, 2019). "Parametric Identification of Carbon Nanotube Nanocomposites Constitutive Response." ASME. J. Appl. Mech. April 2019; 86(4): 041007. https://doi.org/10.1115/1.4042137
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