Free vibrations of sandwich plates with damaged soft-core and non-uniform mechanical properties: Modeling and Finite Element analysis

Autor: Carmelo E. Majorana, Michele Bacciocchi, Angelo Marcello Tarantino, Raimondo Luciano
Přispěvatelé: Bacciocchi M., Luciano R., Majorana C., Tarantino A.M.
Jazyk: angličtina
Rok vydání: 2019
Předmět:
free vibration
Materials science
Three-phase composite materials
Carbon nanotubes
02 engineering and technology
Carbon nanotube
Orthotropic material
lcsh:Technology
Article
law.invention
Matrix (mathematics)
0203 mechanical engineering
law
General Materials Science
carbon nanotube
Composite material
lcsh:Microscopy
Finite Element modeling
Free vibrations
Sandwich plates
Zig-zag theory
Microscale chemistry
lcsh:QC120-168.85
Parametric statistics
lcsh:QH201-278.5
lcsh:T
Isotropy
021001 nanoscience & nanotechnology
Finite element method
Vibration
020303 mechanical engineering & transports
lcsh:TA1-2040
three-phase composite material
sandwich plate
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:TK1-9971
Zdroj: Materials
Volume 12
Issue 15
Materials, Vol 12, Iss 15, p 2444 (2019)
Popis: The paper aims to investigate the natural frequencies of sandwich plates by means of a Finite Element (FE) formulation based on the Reissner-Mindlin Zig-zag (RMZ) theory. The structures are made of a damaged isotropic soft-core and two external stiffer orthotropic face-sheets. These skins are strengthened at the nanoscale level by randomly oriented Carbon nanotubes (CNTs) and are reinforced at the microscale stage by oriented straight fibers. These reinforcing phases are included in a polymer matrix and a three-phase approach based on the Eshelby-Mori-Tanaka scheme and on the Halpin-Tsai approach, which is developed to compute the overall mechanical properties of the composite material. A non-uniform distribution of the reinforcing fibers is assumed along the thickness of the skin and is modeled analytically by means of peculiar expressions given as a function of the thickness coordinate. Several parametric analyses are carried out to investigate the mechanical behavior of these multi-layered structures depending on the damage features, through-the-thickness distribution of the straight fibers, stacking sequence, and mass fraction of the constituents. Some final remarks are presented to provide useful observations and design criteria.
Databáze: OpenAIRE
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