Dynamic Stability of Temperature-Dependent Graphene Sheet Embedded in an Elastomeric Medium

• Main Authors: Mohammad Hossein Jalaei, Rossana Dimitri, Francesco Tornabene
• Format: Article
• Language: English
• Published: MDPI AG 2019-03-01
• Series: Applied Sciences
• Subjects: dynamic stability; elastomeric foundation; Eringen’s differential constitutive model; graphene sheet; temperature-dependent properties
• Online Access: http://www.mdpi.com/2076-3417/9/5/887

: This work applies the first-order shear deformation theory (FSDT) to study the dynamic stability of orthotropic temperature-dependent single-layered graphene sheet (SLGS) embedded in a temperature-dependent elastomeric medium and subjected to a biaxial oscillating loading in a thermal environment. Possible thermal effects are considered in the size-dependent governing equations of the problem. These last ones are derived by means of the Hamilton’s variational principle combined with the Eringen’s differential constitutive model. Navier’s solution as well as Bolotin’s approach are applied to obtain the dynamic instability region (DIR) of the graphene sheet. Thus, a parametric study is carried out to explore the sensitivity of the DIR of the graphene sheet to the temperature variation, the static load factor, the aspect ratio, the foundation type, and the nonlocal parameter (NP). Results indicate that the dimensionless pulsation frequency reduces for increasing values of temperature and NP, whereas the size effect becomes even more pronounced for increasing temperatures. In addition, the adoption of temperature-dependent mechanical properties, rather than independent ones, yields a global shift of the DIR to smaller pulsating frequencies. This proves the relevance of the temperature-dependent mechanical properties to obtain reliable results, in a physical sense.