Examination of thermal postbuckling of temperature dependent FG-GRMMC laminated beams with negative Poisson’s ratio on elastic foundations

2021 ◽  
pp. 114066
Author(s):  
Hui-Shen Shen ◽  
Y. Xiang
Keyword(s):  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Temperature Dependent ◽  
Laminated Beams ◽  
Elastic Foundations ◽  
Negative Poisson's Ratio ◽  
Thermal Postbuckling

Nonlinear dynamic response and vibration of sandwich composite plates with negative Poisson’s ratio in auxetic honeycombs

2016 ◽  
Vol 20 (6) ◽  
pp. 692-717 ◽  
Author(s):  
Duc Dinh Nguyen ◽  
Cong Hong Pham
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Core Material ◽  
Sandwich Plates ◽  
Negative Poisson’S Ratio ◽  
Nonlinear Dynamic Response ◽  
Elastic Foundations ◽  
Negative Poisson's Ratio

Auxetic cellular solids in the forms of honeycombs under blast load have great potential in a diverse range of applications, including core material in sandwich plates composite components. Based on Reddy’s first-order shear deformation plate theory, this paper presents an analysis of the nonlinear dynamic response and vibration of sandwich plates with negative Poisson’s ratio in auxetic honeycombes on elastic foundations subjected to blast and mechanical loads. A three-layer sandwich plate is considered discretized in the thickness direction by using analytical methods (stress function method, approximate solution), Galerkin method, and fourth-order Runge-Kutta method. The results show the effects of geometrical parameters, material properties, mechanical and elastic foundations on the nonlinear dynamic response, and vibration of sandwich plates.

scholarly journals Temperature-dependent negative Poisson’s ratio of monolayer graphene: Prediction from molecular dynamics simulations

2019 ◽  
Vol 8 (1) ◽  
pp. 415-421 ◽  
Author(s):  
Yin Fan ◽  
Yang Xiang ◽  
Hui-Shen Shen
Keyword(s):  
Molecular Dynamics ◽  
Graphene Sheet ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Monolayer Graphene ◽  
Pristine Graphene ◽  
Negative Poisson’S Ratio ◽  
Temperature Dependent ◽  
Free Standing ◽  
Negative Poisson's Ratio

Abstract A temperature-dependent intrinsic property of monolayer graphene, the negative Poisson’s ratio (NPR), is investigated in the present study. The classical molecular dynamics (MD) method is employed and the Erhart-Albe hybrid potential, i.e. the combination of the reactive empirical bond order (REBO) and the Tersoff potentials, is used for the graphene sheet in the numerical simulation. In the simulation process, the graphene sheet is assumed to be free standing with in-plane periodical boundary condition and under an ambient temperature up to 1000 K. Our study shows that the graphene NPR is decreased with the increase of temperature. Besides, we also perform the simulation of the graphene negative temperature expansion coefficient (NTEC) as an indirect validation of the present MD model. The characteristics of the nonlinear variations for both the NPR and the NTEC of a pristine graphene sheet are investigated. Our MD results at low temperature (0.1 K) further prove the intrinsic and anisotropic property of NPR for graphene.

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