Static and dynamic instability of functionally graded graphene origami-enabled auxetic metamaterial beams with variable thickness in fluid

• DOI: 10.1016/j.oceaneng.2023.114859
• Publication Date: 2023-05-29T10:07:16Z
• Authors: Bill Murari; Shaoyu Zhao; Yihe Zhang; Jie Yang
• Keywords: Auxetics; Elastic instability; Micromechanics; Poisson's ratio

Functionally graded (FG) graphene origami (GOri)-enabled auxetic metamaterial (GOEAM) structures have shown great potential for various engineering applications due to their exceptional mechanical and physical properties such as high strength-to-weight ratio, tuneable stiffness strength, negative Poisson's ratio (NPR). This paper aims investigate the buckling dynamic instability behaviours of FG-GOEAM beams with variable thickness immersed in a fluid, particular focus on influence NPR. The material Young's modulus GOEAM are determined by using genetic programming (GP)-based micromechanics model. Within framework first-order shear deformation theory employing Hamilton's principle modelling fluid effect added mass, governing equations motion established then discretised means differential quadrature (DQ) method obtain linear system Mathieu-Hill from which principal regions beam Bolotin's method. A comprehensive parametric study is conducted reveal effects GOri's folding degree, distribution, weight fraction, well density dimensions static fluid. Numerical results show that NPR considerably outperforms its pristine metallic counterpart terms resistance against stability.