Dynamic buckling of rotationally restrained FG porous arches reinforced with graphene nanoplatelets under a uniform step load

• Published in: Thin-walled structures 2021-09, Vol.166, p.108103, Article 108103
• Main Authors: Yang, Zhicheng, Wu, Di, Yang, Jie, Lai, Siu-Kai, Lv, Jiangen, Liu, Airong, Fu, Jiyang
• Format: Article
• Language: English
• Subjects: Analytical solutions; Bifurcation dynamic buckling; Functionally graded porous arch; Graphene platelets; Limit point dynamic buckling; Uniform step loading
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2021.108103

This paper presents a dynamic buckling analysis for a rotationally restrained functionally graded (FG) graphene nanoplatelets (GPLs) reinforced composite (FG-GPLRC) porous arch under a uniform step load where GPL nanofillers are uniformly dispersed while the porosity coefficient varies along the thickness direction of the arch. The effective material properties of the FG-GPLRC porous arch are determined by the volume fraction distribution of materials. Analytical solutions for the symmetric limit point dynamic buckling and anti-symmetric bifurcation dynamic buckling loads of rotationally restrained FG-GPLRC porous arches are derived by using an energy-based approach. Critical geometric parameters that determine the dynamic buckling mode switching behavior are also identified and discussed. Depending on the geometric parameters and the rotational restraint stiffness, the FG-GPLRC porous arch can buckle in either a symmetric limit point mode or an anti-symmetric bifurcation mode dynamically. It is also found that the dynamic buckling load of the arch can be considerably improved by adding a small amount of GPLs as reinforcing nanofillers. The influences of the porosity coefficients, GPL weight fractions, arch dimensions and geometries on the dynamic buckling behavior of rotationally restrained FG-GPLRC porous arches are comprehensively investigated through extensive parametric studies. •Dynamic buckling of FG-GPLRC porous arch under uniform step load is investigated.•Analytical solutions for dynamic buckling loads are derived.•Geometric and constrained parameters governing the buckling mode are discussed.•Dynamic buckling is sensitive to GPL reinforcement, porosity and constraints.