Aerothermoelastic analysis of GPL-reinforced composite lattice sandwich beams based on a refined equivalent model

被引:13
|
作者
Wang, Chunxiao [1 ]
Wang, Yuewu [1 ]
Liu, Yaze [1 ]
机构
[1] Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Nonlinear Vibrat & Strength Mech S, Beijing 100124, Peoples R China
基金
中国国家自然科学基金;
关键词
Lattice sandwich beam; graphene platelets (GPLs) reinforced composite; material; Nonuniform thermal environments; Flutter properties; Supersonic airflow; FREE-VIBRATION ANALYSIS; ELASTIC FOUNDATIONS; TRUSS CORE; FLUTTER; PANELS; PLATES; DYNAMICS;
D O I
10.1016/j.enganabound.2023.02.001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
For the first time, this paper investigates the temperature-dependent aerothermoelastic properties of nano-composite pyramidal lattice sandwich beams in supersonic airflow. A nonuniform temperature distribution along the thickness is considered. The face sheets and core of the sandwich beam are fabricated from graphene platelet (GPL)-reinforced nanocomposites. A refined thermo-mechanical equivalent model is established to determine the effective shear modulus of the lattice core subjected to a nonuniform temperature distribution. Then, the core transforms into a continuum layer. Subsequently, the beams with lattice cores were modeled as equivalent sandwich structures composed of three continuum layers. The effective modulus of elasticity of the nano-composites was calculated using the Halpin-Tsai micromechanics model combined with the mixture rule. The aerodynamic pressure was calculated using the first-order supersonic piston theory. The aerothermoelastic properties of the sandwich beam were investigated by analyzing the critical flutter aerodynamic pressure and time-dependent responses of structures. The influences of nonuniform temperature distribution, GPL re-inforcements, and end restrictions on the flutter characteristics of beams are addressed using some parameter examples.
引用
收藏
页码:56 / 69
页数:14
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