面内压缩荷载作用下双层微板系统的同步/异步屈曲

Synchronous/Asynchronous Buckling of Double-Layered Microplate Systems

采用修正的偶应力理论和双变量高阶剪切变形理论,发展了层间填充弹性介质的双层微板系统在面内压缩荷载作用下的屈曲模型.基于Euler-Lagrange方程推导了系统屈曲的控制微分方程,运用Navier法获得了上下层均为四边简支时系统同步/异步屈曲的解析解.通过数值算例讨论了系统各参数对其屈曲特性的影响.结果表明:系统的异步屈曲特性依赖于材料尺度参数、长宽比和弹性介质模量,而同步屈曲特性仅依赖于前两项,并且异步屈曲荷载高于同步屈曲荷载;弹性介质的Pasternak模量较之于Winkler模量对系统的屈曲特性影响更显著.

A linear buckling model for double-layered microplate systems filled with elastic media between layers was developed under the modified couple stress theory and the 2-variable higher-order shear deformation theory.The governing differential equations for system buckling were derived based on the Euler-Lagrange equation.With the Navier method,the synchronous and asynchronous buckling solutions were analytically obtained in the case of both upper and lower plates being simply supported on 4 edges.The influence of each parameter on the buckling characteristics of the system was discussed by numerical examples.Numerical results show that,the asynchronous buckling characteristics of the system depend on the material length scale parameter,the aspect ratio and the elastic medium modulus,while the synchronous buckling characteristics depend on the 1st 2 only;the asynchronous critical buckling load is noticeably greater than that of the synchronous buckling case;the Pasternak modulus has a more significant effect on the buckling characteristics of the system than the Winkler modulus.