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Nonlinear stability analysis of sandwich wide panels - Part II: post-buckling response

[+] Author and Article Information
Zhangxian Yuan

Postdoctoral research fellow, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150
yuanzx@gatech.edu

Dr. George Kardomateas

Professor, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150
george.kardomateas@aerospace.gatech.edu

1Corresponding author.

ASME doi:10.1115/1.4039954 History: Received February 21, 2018; Revised April 05, 2018

Abstract

The nonlinear post-buckling response of sandwich panels based on the Extended High-order Sandwich Panel Theory (EHSAPT) is presented. The model includes the transverse compressibility, the axial rigidity, and the shear effect of the core. Both faces and core are considered undergoing large displacements with moderate rotations. Based on the nonlinear weak form governing equations, the post-buckling response is obtained by the arc-length continuation method together with the branch switching technique. Furthermore, the post-buckling response with imperfections is studied. The numerical examples discuss the post-buckling response corresponding to global buckling and wrinkling. It is found that due to the interaction between faces and core, localized effects may be easily initiated by imperfections after the sandwich structure has buckled globally. Furthermore, this could destabilize the post-buckling response. The post-buckling response verifies the critical load and buckling mode given by the buckling analysis in Part I. The axial rigidity of the core, although it is very small compared to that of the faces, has a significant effect on the post-buckling response.

Copyright (c) 2018 by ASME
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