Buckling analysis and design of anisogrid composite lattice conical shells

2011 ◽  
Vol 93 (12) ◽  
pp. 3150-3162 ◽  
Author(s):  
E.V. Morozov ◽  
A.V. Lopatin ◽  
V.A. Nesterov
Keyword(s):  
Buckling Analysis ◽  
Conical Shells ◽  
Analysis And Design ◽  
Composite Lattice

Tripping Analysis and Design Consideration of Permanent Means of Access Structure

2011 ◽  
Author(s):  
Ming Ma ◽  
Beom-Seon Jang ◽  
Owen F. Hughes
Keyword(s):  
Finite Element ◽  
Design Space Exploration ◽  
Solution Process ◽  
Local Buckling ◽  
Extensive Study ◽  
Buckling Analysis ◽  
Element Analysis ◽  
Analysis And Design ◽  
Linear Buckling ◽  
Linear Buckling Analysis

An efficient Rayleigh-Ritz approach is presented for analyzing the lateral-torsional buckling (“tripping”) behavior of permanent means of access (PMA) structures. Tripping failure is dangerous and often occurs when a stiffener has a tall web plate. For ordinary stiffeners of short web plates, tripping usually occurs after plate local buckling and often happens in plastic range. Since PMA structures have a wide platform for a regular walk-through inspection, they are vulnerable to elastic tripping failure and may take place prior to plate local buckling. Based on an extensive study of finite element linear buckling analysis, a strain distribution is assumed for PMA platforms. The total potential energy functional, with a parametric expression of different supporting members (flat bar, T-stiffener and angle stiffener), is formulated, and the critical tripping stress is obtained using eigenvalue approach. The method offers advantages over commonly used finite element analysis because it is mesh-free and requires only five degrees of freedom; therefore the solution process is rapid and suitable for design space exploration. The numerical results are in agreement with NX NASTRAN [1] linear buckling analysis. Design recommendations are proposed based on extensive parametric studies.

Sign in / Sign up

Export Citation Format

Share Document