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Effect of RIB Orientation in Isogrid Structures: Aerospace Applications


Author(s):

ANU ANTONY , MAR ATHANASIUS COLLEGE OF ENGINEERING, KOTHAMANGALAM; RESMI SS, Scientist 'SE',Structural Design & Engineering Division,Structural Engineering Entity,Vikram Sarabhai Space Centre,Indian Space Research Organization ; DEEPA VARKEY, Mar Athanasius College of Engineering,Kothamangalam, Kerala, India

Keywords:

Isogrid, Orthogrid, Horizontal ribs, Vertical ribs, Inclined Ribs, Buckling, Shell - Beam element, Shell - Shell element

Abstract:

Launch vehicle design has become presently more challenging with the requirements for faster realization with higher reliability, repeatability, lower cost and better payload capability. Isogrid structure is one of the best choice for achieving the payload gain in aerospace field. The ribs that constitute the isogrid are arranged in three categories so that a repetitive lattice of triangular cell structure is formed. This rib pattern forms triangular trusses by maintaining isotropic property. Ribs when arranged in 60ᵒ pattern is known as isogrids; when oriented in 90ᵒ pattern is termed as orthogrids. In this paper, a typical study is done on isogrid and orthogrid type of structures which comprises of ribs that are arranged in helical and orthogonal pattern. Orientation effect as well as the effect on outward and inward placement of ribs were studied. Rib and skin thickness are varied for different load cases and are analyzed for static and buckling. Different failure modes were estimated based on the finite element analysis. MSc Nastran FE tool is used for analysis and compared the results of analysis with in-house developed finite element software FEAST. From this study, it is concluded that buckling factor is high for orthogrid and isogrid structures when ribs are placed externally.


Other Details:

Manuscript Id :IJSTEV3I11165
Published in :Volume : 3, Issue : 11
Publication Date: 01/06/2017
Page(s): 319-327
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