10.2514/6.2021-0203">
 

Designing a Vehicle of a Celestial Icosahedron Shape

Document Type

Conference Proceeding

Publication Date

1-2021

Abstract

A reduced order model has been developed to quickly evaluate the beam geometry for a celestial icosahedron for the use of a vacuum lighter than air vehicle constructed using Additive Manufacturing (AM). This model is finite element based using Abaqus B32 elements. The model represents the three segments of the characteristic triangle that make up the complete structure. The segments are modeled individually as curved beams supported at the ends clamped-radially guided fashion; preventing rotation and tangential displacement while resisting the displacement in the radial direction by a spring. An FEA based method was used to determine the load distribution onto the substructure from the spherical membrane. Several experiments have been carried out to characterized the effect of printing orientation on additively manufactured rings using Ultem 9085. The experiments were complimented by FEA models to determine the printed material modulus for the print orientations of 0 degree, 45 degrees, and 90 degrees. The moduli were determined to be 2550 MPa, 2350 MPa, and 2220 MPa for the 0, 45, and 90 degree orientations respectively. The modeling determined that the beam diameter required to support a vacuum for a 0.2032 m diameter celestial icosahedron was 4.78 mm. The maximum stress within the structure was estimated to be 41.4 MPa with an ultimate stress of 42 MPa.

Comments

This conference paper is available from AIAA via subscription or purchase through the DOI link below.

Conference Session: Buckling and Stability of Aerospace Structures I

Source Publication

AIAA Scitech 2021 Forum

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