Title

Stability analysis of additively manufactured isogrid

Author

Sirija Ananth

Date of Award

2015

Degree Name

M.S. in Engineering Mechanics

Department

Department of Civil and Environmental Engineering and Engineering Mechanics

Advisor/Chair

Advisor: Thomas James Whitney

Abstract

This work investigated the stability of an isogrid panel manufactured using fused deposition modelling (FDM). In particular, it verifies the use of existing closed form analytical solutions and finite element analyses for predicting both global and local buckling loads and modes for these structures FDM-produced isogrid samples were subjected to uniaxial quasi-static compression with boundary conditions approximating simple supports. Buckling values and mode shapes were obtained from Digital Image Correlation (DIC). The values obtained experimentally were compared to buckling loads calculated using finite element analysis and closed form solutions for orthotropic materials. Excellent results were obtained in comparing finite element analysis to experimental results for both global and local modes, while closed-form solutions compared well for the global modes for which the solutions were intended.

Keywords

Isogrids, Space frame structures Stability, Buckling (Mechanics), Prototypes, Engineering Testing, Aerospace Engineering, Aerospace Materials, Engineering, Mechanical Engineering, Fused Deposition Modeling, FDM, Isogrid, Buckling, DIC, anisotropic material FEA analysis, 3D printed isogrid

Rights Statement

Copyright 2015, author

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