National Aeronautics and Space Administration (NASA)

Morphology (the study of structure and form) of the octahedral-tetrahedral (octet) truss is described. Both the geometry and symmetry of the octet truss are considered. Morphological techniques based on symmetry operations are presented which enable the derivation of reduced-part-count truss configurations from the octet truss by removing struts and nodes. These techniques are unique because their Morphological origination and they allow for the systematic generation and analysis of a large variety of structures. Methods for easily determining the part count and redundancy of infinite truss configurations are presented. Nine examples of truss configurations obtained by applying the derivation techniques are considered. These configurations are structurally stable while at the same time exhibiting significant reductions in part count. Some practical and analytical considerations, such as structural performance, regarding the example reduced-part-count truss geometries are briefly discussed. Lalvani, Haresh and Collins, Timothy J. Langley Research Center MORPHOLOGY; STRUCTURAL ANALYSIS; STRUCTURAL STABILITY; SYMMETRY; TRUSSES; DESIGN ANALYSIS; OCTETS; REDUNDANCY; STRUTS...

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