Date of Award

3-2025

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

John S. Brewer, Jr., PhD

Abstract

This work explored combined tensile and torsional loads applied to additively manufactured Inconel 718 specimens employing Triply Periodic Minimal Surface (TPMS) structures. The gyroid TPMS unit cell was selected with two variations of cylindrical cell maps, a rectangular cell map, and a spherical cell map. All four variants were tested in an axial-torsion test frame at room temperature using equal parts of vertical and angular displacement control until failure. The combined loading in these tests utilized tension and torsion. The data from the tests were compared to finite element analysis (FEA) models to visualize when yielding was predicted. Finally, the fracture surfaces were investigated with optical and scanning electron microscopes to characterize the primarily ductile fracture.

AFIT Designator

AFIT-ENY-MS-25-M-138

Comments

An embargo was observed for posting this thesis on AFIT Scholar.

Approved for public release. PA case number 88ABW-2025-0440

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