Date of Thesis

Spring 2025

Description

This research investigates the torsional strength of hollow aluminum shapes, specifically fairly stocky square and circular cross-sections made from 6061-T6 alloy. A total of six cross-sections were tested, with six specimens for each cross-section, resulting in 36 tests. Torque and angular deformation data were recorded for each specimen to determine the torque corresponding to full- yield of the cross-section. Additionally, Strand7 finite element models were created to simulate the experimental results and assess whether the torsional behavior could be accurately replicated through numerical analysis. This allows for future research to be conducted using Strand7 or similar finite element software.

The primary objective of this research was to evaluate the accuracy of the current design equations provided in the Aluminum Association’s Specification for Aluminum Structures (SAS), which bases the torsional limit state on first yield criteria. The findings reveal that while the existing design equations for hollow square sections accurately reflect the full-yield strength, the equations for hollow circular sections significantly underestimate their actual capacity, leading to overly conservative designs. As a result, this study proposes revised design equations specifically for hollow circular sections, accounting for full-yield behavior and providing a more accurate representation of their torsional strength. These adjustments offer a more efficient design approach, optimizing material usage without compromising safety.

Keywords

Torsion, Aluminum, Full Yield, Finite Element Modeling

Access Type

Honors Thesis

Degree Type

Bachelor of Science in Civil Engineering

Major

Civil Engineering

First Advisor

Ronald Ziemian

Second Advisor

Constance Ziemian

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