Theses and Dissertations

Nolan Hoffman

Issuing Body

Mississippi State University

Advisor

Hammi, Youssef

Committee Member

Rushing, Timothy, W.

Committee Member

Priddy, Matthew, W.

Committee Member

Wilburn, Whittington

Date of Degree

5-1-2020

Original embargo terms

Worldwide

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

The low-cycle fatigue (LCF) life of the extruded aluminum alloy 6061-T6 (AA6061-T6) AM2 matting connection system was analyzed through 3D finite element modeling in conjunction with the plasticity-damage (DMG) and multi-stage fatigue (MSF) material models. The connection was modeled in ABAQUS Explicit based on the real-world boundary conditions of AM2 matting. The DMG-MSF user-defined material model characterized the low-cycle fatigue damage evolution within the microstructure of the extruded AA6061-T6 connection and utilized the maximum effective strain amplitude to predict the life of each stage of the fatigue process. It was determined that a constant displacement range of 15.17 mm generated an effective strain amplitude of 6.8E-03 mm/mm and a predicted total fatigue life within 1% to the laboratory- and full-scale data at approximately 1,122 cycles. The LCF characterization of the connection system allows for a significant reduction in laboratory- and full-scale testing for future design improvements.

URI

https://hdl.handle.net/11668/16952

Sponsorship

U.S. Army Engineering Research and Development Center

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