Electronic Theses and Dissertations

Tarek Diab

Date

2022

Document Type

Thesis

Degree Name

Master of Science

Department

Mechanical Engineering

Committee Chair

Ali Fatemi

Committee Member

Gladius Lewis

Committee Member

Amir Hadadzadeh

Abstract

Steel alloys are commonly used as weld metal and widely used for welded steel constructions such as automobile components, pipelines, and pressure vessels. However, fatigue is a significant factor in weldments due to the flaws presented in the welds that act as stress concentrations, facilitating the development of fatigue cracks which may lead to catastrophic failure. This investigation utilized the use of ER70S-3 filler metal supplied by Hyundai Motor Company for fatigue performance investigation. Monotonic tests were performed to determine the monotonic axial and shear properties. Likewise, fatigue tests were conducted under fully-reversed loading conditions to assess the axial and shear fatigue properties. Additionally, prediction models are used to estimate weld metal’s fatigue life and cyclic properties and the outcomes are evaluated by comparing to the obtained experimental data. Furthermore, fractography of the weld steel specimens were analyzed to determine the fatigue initiation mechanism and advancement throughout the specimen gage section when subjected to cyclic axial and torsion loads.

Comments

Data is provided by the student

Library Comment

Dissertation or thesis originally submitted to ProQuest.

Notes

Open Access

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