Publication Date

2017

Document Type

Dissertation/Thesis

First Advisor

Gau, Jenn-Terng

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering

LCSH

Mechanical engineering

Abstract

Recent focus in the manufacturing industry has been on micro-forming processes due to the ability to miniaturize components whilst maintaining strength. In this study, the effect of temperature on the formability of 38microm thick commercially pure titanium foil (CP-Ti) is determined. Titanium possess low ductility due to its hexagonal close-packed (HCP) crystalline structure and limited slipping systems. In Northern Illinois University's engineering materials lab, a series of micro limiting dome height (microLDH) tests were performed inside a MTS environmental heat chamber at temperatures of 100℗ʻC, 200℗ʻC and 300℗ʻC. The diameter of the punch used is 2mm and the sample sizes are 2mm, 3mm and 4mm. Analyzing the fractures using ImageJ software enabled the construction of a forming limit diagram (FLD) at each temperature. From this, a forming limit curve (FLC) was generated using the ASTM E2218-02 standard (2008) for each FLD. Comparing the FLC's low points and plane strain values reveals how the formability of CP-Ti increases as temperature increases.

Comments

Advisors: Jenn-Terng Gau.||Committee members: Iman Salehinia; Federico Sciammarella.||Includes illustrations.||Includes bibliographical references.

Extent

35 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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