Publication Date

2016

Document Type

Dissertation/Thesis

First Advisor

Gau, Jenn-Terng

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering

LCSH

Metal foils; Titanium alloys; Metals--Formability; Deformations (Mechanics)

Abstract

Due to its hexagonal close-packed (HCP) crystal structures and limited slipping systems, commercial pure titanium shows low ductility. However, high-velocity deformation can be quite effective in increasing forming limits. In this present study, the formability of CP grade 2 titanium foils (38[micro]m) at various forming speeds were studied by experimental approach. A series of microlimited dome height ([micro]LDH) tests were conducted to examine the stamping formability of CP grade 2 titanium foils at different test speeds (0.01mm/s, 12m/s, 17m/s) on both MTS and split Hopkinson bar. Two different punch sizes (2mm, 20mm) were also used in [micro]LDH tests at quasi-static speed to study the effect of bending strain on the formability of the foils. The experimental results indicate that the formability of commercial pure titanium foil will be improved with the increasing of strain rates and smaller hemispherical punch should be used in [micro]LDH test for more accurately predicting the forming limit of material in cases where stretching and bending combined.

Comments

Advisors: Jenn-Terng Gau.||Committee members: Abhijit Gupta; Pradip Majumdar.||Includes bibliographical references.||Includes illustrations.

Extent

ix, 42 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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