Publication Date


Document Type


First Advisor

Gau, Jenn-Terng

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering


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


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.


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


ix, 42 pages




Northern Illinois University

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