Abstract 2

This was my first rough draft of the abstract. Bad.

Commercially Pure Grade 2 Titanium is commonly used in chemical, medical, and aerospace industries because of its high specific strength and excellent corrosion resistance. In order to limit the cost and weight in design, an accurate forming limit diagram (FLD) is desired to know the limits of the 38 micron thin foil's formability. In order to determine the equibiaxial tension portion of the FLD, experimental testing will take place with the hydraulic bulge test. In order to see any affects of bulge diameter, three different tool dies of 10 mm, 15 mm, and 20 mm will be utilized. The major and minor strains will be determined by first capturing images of the post-test grid with SEM and then using Fiji/ImagJ software. LS-DYNA software will also allow for a comparison between computational and experimental results. A linear 45 degree strain path is expected for each die diameter bulge test. A decrease in diameter is known to increase the burst pressure. The resulting forming limit diagram will help with efficient designs using Titanium thin foil. In the future, the affects of a combination of strain paths could be analyzed to determine potential new manufacturing methods.
I guess my idea of an abstract is different from what is needed for a thesis proposal abstract, which is ok. Now I will make another attempt. Some new aspects:
-Explain bulge test
-Add reasoning: testing to see if macro-scale equations still apply when going to smaller scale
-Clean up grammar, avoid using the same phrases multiple times


It is well known that the formability of metals change when moving from macro to micro scale. This study aims to get close to the tension-tension portion of the Forming Limit Curve (FLC) of 38 um thick CP Gr2 Titanium. The hydraulic bulge test involves clamping a sample to obtain a fixed boundary condition and then applying pressure on one side to promote material deformation. If the boundary is circular and secure, pure biaxial tension takes place at the top of the bulge as the material deforms. Micro limited dome height tests already produce excellent FLCs, but the equibiaxial portion is difficult to obtain due to frictional effects. The bulge test is essentially friction free due to the use of hydraulic pressure, and its data can be used to complete the FLC for CP Gr2 Ti. In order to ensure that pure biaxial tension has taken place, the strain history will be recorded by taking measurements of the strain at specific pressure intervals from the start up to the burst pressure. A grid of 50 um in diameter circles are placed on the foil and are measured post-deformation with the use of SEM and ImagJ. This thesis tests three different bulge diameters of 20 mm, 15 mm, and 10 mm. When bulge diameter decreases, size affects are expected to increase. Theoretical calculations of dome height will be compared to LS-Dyna simulations and experimental results to check whether the equations continue to apply when moving to the smaller diameter thin foil. This study will compare theoretical, numerical, and computational results in order to bridge the gap between the macro and micro scale.


I'll stop it there for today.