| Type of Document |
Master's Thesis |
| Author |
Umberger, Pierce David
|
| URN |
etd-06142010-095241 |
| Title |
Characterization and Response of Thermoplastic Composites and Constituents |
| Degree |
Master of Science |
| Department |
Engineering Science and Mechanics |
| Advisory Committee |
| Advisor Name |
Title |
| Case, Scott W. |
Committee Chair |
| Batra, Romesh C. |
Committee Member |
| Hyer, Michael W. |
Committee Member |
|
| Keywords |
- UHMWPE
- Time-temperature superposition
- composite materials
|
| Date of Defense |
2010-06-01 |
| Availability |
unrestricted |
Abstract
The research presented herein is an effort to support computational modeling of ultra-high molecular weight polyethylene (UHMWPE) composites. An effort is made to characterize the composites and their constituents. UHMWPE, as a polymer, is time and temperature dependent. Using time-temperature superposition (tTSP), the constituent properties are studied as a function of strain rate. Properties that are believed to be significant are fiber tensile properties as a function of strain rate, as well as the through-thickness shear behavior of composite laminates. Obtaining fiber properties proved to be a challenge. The high strength and low surface energy of the fibers makes gripping specimens difficult. Several different methods of fixturing and gripping are investigated, eventually leading to a combination of friction and adhesion approaches where a fiber was wrapped on an adhesive coated cardboard mandrel and then gripped in the test fixture. Fiber strength is estimated using tTSP to equivalent strain rates approaching 10^6 sec^-1. Punch-shear testing of UHMWPE laminates is conducted at quasi-static strain rates and the dependence of the results on thickness and test geometry is investigated.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
Umberger_PD_T_2010.pdf |
6.88 Mb |
00:31:50 |
00:16:22 |
00:14:19 |
00:07:09 |
00:00:36 |
| |
Umberger_PD_T_2010_Copyright.pdf |
337.20 Kb |
00:01:33 |
00:00:48 |
00:00:42 |
00:00:21 |
00:00:01 |
|
