Ojo, Olorunfemi B
(2003)
Effect of Penetrator configuration and size on the dynamic behavior of composite material under high strain rate loading.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
ABSTRACTEFFECT OF PENETRATOR CONFIGURATION AND SIZE ON THE DYNAMIC BEHAVIOR OF COMPOSITE MATERIAL UNDER HIGH STRAIN RATE LOADINGOlorunfemi B. Ojo (M.SC)University of Pittsburgh, 2003Dynamic test was carried out on a plain weave carbon epoxy composites plate of different thickness (12, 16 and 24 layers) to determine the penetration and perforation threshold energies for each specimen using penetrators of different sizes and geometries namely: Protruding spherical, protruding hemispherical and conical hemispherical penetrators. The specimen damage thresholds considered in this thesis are: Below ballistic limit (BBL), at ballistic limit (BL) and above ballistic limit (ABL). Ballistic limit here is defined as the threshold energy or minimum energy that has to be exceeded before perforation takes place on the specimenHigh strain rate loading on the specimen was achieved by a newly installed Penetrating Split Hopkinson bar (P-SPHB) in the Material Behavior Lab at the University of Pittsburgh. A model 220 CCD video camera and 330 high speed imaging camera was used to measure the speed of crack propagation in the specimens. Cracks were found to propagate faster in the thinner specimen in all the damage thresholds. The ballistic limit for each specimen was experimentally determined. The result shows that sample thickness, penetrator size and geometries play a significant role in characterizing specimen damage. Energy absorption rate was found to increase as the penetrator size increased.The nature of specimen damage was found to depend on the penetrator geometry. The result also shows that strain depends on both striker impact energy and the target thickness. By varying the penetrator size and geometries it was discovered that both variables play a significant role in energy absorption rate of the specimen
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
| Creators | Email | Pitt Username | ORCID  |
|---|
| Ojo, Olorunfemi B | obo1@pitt.edu | OBO1 | |
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| ETD Committee: |
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| Date: |
3 September 2003 |
| Date Type: |
Completion |
| Defense Date: |
20 June 2003 |
| Approval Date: |
3 September 2003 |
| Submission Date: |
5 August 2003 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MSME - Master of Science in Mechanical Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Dynamic failure of composite material; Graphite epoxy woven Composite; High stain rate loading; Penetrator configuration and size; Split Hopkinson pressure bar |
| Other ID: |
http://etd.library.pitt.edu:80/ETD/available/etd-08052003-110329/, etd-08052003-110329 |
| Date Deposited: |
10 Nov 2011 19:57 |
| Last Modified: |
15 Nov 2016 13:48 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/8898 |
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