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Effects of the Loading Direction and Contact Geometry on the High Strain Behavior of Woven Graphite/Epoxy Composites

Turan, Fatih (2011) Effects of the Loading Direction and Contact Geometry on the High Strain Behavior of Woven Graphite/Epoxy Composites. Master's Thesis, University of Pittsburgh. (Unpublished)

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High strain compressive impact testing was carried out using Split Hopkinson Pressure Bar for woven graphite/epoxy composites transversely and diametrically loaded at the impact energies of 67 J, 113J, 163 J, and 263 J. As it is hypothesized, the results show that thicker exhibit better elastic modulus and lower strain rate deformation. However, no thickness effect was observed on the energy absorption history for transversely loaded specimens even though energy absorption increases with increasing thickness for diametrically loaded specimens. The results show that energy absorption, elastic modulus, ultimate strength, and the strain rate increase with increasing applied energy as it is hypothesized. Most of the expendable energy for specimen damage returns to the system in the transverse loading case, with no visible incipient damage, while some portion of the energy absorption is consumed in the deformation process for the diametrical loading case. Smaller contact area gives larger deformation to the transversely loaded specimens resulting in lower elastic modulus, lower ultimate strength, higher energy absorption because of the energy release, and higher strain rate for the same thickness and impact energy.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Turan, Fatihfat9@pitt.eduFAT9
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWosu, Sylvanus Nwosu@pitt.eduWOSU
Committee MemberVipperman, Jeffrey Sjsv@pitt.eduJSV
Committee MemberWeiland, Lisa Mlmw36@pitt.eduLMW36
Date: 26 January 2011
Date Type: Completion
Defense Date: 22 November 2010
Approval Date: 26 January 2011
Submission Date: 3 December 2010
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 behavior; impact energy; loading direction; Split Hopkinson
Other ID:, etd-12032010-142959
Date Deposited: 10 Nov 2011 20:07
Last Modified: 15 Nov 2016 13:53


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