Type of Document Dissertation Author Johnson, David Page URN etd-06062008-164926 Title The effect of specimen size on the mechanical response of laminated composite coupons loaded in tension and flexure Degree PhD Department Engineering Mechanics Advisory Committee
Advisor Name Title Morton, John Committee Chair Kellas, Sotiris Committee Co-Chair Davis, Richey M. Committee Member Hendricks, Scott L. Committee Member Kriz, Ronald D. Committee Member Keywords
- Laminated materials
Date of Defense 1994-04-05 Availability restricted AbstractThe effect of specimen size on the uniaxial tensile stress/strain response of sublaminate-level scaled composite specimens, and the four point flexure load/deflection response of ply- and sublaminate-level scaled composite specimens was investigated.
Three laminates were studied in the tensile program, namely [+30/-30/9022>] ns2>, [+45/-45/0/90]ns2> and [90/0/90/0]ns2>) where n = 1, 2, 3, 4. Two material systems were used) namely AS4/3502 graphite/epoxy and APC-2 graphite/PEEK, to investigate the relative effect of resin toughness.
Enhanccd X-ray radiography and edge photomicroscopy were used to examine damage development in specimens loaded to various fractions of their ultimate stress. This non-destructive examination was coupled with observations of critical events in the stress/strain response to try to correlate scaling effects with the damage development in the specimens.
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