Title page for ETD etd-06062008-164926

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
  • Laminated materials
Date of Defense 1994-04-05
Availability restricted
The 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/-30/902] ns, [+45/-45/0/90]ns and [90/0/90/0]ns) 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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