The effect of specimen size on the mechanical response of laminated composite coupons loaded in tension and flexure
Johnson, David Page
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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/-30/9022>] 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.
- Doctoral Dissertations