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Thesis (M.S.)--University of Alabama at Birmingham, 2007. / Description based on contents viewed Feb. 4, 2008; title from title screen. Includes bibliographical references (p. 77-81).

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 138-140). Also available via the Internet.

Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains xix, 195 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 193-195).

Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains xviii, 141 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 140-141).

The effects of temperature and humidity cycling on mechanical properties of AS4/3501-6 quasi-isotropic composites prepared from unstitched, Kevlar 29 stitched, and S-2 glass stitched uniweave fabric were determined. Data presented include compression strengths and compression-compression fatigue results for environmentally cycled and uncycled composites. Ten1perature cycling ranged from 60°C to -55°C. The relative humidity varied between 95 percent at the high temperature and a percent at the low temperature. Microcracks which were found predominantly around individual stitches were recorded using photomicrographs taken at the end of each cycling period. The glass stitched and Kevlar stitched laminates showed significant microcracking before cycling. The unstitched uniweave material developed microcracks only after cycling. The glass stitched material had lower baseline compression strength than the unstitched and Kevlar stitched materials. Temperature and humidity cycling reduced the static compression strength of the unstitched and Kevlar stitched uniweave materials nearly 10 percent. Under the same conditions the glass stitched uniweave material lost 3 percent of its baseline strength. Combined temperature and humidity cycling did not effect the fatigue properties of the uniweave materials when the test specimens were dried to their original weights before testing. / Master of Science

The results of an experimental investigation into the compressive behavior of T300-5208 graphite/epoxy plates measuring 12.70 cm by 25.40 cm and containing circular cutouts ranging to 3.81 cm are reported. Two thicknesses, 24 ply and 48 ply were chosen to differentiate between stability failures due to buckling and strength failures due to the presence of the cutout. The critical load of the 24 ply panels was found to be independent of hole size with bifurcation occurring in the two halfwave mode longitudinally and one halfwave laterally in the quasi-isotropic panels. For the orthotropic 24 ply panels, bifurcation began in the one halfwave shape in each direction but changed to the two halfwave shape before failure. Consistent post-buckling strength was exhibited by both laminate configurations. The 48 ply specimens displayed decreasing ultimate load with increasing hole diameter to approximately 50% of the no-hole panel ultimate for a diameter-to-width ratio of 0.30. The 48 ply orthotropic panels displayed a strength/stability threshold between cutout diameters of 0.3175 cm and 0.635 cm. Panels with cutout diameters below 0.3175 cm displayed buckling before failure and those with cutouts larger than 0.635 cm experienced material failure around the hole before panel collapse. The 48 ply quasi-isotropic panels showed no sign of such a threshold with failure due to the hole occurring for all hole sizes. / Master of Science