Title page for ETD etd-09122009-040516


Type of Document Master's Thesis
Author Furrow, Keith W.
URN etd-09122009-040516
Title Environmental effects on stitched RTM composites
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Loos, Alfred C. Committee Chair
Dillard, David A. Committee Member
Hyer, Michael W. Committee Member
Keywords
  • Fibrous composites
Date of Defense 1993-05-05
Availability restricted
Abstract

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.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V855_1993.F877.pdf 38.50 Mb 02:58:13 01:31:39 01:20:12 00:40:06 00:03:25
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.