Effects Of Through The Thickness Stitching On Impact And Interlaminar Fracture Properties Of Textile Graphite Epoxy Laminates
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Effects of Through-The-Thickness Stitching on Impact and Interlaminar Fracture Properties of Textile Graphite/Epoxy Laminates
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : |
Total Pages | : 142 |
Release | : 2018-11-18 |
Genre | : |
ISBN | : 9781731260680 |
This study investigated the effects of through-the-thickness stitching on impact damage resistance, impact damage tolerance, and mode I and mode II fracture toughness of textile graphite/epoxy laminates. Uniweave resin-transfer-molded 48 ply graphite/epoxy (AS4/3501-6) laminates were stitched with Kevlar and glass yarns of different linear densities and stitch spacings. Delaminations were implanted during processing to simulate impact damage. Sublaminate buckling tests were performed to determine the effects of stitching on the compressive strength. The results showed outstanding improvements of up to 400 percent in the compression strength over the unstitched laminates. In impact and static indentation tests the onset of damage occurred at the same level, but the extent of damage was less in stitched laminates. Mode I fracture toughness of 24 ply Uniweave unidirectional (AS4/3501-6) stitched laminates was measured by conducting double-cantilever-beam tests. The critical strain energy release rate (G(sub Ic)) was found to be up to 30 times higher than the unstitched laminates. Mode II fracture toughness of the Uniweave laminates was measured by performing end-notched-flexure tests. Two new methods to compute the apparent G(sub IIc) are presented. The apparent G(sub IIc) was found to be at least 5-15 times higher for the stitched laminates. Sharma, Suresh K. and Sankar, Bhavani V. Unspecified Center COMPRESSIVE STRENGTH; DELAMINATING; FRACTURE STRENGTH; GRAPHITE-EPOXY COMPOSITES; IMPACT RESISTANCE; IMPACT STRENGTH; LAMINATES; REINFORCING MATERIALS; YARNS; BUCKLING; COMPRESSION TESTS; GLASS; IMPACT DAMAGE; IMPACT TESTS; KEVLAR (TRADEMARK); STRAIN ENERGY RELEASE RATE...
American Society of Composites, Fourteenth International Conference Proceedings
Author | : Amer Society Composi |
Publisher | : CRC Press |
Total Pages | : 1030 |
Release | : 1999-10-25 |
Genre | : Technology & Engineering |
ISBN | : 9781566767910 |
Conference proceedings of the Fourteenth American Society for Composites held on the September 27-29 1999 at the Holiday Inn-1675 Conference Centre, Fairborn, Ohio.
Scientific and Technical Aerospace Reports
Author | : |
Publisher | : |
Total Pages | : 538 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
American Society of Composites, Ninth International Conference Proceedings
Author | : Amer Society Composi |
Publisher | : CRC Press |
Total Pages | : 1338 |
Release | : 1994-09-23 |
Genre | : Technology & Engineering |
ISBN | : 9781566762205 |
Mechanics of Textile Composites Conference
Author | : Charles E. Harris |
Publisher | : |
Total Pages | : 444 |
Release | : 1995 |
Genre | : Fibrous composites |
ISBN | : |
Proceedings of the 11th International Conference on Composite Materials
Author | : Murray L. Scott |
Publisher | : Woodhead Publishing |
Total Pages | : 976 |
Release | : 1997 |
Genre | : Technology & Engineering |
ISBN | : 9781855733558 |
Bridging the Centuries with SAMPE's Materials and Processes Technology
Author | : Steve Loud |
Publisher | : Taylor & Francis |
Total Pages | : 2381 |
Release | : 2000 |
Genre | : Technology & Engineering |
ISBN | : 0938994867 |