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Damage development under compression-compression fatigue loading in a stitched uniwoven graphite/epoxy composite material
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Vandermey, Nancy E. Masters, John E. Morris, Don H. |
| Copyright Year | 1991 |
| Description | Damage initiation and growth under compression-compression fatigue loading were investigated for a stitched uniweave material system with an underlying AS4/3501-6 quasi-isotropic layup. Performance of unnotched specimens having stitch rows at either 0 degree or 90 degrees to the loading direction was compared. Special attention was given to the effects of stitching related manufacturing defects. Damage evaluation techniques included edge replication, stiffness monitoring, x-ray radiography, residual compressive strength, and laminate sectioning. It was found that the manufacturing defect of inclined stitches had the greatest adverse effect on material performance. Zero degree and 90 degree specimen performances were generally the same. While the stitches were the source of damage initiation, they also slowed damage propagation both along the length and across the width and affected through-the-thickness damage growth. A pinched layer zone formed by the stitches particularly affected damage initiation and growth. The compressive failure mode was transverse shear for all specimens, both in static compression and fatigue cycling effects. |
| File Size | 5169086 |
| Page Count | 126 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910018978 |
| Archival Resource Key | ark:/13960/t8z944z4f |
| Language | English |
| Publisher Date | 1991-07-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Cycles Damage Assessment Compressibility Failure Modes Compressive Strength Hazards Laminates Residual Strength Defects Textiles Crack Propagation Radiography X Rays Graphite-epoxy Composites Weaving Lay-up Stiffness Manufacturing Damage Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
