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Evaluation of thin kevlar-epoxy fabric panels subjected to shear loading (Document No: 19960020535)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Baker, Donald J. |
| Copyright Year | 1996 |
| Description | The results of an analytical and experimental investigation of 4-ply Kevlar-49-epoxy panels loaded by in-plane shear are presented. Approximately one-half of the panels are thin-core sandwich panels and the other panels are solid-laminate panels. Selected panels were impacted with an aluminum sphere at a velocity of either 150 or 220 ft/sec. The strength of panels impacted at 150 ft/sec was not reduced when compared to the strength of the undamaged panels, but the strength of panels impacted at 220 ft/sec was reduced by 27 to 40 percent. Results are presented for panels that were cyclically loaded from a load less than the buckling load to a load in the postbuckling load range. The thin-core sandwich panels had a lower fatigue life than the solid panels. The residual strength of the solid and sandwich panels cycled more than one million cycles exceeded the baseline undamaged panel strengths. The effect of hysteresis in the response of the sandwich panels is not significant. Results of a nonlinear finite element analysis conducted for each panel design are presented. |
| File Size | 4230594 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960020535 |
| Archival Resource Key | ark:/13960/t3hx68k6p |
| Language | English |
| Publisher Date | 1996-04-17 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Panels Fatigue Life Epoxy Matrix Composites Structural Failure Cyclic Loads Aircraft Construction Materials Strain Gages Velocity Distribution Impact Tests Laminates Impact Loads Sandwich Structures Displacement Residual Strength Finite Element Method Stress-strain Relationships Impact Resistance Strain Distribution Solids Fuselages Kevlar Trademark Buckling Hysteresis Shear Strain Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
