Overview
These fin preforms are used in the tip to tip layup of the Fin Collar to get the correct shape. They add stiffness and appropriate thermal characteristics to the leading edge of the fin.
Link to Piper's notes on Sandwich Panels and Fin Pre-Forms. This will be her working document because it allows for easier collaboration than the wiki.
Analysis
Structural Analysis
- will be developing coupons to test for stiffness, comparing sandwich coupons with laminate coupons.
- Use ASTM D7250 and ASTM D7249
Sandwich Coupon Schedules:
| Plies | Orientations of Laminate Plies | Core Direction |
|---|---|---|
| 2/felt/core/felt/2 | 45, -45 | ribbon parallel to 0 |
| 3/felt/core/felt/3 | 45, 0, -45 | ribbon parallel to 0 |
| 4/felt/core/felt/4 | 0, 45, -45, 90 | ribbon parallel to 0 |
| 5/felt/core/felt/5 | 0, 45, -45, 0, 90 | ribbon parallel to 0 |
Laminate Coupon Schedules:
| Plies | Orientation of Plies |
|---|---|
| 12 | 0, 45, -45, 90 |
| 16 | 0, 45, -45, 90 |
| 20 | 0, 45, -45, 90 |
| 24 | 0, 45, -45, 90 |