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Part | Component Status | Responsible Engineers |
|---|---|---|
| Booster Forward Retention Ring | Manufacturing Prep | Chad Meier 2023 |
Purpose
The forward retention ring serves 2 main purposes:
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Must withstand the force applied by the forward closure (8836 lb)
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Must be able to interface with motor casing (23.75”)
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Must be able to interface with mission package tube (3”3.9”)
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Design
In order to accomplish the requirements, certain design considerations were made. The forward closure presses upward on the aft end of the FRR. The force it applies is equal to the chamber pressure times the inner cross-sectional area of the motor casing. The FRR must be able to withstand the load of the peak pressure (given by the Propulsion Sub-team) with a safety factor of 2. Working with Propulsion, we decided that the FRR will have 2 rows of 12 ¼-20 holes that interface with the motor casing. This was based on calculations that Prop did for the motor casing.
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Using FEA, I decided that this cross-section worked under the following conditions:
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This design has straight walls, unlike the sustainer FRR. This is because having 2 rows of bolts would make this quite difficult to manufacture. Instead, the wall thickness was decreased until the safety factor was a little above 2. The safety factor is 2.35
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