2.0 Technical Discussion

The objective of this Phase I SBIR was to explore the potential of using various filament wound composite materials in pressure vessels intended for cryogenic applications and to gather some "real world data" on those materials. By "real world data" HEI means actual material structural performance in actual filament wound composite pressure vessels being pressurized to typical operational strain levels at cryogenic temperatures. HEI's expressed goal was to determine if typical fiber/resin systems were up to the task or if specialized materials might be required. In addition, the evaluation of a resin material developed by NASA, MSFC (which had previously shown the capacity for high elongation at cryogenic temperatures) was specifically targeted. In order to accomplish as much as possible within the budget limitations associated with a phase I SBIR it was decided to combine cost effective commercial pressure vessel technology with aerospace materials, design, and analysis techniques. This approach resulted in cost effective aluminum lined pressure vessels filament wound with high performance aerospace fibers.

The following specific technical objective "stepping stones" were identified for this study and are discussed in detail below. Steps of the investigation:

1. Select and procure candidate filament winding materials appropriate for high performance filament wound composite pressure vessel usage in cryogenic application.
2. Determine baseline cylinder designs as well as test measurement criteria.
3. Design the specific pressure vessels to be fabricated and tested; develop the necessary engineering definitions, wind patterns, etc.
4. Fabricate the test population of pressure vessels.
5. Assemble the necessary testing equipment and supplies.
6. Establish the baseline cylinder ambient performance.
7. Conduct the cryogenic testing on designated specimens.
8. Evaluate the test data.
9. Document the process, findings, and explore follow-on applications.

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HyPerComp Engineering, Inc.; SBIR NAS8-03027 Final Report