Load-Bearing Inflatables Using Light-Curing Rigidization Technology

NASA is soliciting new concepts for lightweight stabilized inflatables in regards to low weight, high storage density, and ease of deployment. What most of the inflatable concepts are lacking is the ability for integrated structural members that do not require permanent inflation pressure. Any structure requiring inflation pressure for structural stability becomes hazardous in case of puncture due to micrometeorite impact or crew activity; it's hard enough to fix the puncture without the whole structure collapsing around the operator like a tent. Additionally the structural supports should allow for the integration of hard points or other modular functionalities. Adherent Technologies, Inc. has been actively developing stabilization concepts for space inflatables for years. Applications ranged from inflatable shelters, with or without self-healing capabilities, antenna structures, inflatable wing concepts, and structural repair tape. The technology is known as Rigidization on Command™ (ROC), and is accepted as the best solution to preserve inflatable structures in the absence of inflation pressure. The materials have been shown to store in minimal volume using both z-fold and rolling approaches, without damage to the core fiber structures. ATI is now proposing to extend the approach to structural elements to add strength to these structures, and provide building blocks for structurally challenging substructures like floors or roof supports for regolith-covered radiation resistant shelters. Resin impregnated fiberglass, carbon fiber and other advanced reinforcing materials will be used to obtain optimal mechanical properties at minimum weight. As a proof of concept, the Phase I program will concentrate on the basic unit of most modular structural construction, the I-beam. Goal of the program is a 3m demonstration beam.

Structural, load-bearing elements for a future extraterrestrial installation are nearly impossible to launch once they exceed a certain length. Beams can be assembled from shorter pieces, but suffer an excessive weight penalty in the form of fasteners. The rigidizable inflatable beams designed in this project will require minimal storage volume and can be produced to nearly any length and size while still fitting in projected launch vehicles. As such they will be an enabling technology for large living spaces on future long-duration flight missions.

The primary commercial market for inflatable rigidizable structures is in emergency or semi-permanent installations for military and relief operations. The ability to strengthen these structures with rapidly erectable structural members will greatly enhance wind resistance and the ability to carry overhead loads. With the emergence of inflatable bridge structures the use of rigidizables will be an important step forward to make such structures permanent.

This is early/mid-stage (TRL 3) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.

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