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The vessel is a hybrid that comprises an inflatable shell attached to a rigid structure. The inflatable shell is, itself, a hybrid that comprises (1) a pressure bladder restrained against expansion by (2) a restraint layer that comprises a web of straps made from high-strength polymeric fabrics. The present improvements are intended to overcome def

Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/


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Manufacturing & Prototyping Improved Attachment in a Hybrid Inflatable Pressure Vessel Care is taken to distribute loads and maintain desired shapes. Lyndon B.
Johnson Space Center, Houston, Texas Some modifications that could be made, separately or together, have been conceived as improvements of the generic design of a structure of the type described in “Hybrid Inflatable Pressure Vessel” (MSC-23024-92), NASA Tech Briefs, Vol.
28, No.
4 (April 2004), page 44.
To recapitulate: The vessel is a hybrid that comprises an inflatable shell attached to a rigid structure.
The inflatable shell is, itself, a hybrid that comprises (1) a pressure bladder restrained against expansion by (2) a restraint layer that comprises a web of straps made from high-strength polymeric fabrics. The present improvements are intended to overcome deficiencies in those aspects of the original design that pertain to attachment of the inflatable shell to the rigid structure.
In a typical intended application, such attachment(s) would be made at one or more window or hatch frames to incorporate the windows or hatches as integral parts of the overall vessel. A detailed description of the deficiencies of the prior design, the modification(s) for overcoming each of them, and alternative versions of the modifications would greatly exceed the space available for this article.
The modifications can be summarized as being intended to effect the following improvements with respect to attachment to a window or hatch frame: • Minimizing the number of straps that pass by the frame unattached and unwoven; • Sizing the straps to distribute the loads as nearly evenly as possible among the straps in order to minimize both (1) distortion of the inflated shell and the frame from their desired shapes and (2) concentrations of stress that could lead to rupture; • Ensuring that the restraint layer and bladder conform as closely as possible to the desired restraint-layer shape all the way into the rigid frame...






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