Accession Number : AD0804605

Title :   EXPANDABLE WING TANK STRUCTURES UTILIZING THE SECOND-ORDER TRANSITION TEMPERATURE OF POLYMERIC MATERIALS.

Descriptive Note : Final rept. Jan-Dec 65,

Corporate Author : MONSANTO RESEARCH CORP DAYTON OH DAYTON LAB

Personal Author(s) : Schwendeman, J. L. ; Blount, J. D. ; Harris, J. C. ; Salyer, I. O.

Report Date : AUG 1966

Pagination or Media Count : 75

Abstract : This report concerns the demonstration of a new feasibility concept for fabrication of expandable, self-rigidizing structures, more particularly its application to F105 wing tanks. The concept is based on a fundamental property of all polymeric materials, e.g., polymeric materials change from rigid glassy substances (when below the Second Order transition temperature) to flexible rubbery substances as the temperature is raised above this transition temperature. The theoretical basis for the concept is discussed and the validity demonstrated on relatively simple structures. An extensive study of resins was made to find those suitable for this application. Several thermpolastic polymers were found that were useful over the temperature range 100 to 290 C. A number of lightly cross-linked epoxy resins were found which gave resins rigid at room temperature (25 C) while sufficiently flexible at 100-200 C to be useful in building subscale model tanks. Design considerations are discussed concerning the problem of building a collapsible tank. Work leading to a number of subscale model tanks is described. These tanks had good strength at room temperature and were sufficiently flexible at 100-120 C to collapse to a small volume. On reheating , the collpased model tanks returned to their original shape and volume without use of inflating pressure. (Author)

Descriptors :   *EXTERNAL STORES), *THERMOSETTING PLASTICS), (*EXPANDABLE STRUCTURES, (*THERMOPLASTIC RESINS, MANUFACTURING, CROSSLINKING(CHEMISTRY), TRANSITION TEMPERATURE, FEASIBILITY STUDIES, BINDERS, COMPOSITE MATERIALS, POLYVINYL CHLORIDE, OXIDES, ACRYLIC RESINS, CARBONATES, GLASS TEXTILES, SUBSTRATES, EPOXY RESINS, CURING AGENTS, AMINES, LAMINATES, FILAMENT WOUND CONSTRUCTION, POLYETHYLENE PLASTICS, IMPREGNATION, ELASTIC PROPERTIES.

Subject Categories : Aircraft
      Plastics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE