Accession Number : ADA303079

Title :   Composite Structural Materials.

Descriptive Note : Semi-Annual progress rept. 30 Sep 84-30 Apr 85,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY

Personal Author(s) : Loewy, Robert G. ; Wiberly, Stephen E. ; Greenfield, Micheal A.

PDF Url : ADA303079

Report Date : AUG 1985

Pagination or Media Count : 85

Abstract : A resurgence of intense interest, research and applications activity mark the beginning of what may be considered the second generation of filamentary composite materials. Such interest and activity are as well-founded now as they were at the outset of the composite era more than tweny years ago. The possibility of using relatively brittle materials with high modulus, high strength, but low density in composites with good durability and high tolerance to damage and which, when they do fall, do so in a non-catastrophic manner, has been shown feasible, and the full potential is only just beginning to be realized. The promise of substantially improved performance and potentially lower costs provides the driving force behind continued research into fiber reinforced composite materials for application in aerospace hardware. Much progress has been achieved since the initial developments in the mid 1950s. Applications to primary structure have been rather limited on operational vehicles, mainly being utilized in a material-substitution mode on military aircraft. More extensive experiments, as a part of NASA's influential ACEE program, are currently underway on large airplanes in commercial passenger operation and in a few military developments, such as the AV-8B which has seen only limited service use and the X-29 which is undergoing flight tests.

Descriptors :   *FIBER REINFORCED COMPOSITES, *GRAPHITE EPOXY COMPOSITES, MECHANICAL PROPERTIES, SPACECRAFT, MILITARY AIRCRAFT, POLYMERS, COMPOSITE MATERIALS, LAMINATES, DAMAGE ASSESSMENT, METAL MATRIX COMPOSITES, CARBON FIBERS, MATRIX MATERIALS, STRAIN(MECHANICS), FRACTURE(MECHANICS), HEAT TREATMENT, LIQUID CRYSTALS, BRITTLENESS, THERMAL ANALYSIS, HIGH STRENGTH, BOUNDARY VALUE PROBLEMS, AEROSPACE CRAFT, BONDING, MICROMECHANICS, DELAMINATION.

Subject Categories : Refractory Fibers
      Laminates and Composite Materials
      Aircraft
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE