Accession Number : ADA305036

Title :   PMR Polyimide/Graphite Fiber Composite Fan Blades.

Descriptive Note : Contractor rept.,

Corporate Author : TRW INC CLEVELAND OH MATERIALS TECHNOLOGY

Personal Author(s) : Cavano, P. J. ; Winters, W. E.

PDF Url : ADA305036

Report Date : 15 DEC 1976

Pagination or Media Count : 117

Abstract : Fourteen ultra-high speed fan blades, designed in accordance with the requirements of an ultrahigh tip speed blade axial flow compressor, were fabricated from a high strength graphite fiber tow and a PMR polyimide resin. Two of the blades contained glass roving hybridizing fiber. The PMR matrix was prepared by combining three monomeric reactants in methyl alcohol, and the solution was then applied directly to the reinforcing fiber for subsequent in situ polymerization, rather than employing a previously prepared prepolymer varnish. All prepreg employed on the program was prepared in house using this technique. Six of the molded blades were completely finished by secondary bonding of root pressure pads and an electroformed nickel leading edge sheath prior to final machining. The results of the spin testing of nine PMR fan blades are given. A two phase material study prior to blade fabrication included an examination of neat resin tensile properties of the PMR resin at four formulated molecular weight levels. Additionally, three formulated molecular weight levels were investigated in composite form with both a high modulus and a high strength fiber, both as molded and postcured, in room temperature and 232 C transverse tensile, flexure and short beam shear. Other preparatory work included an evaluation of five different mixed fiber orientation panels simulating potential blade constructions.

Descriptors :   *FIBER REINFORCED COMPOSITES, *GAS TURBINE BLADES, SHEAR PROPERTIES, MACHINING, POLYMERIZATION, TENSILE PROPERTIES, MOLECULAR WEIGHT, FABRICATION, CARBON FIBERS, FAN BLADES, ROOM TEMPERATURE, HIGH STRENGTH, BONDING, MIXING, SPINNING(MOTION), MOLDINGS, FLEXURAL PROPERTIES, REINFORCING MATERIALS, VARNISHES, POLYIMIDE RESINS.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE