Accession Number : ADA193678

Title :   Agard (Advisory Group for Aerospace Research and Development) Engine Disc Material Cooperative Test (Supplementary Program).

Descriptive Note : Phase rept.,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DIRECTORATE

Personal Author(s) : Lee, Eun U

PDF Url : ADA193678

Report Date : 12 Aug 1987

Pagination or Media Count : 47

Abstract : From a gas turbine engine compressor spool of Ti-17 alloy, cylindrical unnotched specimens and flat double edge notched specimens were machined and fatigue-tested. The flat double edge notched specimens were also subjected to electrical potential drop measurements. The microstructure and fracture surface morphology of the representative specimens were examined. The variation of fatigue life, N, with applied stress range, delta s, was described by an equation of the form log N = a + b (delta s). The variation of normalized crack voltage, (V/V sub o)/V sub R/V sub Ro), with normalized crack length, (a/w), was given by an equation of the form (V/V sub o)/(V sub R/V sub Ro) = A + A sub 1 (a/w) + A sub 2 (a/w)sq + A sub 3 (a/w) cu. Keywords: Titanium alloys; Compressor spools; Electrical potential; Fatigue crack initiation; Fracture(Mechanics); Stress range; Crack length.

Descriptors :   *CRACKS, *TITANIUM ALLOYS, *COMPRESSOR COMPONENTS, AEROSPACE SYSTEMS, CRACKING(FRACTURING), CYLINDRICAL BODIES, EQUATIONS, FATIGUE LIFE, FATIGUE(MECHANICS), FRACTURE(MECHANICS), LENGTH, MICROSTRUCTURE, MORPHOLOGY, STRESSES, SURFACE PROPERTIES, VARIATIONS, VOLTAGE, MACHINING, DISKS, GAS TURBINES, FATIGUE TESTS(MECHANICS), FRACTOGRAPHY

Subject Categories : Properties of Metals and Alloys
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE