Accession Number : ADA190510

Title :   The Growth of Corner Cracks Under the Conjoint Action of High and Low Cycle Fatigue.

Descriptive Note : Final rept. Jun 85-Jun 87,

Corporate Author : PORTSMOUTH POLYTECHNIC (ENGLAND) MECHANICAL BEHAVIOUR OF MATERIALS LAB

Personal Author(s) : Powell, B E ; Henderson, I ; Hall, R F

PDF Url : ADA190510

Report Date : Feb 1988

Pagination or Media Count : 98

Abstract : Fatigue crack propagation rates have been measured fo Ti-6A1-4V and Ti-5331S aeroengine disc materials using compact tension and corner notched tensile test-pieces. The loadings used simulate both the start-stop operations of aeroengines which lead to low cycle fatigue and the in-flight vibrations which may cause high cycle fatigue. It is suggested that the different fatigue crack growth behavior of Ti-5331S, relative to that of Ti-6A1-4V, arises largely from the greater proportion of crack closure and short crack growth occurring in this alloy. Keywords: Fatigue crack growth, Low/High cycle fatigue, Titanium, aluminum, Vanadium, Minor cycles, Major minor cycling.

Descriptors :   *CRACK PROPAGATION, *TITANIUM ALLOYS, ALUMINUM, CRACKS, FATIGUE, FATIGUE(MECHANICS), VANADIUM, VIBRATION, ALUMINUM, CYCLIC TESTS, FRACTOGRAPHY, MICROSTRUCTURE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE