Accession Number : ADA019680

Title :   Mechanism of Subcritical Crack Growth Under Sustained Load.

Descriptive Note : Final technical rept. 1 Dec 74-30 Nov 75,


Personal Author(s) : Williams,D. N.

Report Date : NOV 1975

Pagination or Media Count : 11

Abstract : Studies were conducted to determine whether subcritical crack growth under sustained load was related to creep-rupture or hydrogen embrittlement. Crack growth in titanium alloys was strongly affected by variations in hydrogen content, indicating that hydrogen embrittlement was a primary factor. Aluminum alloys, which are not susceptible to hydrogen embrittlement, showed no evidence of subcritical crack growth under sustained load. Variations in the hydrogen content in titanium alloys also affected creep resistance and fracture toughness, both of which influenced the susceptibility to subcritical crack growth under sustained load. (Author)

Descriptors :   *Aluminum alloys, *Titanium alloys, *Crack propagation, *Hydrogen embrittlement, Creep, Rupture, Fracture(Mechanics), Loads(Forces)

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE