Accession Number:

AD0720235

Title:

An Investigation of Stress Corrosion Crack Arrest and Crack Propagation in a Titanium Alloy

Descriptive Note:

Final rept. May 1969-Jan 1970

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

Report Date:

1970-10-01

Pagination or Media Count:

29.0

Abstract:

It was previously demonstrated that the controlling crack growth criterion in stress corrosion cracking is that derived from fracture mechanics concepts and not a criterion based on gross or net stress. This demonstration was accomplished by testing two types of cracked specimens and showing that crack arrest and crack initiation stress intensities are the same while gross and net stresses are different. However, these tests were performed on thick section material. The work now reported was intended to check the validity of the correlation between arrest and initiation stress intensities using thin section material having higher thoughness and lower yield strength than the material previously tested. The results showed crack arrest stress intensities were substantially higher than those for crack initiation when testing thin materials. It was also observed from the test results that when testing titanium materials testing must be accomplished as soon as possible after fatigue cracking to eliminate any possible effects of crack blunting.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE