Accession Number:

AD0603785

Title:

CRACK INITIATION IN METALLIC MATERIALS.

Descriptive Note:

Quarterly progress rept. no. 2,

Corporate Author:

SYRACUSE UNIV N Y METALLURGICAL RESEARCH LABS

Personal Author(s):

Report Date:

1964-07-01

Pagination or Media Count:

31.0

Abstract:

The mechanisms of crack initiation in LiF single crystals have been studied in Phase I and a value for Neubers finite particle size has been determined. A dislocation reaction has been proposed to account for the etch pit patterns observed at the crack tips in the LiF crystals and the strain energy obtained from this model has been compared to the strain energy obtained from continuum elasticity considerations. In Phase II, calibration of the fatigue fixture used in the experimental program has been completed and crack growth studies in fatigue specimens of AISI 301 stainless steel are under way. Studies of the stress variation due to relaxation and change in the load carrying cross sectional area in the specimen caused by the presence of the crack are also in progress. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE