Accession Number:

AD0748098

Title:

The Effects of Surface Layer on Plastic Deformation and Crack Propagation

Descriptive Note:

Semiannual rept. Jan-Jul 1972

Corporate Author:

MARTIN MARIETTA AEROSPACE DENVER CO

Personal Author(s):

• Kramer, I. R.
• Kumar, A.

Report Date:

1972-07-01

Pagination or Media Count:

83.0

Abstract:

Metallographic evidence of the existence of the surface layer is given. A relationship is given between the surface-layer stress and fatigue failure. Surface-layer stress at the root of notches is reported. The crack propagation rate for an iron-silicon alloy is reported. An attempt to detect slip-line formation and strain under sustained loads up to 500 hr. is reported.

Descriptors:

• *ALLOYS
• *CRACK PROPAGATION
• ALUMINUM ALLOYS
• DEFORMATION
• FATIGUE(MECHANICS)
• IRON ALLOYS
• MICROSTRUCTURE
• STRESSES
• SURFACE PROPERTIES
• TITANIUM ALLOYS

Subject Categories:

• Properties of Metals and Alloys
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE