Accession Number:

AD0753525

Title:

Crack Size and Grain Size Dependence of the Brittle Fracture Stress.

Descriptive Note:

Technical rept.,

Corporate Author:

MARYLAND UNIV COLLEGE PARK ENGINEERING MATERIALS GROUP

Personal Author(s):

• Armstrong,Ronald W.

Report Date:

1972-12-01

Pagination or Media Count:

12.0

Abstract:

The tensile brittle fracture, sigma sub c, dependence on crack size, c, is well approximated over a range of crack sizes by the relationship sigma sub c is approximately equal to sigma subo sub c k sub cc to the minus 12 power where sigma sub o sub c and k sub c are experimental constants. The positive value of sigma sub o sub c differentiates this relationship from the Irwin-Orowan expression. Some theoretical basis for sigma sub o sub c stems from the Bilby-Cottrell-Swinden expression for continuum cracking and from the Hall-Petch stress-grain size analysis for the fracture of polycrystals. Author

Descriptors:

• (*FRACTURE(MECHANICS)
• STRESSES)
• CRACKS
• GRAIN SIZE
• BRITTLENESS
• TENSILE PROPERTIES
• STEEL

Subject Categories:

• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE