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 : DEC 1972

Pagination or Media Count : 12

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 sub(o sub c) + (k sub c)(c to the minus 1/2 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