
Accession Number : AD0664691
Title : EXTERNAL CRACK PROPAGATION (CLEAVAGE) IN A CONTINUUM MODEL WITH NONLINEAR ATOMIC SEPARATION LAWS.
Descriptive Note : Technical rept.,
Corporate Author : STANFORD UNIV CALIF DIV OF ENGINEERING MECHANICS
Personal Author(s) : Goodier,J. N. ; Anderson,J. M.
Report Date : OCT 1967
Pagination or Media Count : 121
Abstract : The problem of a linear elastic solid containing two coplanar external cracks is considered. The distribution of stress in the solid when forces are applied to the crack faces is obtained. Griffith criteria are developed for the extension of the cracks under several principal cases of loading. For application to ductile materials, plastic deformation in the vicinity of the crack tips is investigated on the basis of Dugdale's hypotheses. The GoodierKanninen model is used to determine the distribution of cohesive forces near the crack tips for four nonlinear atomic forceseparation laws. The results suggest that the distribution is the same for most mobile equilibrium cracks and thus lends support to Barenblatt's hypothesis. The extension criterion obtained with the GoodierKanninen model is compared with that of the Griffith theory. (Author)
Descriptors : (*CRACK PROPAGATION, CONTINUUM MECHANICS), (*CRYSTAL DEFECTS, CRACK PROPAGATION), INTERACTIONS, ELASTIC PROPERTIES, SOLIDS, STRESSES, FORCE(MECHANICS), LOADS(FORCES), DEFORMATION, MOLECULAR ASSOCIATION, MATHEMATICAL ANALYSIS
Subject Categories : Crystallography
Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE