Experimental characterization of yield induced by surface flaws.Recent experimental findings related to the surface deformation and plastic zones associated with a deep surface flaw in Mode I tension loading are surveyed. Results of front and back surface dimpling, as determined by replica profiling and interferometry, are presented. The stresses required to initiate back surface dimpling are inversely related both to the crack depth and to the crack length. The plastic zone at the crack tip is described using results obtained from Fe-3Si specimens which have been studied with the electrolytic etching technique. It is shown that the plastic zone may be identified with a state of plane strain around the entire crack perimeter, except for the very thin layer near the crack tips on the front surface, where the deformation state approximates plane stress.
Document ID
19720060564
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Francis, P. H.
Davidson, D. L. (Southwest Research Institute San Antonio, Tex., United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Subject Category
Structural Mechanics
Meeting Information
Meeting: The surface crack: Physical problems and computational solutions; Winter Annual Meeting