Abstract
The results reported in this paper include an exploratory experimental study of small gage length fracture strains at stress concentrations and an analysis of the weakening and strengthening effects of stress concentrations in terms of a ductility ratio. The structural significance of tests used to evaluate ductility in the presence of stress concentrations are discussed, and a procedure to evaluate the ductility ratio as a basic material property is suggested. Finally, the structural s trength/ weight characteristics of various high strength sheet materials are discussed in terms of the structural design problems associated with aerospace pressure vessels.
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