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Strip tension specimens of type H-11 and SAE 4340 steel having center fatigue cracks of markedly different lengths were broken and then examined in some detail. It is possible to estimate from broken tension specimens both the elongation and the maximum strain that precedes fracture. The results reported are more exploratory than definitive, but they suggest two points: (1) High-strength steels should be evaluated in the presence of small sharp cracks that simulate the maximum stress concentration (most severe flaw) expected in the finished part, and (2) the relationship between deformation prior to fracture and the load-carrying ability of high-strength steel is obscure. Further experimental determination of the deformation that precedes fracture is needed and should be helpful in developing fracture theory.
Manning, G. K.
Technical Manager, Battelle Memorial Inst., Columbus, Ohio