Knoils Atomic Power Laboratory, General Electric Company,

Abstract

The yielding and fracture characteristics of Zircaloy-2 as a function of stress slate were investigated at room temperature through the medium of thin-walled cylindrical specimens under internal pressure and axial tension. Stress states from uniaxial longitudinal tension to uniaxial ta7igential tension were examined. Two tests at ele-vated temperature were performed at a single stress ratio. It was found that the fracture ductility lessened with increasing biaxiality. A mini-mum in ductility was found at balanced biaxial tension where the fracture ductility, as expressed by the effective strain, was 29 per cent. The yielding and plastic flow proper-ties were found to be highly anisotropic. Two methods were used to express the plastic flow data: a graphical approach and a theoretical analysis based on a theory proposed by R. Hill, either one of which is suitable to express the flow properties of Zircaloy-2 under various states of combined stress

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