EFFECT OF COMBINED STRESS ON YIELD AND FRACTURE BEHAVIOR OF ZIRCALOY-2

Technical Report · Tue Sep 15 04:00:00 EDT 1959

OSTI ID:4154797

Mehan, R L

The yielding and fracture characteristics of Zircaloy-2 as a function of stress stute were investigated at room temperature through the medium of thin- walled cylindrical specimens under internal pressure and axial tension. Stress stutes from uniaxial longitudinal tension to uniaxial tangential tension were examined. Two tests at elevated temperature were performed at a single stress ratio. It was found that the fracture ductility lessened with increasing biaxiality. A minimum in ductility was found at balanced biaxial tension where the fracture ductility, as expressed by the effective strain, was 29%. The yielding and plastic flow properties 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. Based on the results of this work, it was concluded that the effect of biaxial combined stress on the fracture ductility of Zircaloy-2 is not in itself sufficient to account for the low-ductility failures of fuel element claddings observed in some irradiation tests. (auth)

• Research Organization: Knolls Atomic Power Lab., Schenectady, N.Y.
• DOE Contract Number: W-31-109-ENG-52
• NSA Number: NSA-14-010798
• OSTI ID: 4154797
• Report Number(s): KAPL-2060
• Country of Publication: United States
• Language: English

Related Subjects

ANISOTROPY
CONFIGURATION
CREEP
CYLINDERS
DEFORMATION
DIAGRAMS
DUCTILITY
FAILURES
FUEL CANS
FUEL ELEMENTS
IRRADIATION
MATERIALS TESTING
METALS, CERAMICS, AND MATERIALS
PRESSURE
STRESSES
TEMPERATURE
THICKNESS
ZIRCALOY