Plastic anisotropy of polycrystalline Zircaloy (LWBR development program)

Technical Report · Sat Jan 31 23:00:00 EST 1976

OSTI ID:4078376

Daniel, R C

A model is presented to describe the deformation of polycrystalline Zircaloy for principal stress systems coincident with the principal axes of anisotropy. Applicable to many materials which undergo prism slip and twinning, the model employs X-ray diffraction data quantitatively to specify the influence of crystallographic texture. Uniaxial test data are used to evaluate the slip stress and pole (twinning) stress as functions of strain. Contractile strain ratios and 0.2 percent offset yield stresses calculated for uniaxial tests of Zircaloy at room temperature are in satisfactory agreement with experimental values for greatly differing textures. Observed differences between tensile and compressive flow stresses are adequately represented. Strain-induced texture changes caused by twinning do not significantly affect contractile strain ratios for longitudinal (rolling or drawing direction) strains in Zircaloy fabricated by usual methods. However, the model predicts significant changes in anisotropic properties after uniaxial tensile strains parallel to directions which have high basal pole densities. The model provides improved insight into the physical significance of anisotropy parameters in continuum plasticity theory. (auth)

• Research Organization: Bettis Atomic Power Lab., West Mifflin, Pa. (USA)
• NSA Number: NSA-33-022093
• OSTI ID: 4078376
• Report Number(s): WAPD-TM--1060
• Country of Publication: United States
• Language: English

Related Subjects

*FUEL CANS-- STRESS ANALYSIS
*LWBR TYPE REACTORS-- FUEL CANS
*ZIRCALOY 2-- PLASTICITY
*ZIRCALOY 4-- PLASTICITY
210500* --Nuclear Power Plants--Power Reactors
Breeding
ANISOTROPY
COMPARATIVE EVALUATIONS
DATA
DEFORMATION
MATHEMATICAL MODELS
N50230 -- Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
N77500* --Reactors--Power Reactors
Breeding
STRESSES