Accession Number : AD0820919

Title :   MECHANICAL PROPERTIES OF ANISOTROPIC TITANIUM ALLOY TI-5AL-2.5 SN.

Descriptive Note : Final technical rept.,

Corporate Author : ALLIED RESEARCH ASSOCIATES INC CONCORD MA

Personal Author(s) : Papirno, Ralph ; Kyle, Peter

Report Date : 18 SEP 1967

Pagination or Media Count : 43

Abstract : Experimental determinations of the anisotropy parameter R for textured titanium alloy Ti-5Al-2.5Sn in sheet form were determined from uniaxial and biaxial data based upon the Hill-Backofen plasticity theory for anisotropic materials. Uniaxial stress-strain and transverse width-thickness plastic strain data from strain gage measurements were employed to obtain uniaxial values of R. The biaxial yield strength from 1:1 stress ratio bulge tests were used with the uniaxial yield strength for the biaxial determination of R. Uniaxial values of the anisotropy parameter were considerably in excess of the biaxial values. The discrepancy may have arisen from the observed variation of R for the uniaxial data: a low value at the onset of yielding and increasing to a maximum, constant value just beyond the yield region. The results suggest that the constant plastic value of R, assumed by theory, is inappropriate but that additional test data are required before specific conclusions on the validity of the theoretical approach can be drawn. (Author)

Descriptors :   (*TITANIUM ALLOYS, TENSILE PROPERTIES), ANISOTROPY, STRESSES, STRAIN(MECHANICS), PLASTIC PROPERTIES, MICROSTRUCTURE, MEASUREMENT.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE