SEDL / STP / STP432-EB / STP33629S

Texture Strengthening and Fracture Toughness of Titanium Alloy Sheet at Room and Cryogenic Temperatures

Sullivan, TL
Aerospace technologist, Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio

Pages: 12    Published: Jan 1968

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Abstract

Biaxial yield strengths as high as 1.53 times uniaxial yield strength were obtained from burst tests of 6-in.-diameter cylindrical pressure vessels (1 to 2 stress field) fabricated from two textured titanium alloys, Ti-4Al-0.2O and Ti-5Al-2.5Sn ELI. Material nominally 0.020 in. thick was tested at 70, -320, and -423 F. While the Ti-4Al-0.2O alloy generally had superior biaxial smooth properties at the three test temperatures, the Ti-5Al-2.5Sn ELI alloy exhibited less notch sensitivity at-320 and -423 F. It is demonstrated that plastic Poisson's ratio obtained from a uniaxial test could be used to characterize the degree of texture in the two alloys and provide a means for predicting biaxial strengthening.