STP432

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

    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.

    Keywords:

    physical properties, fracture toughness, biaxial stress, titanium alloys, plastic Poisson's ratio, cryogenics


    Author Information:

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


    Paper ID: STP33629S

    Committee/Subcommittee: B10.01

    DOI: 10.1520/STP33629S


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