Texture Strengthening and Fracture Toughness of Titanium Alloy Sheet at Room and Cryogenic Temperatures PDF Download
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Author: Timothy L. Sullivan
Publisher:
ISBN:
Category : Titanium alloys
Languages : en
Pages : 44
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Book Description
Author: Timothy L. Sullivan
Publisher:
ISBN:
Category : Titanium alloys
Languages : en
Pages : 44
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Book Description
Author: TL. Sullivan
Publisher:
ISBN:
Category : Biaxial stress
Languages : en
Pages : 12
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Book Description
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.
Author: Timothy L. Sullivan
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Author: G. B. Espey
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 34
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Book Description
The 1-in. wide sharp edge notch tensile test was used to establish the notch sensitivity of several titanium sheet alloys including those of interest in the DOD Titanium Alloy Sheet Rolling Program. The influence of aging temperature was investigated in room-temperature tests and selected alloy conditions were also evaluated at -320 and -423 F. Room-temperature notch sensitivity develops with the aging reaction being most pronounced for the fully aged conditions and decreasing with overaging. A considerable reduction in notch sensitivity in some alloys can be obtained by overaging with relatively small loss in yield strength. At tensile strength to density ratios below about 1,000,000, the best ferritic steels known to the authors have notch sensitivities essentially equal to the poorest of the titanium alloys investigated. At higher strength to density values, the superiority of the titanium alloys rapidly increases. However, it should be noted that the strongest conditions of the titanium alloys possess fracture toughness, KC2, values sufficiently low that careful attention must be given to elimination of flaws in highly stressed components. At cryogenic temperatures, the titanium alloys exhibited higher notch sensitivity than alloys now normally employed for light weight cryogenic tankage. However, the -320 F and -423 F yield strength to density ratios of the commonly used materials are from 40 to 50 per cent lower than obtainable from titanium alloys. The elongation for several of the investigated titanium alloys exhibited a sharp drop between -320 F and -423 F. However, an equally sharp transition in the notch properties did not occur in this temperature range.
Author: CM. Carman
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 21
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Book Description
An investigation was performed to determine the engineering properties and plane strain fracture toughness characteristics at cryogenic temperatures for 1⁄4, 1⁄2, and 1-in.-thick plates of 5Al-2.5Sn ELI (extra low interstitial) and commercial grade titanium alloys. These results were then translated into design information data applicable to liquid-fueled rocket booster tanks for service at -320 and -423 F. The tensile properties of these materials were determined at room temperature, -110 F, -320 F, and -423 F using small round tension specimens. The plane strain fracture toughness was determined using an instrumented precracked bend specimen. The dimensions of these specimens were such that the criterion (crack length and specimen thickness are equal to 2.5 (KIc/?ys)2) was met at testing temperatures of -320 and -423 F. These data may be considered valid values of plane strain fracture toughness. The commercial 5Al-2.5Sn titanium alloy gave values of KIc of approximately 25,000 and 24,000 psi ? in. at testing temperatures of -320 and -423 F, respectively. On the other hand, the 5Al-2.5Sn ELI titanium alloy gave values of KIc of 65,000 and 55,000 psi ?in. at these testing temperatures, respectively. These data show a superiority of approximately 1.5 in terms of critical crack size for the ELI grade. The relative level of texture hardening in this material was estimated by measuring the R values of these plates. The predicted biaxial yield strength of tanks fabricated from this material was compared with experimental data.
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 472
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Book Description
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 470
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 920
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Book Description
Author: Carl M. CARMAN
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
The suitability of 5Al-2.5Sn ELI titanium alloy for cryogenic tankage applications was studied by determining the mechanical and fracture properties of the material at testing temperatures ranging from room temperature to -423F. Small round tensile specimens were developed to measure the tensile properties over the range of testing temperatures. Plane strain fracture toughness measurements were also made at these temperatures using the 'pop-in' technique with a small notched bend specimen. Special laboratory techniques were developed to test the specimens at -423F, utilizing the specific heat of vaporization of liquid helium. The degree of preferred orientation in this alloy was qualitatively studied by determining the ratio of the width strain to the thickness strain. The fracture toughness values were interpreted in terms of the crystallography and mechanism of deformation of titanium. The data are summarized in terms of a part-through defect which will be stable at various operating temperatures and stress levels. It has been shown that texture hardening may be used to obtain high burst stresses under biaxial stress conditions. (Author).
