Behavior of Ti-5Al-2.5Sn ELI titanium alloy sheet parent and weld metal in the presence of cracks at 20 K
Timothy L. Sullivan, United States. National Aeronautics and Space Administration, Lewis Research Center
National Aeronautics and Space Administration, 1971 - Technology & Engineering - 31 pages
Through- and surface-cracked specimens of two thicknesses were tested in uniaxial tension. Surface-cracked specimens were generally found to be stronger than through-cracked specimens with the same crack length. Apparent surface-crack fracture toughness calculated using the Anderson modified Irwin equation remained relatively constant for cracks as deep as 90 percent of the sheet thickness. Subcritical growth of surface cracks was investigated. Comparison of chamber and open air welds showed chamber welds to be slightly tougher. Both methods produced welds with toughness that compared favorably with that of the parent metal. Weld efficiencies were above 94 percent.
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2.8-Millimeter sheet 5-millimeter 5-millimeter-thick 5Sn ELI Titanium 8-millimeter-thick sheet Anderson's toughness eq aP denotes parent apparent fracture toughness behavior C1 chamber weld chamber and open crack depth crack tip cracked specimens Cryogenic cryostat denotes parent metal Depth to length Depth-to-thickness effect ELI TITANIUM ALLOY Fracture Mechanics Fracture stress growth took place HAZ1 heat affected zone Initial crack length Irwin method Irwin's toughness eq kilonewtons Kq calculated length ratio location and weld lower stress m1 open air millimeter-wide millimeters NASA TN open air weld parent and weld penetrated back surface Plane Strain plane stress residual stress room temperature sheet at 20 sheet thickness shown in figure SMOOTH PROPERTIES Specimen width strain gage stress intensity factor subcritical crack growth subcritical growth surface cracks SURFACE-CRACKED SPECIMEN TESTS Ti-5AI-2.5Sn ELI sheet TITANIUM ALLOY SHEET U.S. Customary Units value of Kcn weld centerline Weld efficiencies weld metal weld type yield strength zone penetrated back