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Sustained load crack growth design data for Ti-6Al-4V titanium alloy tanks containing hydrazineResults are presented for an experimental study intended to provide sustained load crack growth (SLCG) data for Ti-6Al-4V titanium alloy tanks containing MIL-P-26536 hydrazine and refined hydrazine. Fracture mechanics data on crack growth threshold for heat-treated forgings, aged and unaged welds, and aged and unaged heat-affected zones (HAZ) are presented. All tests were made on uniaxially loaded fracture mechanics specimens involving part-through cracks, and an electrical discharge machined notch was used to start the crack. Fracture mechanics design curves of crack growth threshold stress intensity versus temperature are obtained for the temperature range 40-71 C. Major conclusions are that extreme susceptibility to SLCG in hydrazine is a universal property of unaged weld metal in Ti-6Al-4V titanium alloy of normal interstitial content, and that aging both weld metal and HAZ at 510 C for 4 hr after welding completely removes all susceptibility to SLCG induced by hydrazine, with less susceptibility to SLCG in refined hydrazine.
Document ID
19760059459
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lewis, J. C.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Kenny, J. T.
(Martin Marietta Aerospace Denver, Colo., United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1976
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA PAPER 76-769
Meeting Information
Meeting: Propulsion Conference
Location: Palo Alto, CA
Start Date: July 26, 1976
End Date: July 29, 1976
Sponsors: American Institute of Aeronautics and Astronautics and Society of Automotive Engineers
Accession Number
76A42425
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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