STRV-2 payload early orbit experience and findings
Experiment results will be described for the first seven months of mission operations, as will the plans for the last few months of this one-year mission.
STRV-2 TSX-5↗
Engineering topics
Kenny, J. T.
Publications and source records attributed to Kenny, J. T..
STRV-1d QWIP technology validation in space flight
We discuss the objectives of this demonstration opportunity, and the development and test steps required to deliver the QWIP Experiment to space.
STRV-1d QWIP↗
Sustained load crack growth design data for Ti-6Al-4V titanium alloy tanks containing hydrazine
Sustained load crack growth data for Ti-6Al-4V titanium alloy in hydrazine per MIL-P-26536 and refined hydrazine are presented. Fracture mechanics data on crack growth thresholds for heat-treated forgings, aged and unaged welds, and aged and unaged heat-affected zones are reported. Fracture mechanics design curves of crack growth threshold stress intensity versus temperature are generated from 40 to 71 C.
Lewis, J. C.↗
Sustained load crack growth design data for Ti-6Al-4V titanium alloy tanks containing hydrazine
Results 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.
Lewis, J. C.↗