Results 91 to 100 of about 4,212 (194)
FirePhysChemThis study presents a double modification strategy to enhance hydroxyl‑terminated polybutadiene (HTPB) properties as an energetic binder. HTPB was chemically nitrated to obtain nitro-HTPB (NHTPB), then blended with nitrocellulose (NC) at different ratios
Mohammed Jouini +7 more
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Nitramine smokeless propellant research [PDF]
A transient ballistics and combustion model is derived to represent the closed vessel experiment that is widely used to characterize propellants. A computer program is developed to solve the time-dependent equations, and is applied to explain aspects of ...
Cohen, N. S., Strand, L. P.
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Investigating Premature Ignition of Thruster Pressure Cartridges by Vibration-Induced Electrostatic Discharge [PDF]
, 2010 Pyrotechnic thruster pressure cartridges (TPCs) are used for aeroshell separation on a new NASA crew launch vehicle. Nondestructive evaluation (NDE) during TPC acceptance testing indicated that internal assemblies moved during shock and vibration testing
Saulsberry, Regor, Woods, Stephen S.
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Materials & DesignConventional polyurethanes for implants suffer from hydrolytic/oxidative degradation due to ester/ether bonds. To overcome this, in this research, we have developed aging-resistant implantable medical polyurethanes to address the issue of their limited ...
Minghui Cui +9 more
doaj +1 more source
, 1978 Nitramine propellants without a pressure exponent shift in the burning rate curves are prepared by matching the burning rate of a selected nitramine or combination of nitramines within 10% of burning rate of a plasticized active binder so as to smooth ...
Cohen, N. S., Strand, L. D.
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Genetic Algorithm Optimization of a Cost Competitive Hybrid Rocket Booster [PDF]
Performance, reliability and cost have always been drivers in the rocket business. Hybrid rockets have been late entries into the launch business due to substantial early development work on liquid rockets and later on solid rockets.
Story, George
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Decomposition in HTPB bonded HMX followed by heat generation rate and chemiluminescence [PDF]
, 2018 The decomposition in HTPB bonded HMX was characterized with two highly sensitive methods: heat flow microcalorimetry (HFMC) and Chemiluminescence (CL). The material is stabilized with a phenolic antioxidant. The heat generation (HFMC) rate was determined
Bohn, M., Käser, F.
core
Propellant variability assessment [PDF]
Efforts to determine whether rocket propellant density and modulus can be reliably measured using non-destructive ultrasonic techniques are reported.
Schad, Kristin, Tytula, Thomas P.
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Mars Ascent Vehicle Hybrid Propulsion Configuration [PDF]
As part of a Mars Sample Return (MSR) campaign, two Mars Ascent Vehicle (MAV) configurations have been designed in parallel. Each ascent vehicle configuration has a different propulsion system which ultimately leads to two unique vehicle designs. As part
Schnell, Andrew, Yaghoubi, Darius
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Use of Taguchi design of experiments to optimize and increase robustness of preliminary designs [PDF]
The research performed this summer includes the completion of work begun last summer in support of the Air Launched Personnel Launch System parametric study, providing support on the development of the test matrices for the plume experiments in the Plume
Carrasco, Hector R.
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