Results 261 to 270 of about 7,373 (314)

The Morphological Continuum in Solid Propellant Grain Design

1970
Grain configurations for solid propellant rockets are classified by relative web thickness and mean vector direction of burning surface into a topological continuum. This ranges from the thin web dendrite (web equal to 1/6 of charge radius and entirely in the cross-section plane) thru the wagon-wheel- and star-perforated grains (1/4 to 1/2 web range ...
J.S. BILLHEIMER, F.R. WAGNER
openaire   +1 more source

Fracture of solid rocket propellant grains

Engineering Fracture Mechanics, 1992
Abstract The importance of fracture criteria in the failure assessment of solid propellant grains is briefly described. Computation of the crack tip stress intensity factor and the development of the crack growth rate equation through fracture properties essential for fracture analysis are also discussed.
openaire   +1 more source

Embedded Sensors for Monitoring Solid Propellant Grains

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2005
Rocket motors normally determine missile system service li fe. However, accurate rocket motor service life predictions are difficult and have always been compromised by both complex loading and the non -linear viscoelastic behavior of the highly filled solid propellant grains.
Herb Chelner, Jim Buswell, Danny Evans
openaire   +1 more source

Thermal Stresses in Solid Propellant Grains

Journal of Jet Propulsion, 1956
A method is presented for computing the maximum thermal stress in solid propellant grains tha t can result from temperature cycling. The method is based upon a first approximation obtained from the analytical solution for thermal stresses assuming Young's modulus to be independent of temperature.
openaire   +1 more source

Burning rate anomaly of composite propellant grains

Combustion, Explosion, and Shock Waves, 2013
In this study, characteristics of the burning rate anomaly in composite propellant grains are investigated. The burning rate anomaly has been known as the “midweb anomaly” or the “hump effect.” This paper describes some results of an experimental study on effects of propellant formulations, casting processes, and viscosity of the propellant slurry on ...
H. Hasegawa, M. Fukunaga, K. Kitagawa, T. Shimada   +3 more
openaire   +1 more source

Experimental evaluation of as-processed propellant grains

20th Joint Propulsion Conference, 1984
Grain structural integrity evaluations are generally based upon mechanical properties data obtained from tests of specimens removed from carton samples of propellant. During the past several years, Aerojet has performed numerous sample excisions and motor dissections to verify grain structural capabilities.
P.W. Veit, L.G. Landuk, G.J. Svob
openaire   +1 more source

Flame spreading and ignition transients in solid grain propellants

AIAA Journal, 1964
An analysis of grain ignition and flame spreading in solid-propellant rocket engines was performed to calculate chamber pressure as a function of time during this phase. Assumed for the analysis were isothermal one-dimensional gas flow in the chamber, spatially uniform gas pressure, two-dimensional transient heat conduction in the grain, perfect gas ...
DeSoto, S., Friedman, H. A.
openaire   +2 more sources

Dynamic Mechanical Characterization of Composite Solid Propellant for Propellant Grain Structural Integrity Assessment

Macromolecular Symposia, 2019
The objective of this work was to characterize mechanical properties of composite solid propellant in order to conduct the structural integrity assessment of propellant grain. Data required for analyses regarding loads experienced during rocket motor transportation and flight were obtained.
Gustavo Henrique Murari, Fabio Luiz Calciolari, Luis Eduardo Nunes de Almeida   +2 more
openaire   +1 more source

Recent Advances in Solid Propellant Grain Design

ARS Journal, 1959
s should be submitted to Meetings Manager, American Rocket Society, 500 Fifth Avenue, New York 36, N.Y. They will be for- warded to the appropriate Technical Committee Deadline date for abstracts is July 17.
openaire   +1 more source

Grain velocities during ignition of gun propellant

Combustion and Flame, 1975
Abstract By means of a dual-flash X-ray technique, propellant grain velocities during ignition have been determined for the Navy 5-in./38 gun. At the completion of ignition, the velocity profile along the grain bed is sharply peaked with maximun velocity at the propellant free surface.
openaire   +1 more source