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Title: Yield Surface Effects on Stability and Failure.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1376770
Report Number(s):
SAND2016-7970C
646670
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 24th International Congress of Theoretical and Applied Mechanics held August 22-26, 2016 in Montreal, Quebec, Canada.
Country of Publication:
United States
Language:
English

Citation Formats

Scherzinger, William M. Yield Surface Effects on Stability and Failure.. United States: N. p., 2016. Web.
Scherzinger, William M. Yield Surface Effects on Stability and Failure.. United States.
Scherzinger, William M. 2016. "Yield Surface Effects on Stability and Failure.". United States. doi:. https://www.osti.gov/servlets/purl/1376770.
@article{osti_1376770,
title = {Yield Surface Effects on Stability and Failure.},
author = {Scherzinger, William M.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
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  • We have made detailed measurements of the approach to steady, self-supported propagating shock waves at greatly reduced yield in composite propellants. Propa- gation velocities are less than one half the theoretical value expected for full reac- tion at the sonic plane. Previous experimental studies 1 have given evidence of similar behavior. Also, previous theoretical work 2 in an analytic form has shown the possibility of reduced yield detonations. We have developed a reaction model coupled with a hydrody- namic code that together provide a description of the coupling of the complex reac- tion behavior with shock propagation and expansion inmore » energetic materials. The model results show clearly that if the dependence of reaction rate on pressure is of sufficiently low order and the mode of consumption is by "grain burning" the calcu- lated detonation behavior closely parallels the observed non-ideal results. We describe the experiments, the reaction model, and compare experimental and calculational results. We also extend the model to predict results in the unexplored regime of very large size charges.« less
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  • Experimental results are presented from triaxial compression tests conducted at -10{degrees}C on orthotropic S2 (columnar) saline ice loaded using a true triaxial testing system configured to deliver proportional confinement. The average column diameter of the ice was 7.4 mm. Loads were applied along two directions X{sub 1} and X{sub 2} perpendicular to the growth direction, and along X{sub 1} parallel to the growth direction. Samples loaded mainly along X, were subject to independent across-column confinement R{sub 21} = {sigma}{sub 22}/{sigma}{sub 11} and to along-column confinement R{sub 31} = {sigma}{sub 33}/{sigma}{sub 11}. Samples loaded mainly along X{sub 3} were subject tomore » independent across-column confinements R{sub 13} = {sigma}{sub 11}/{sigma}{sub 33} and R{sub 23} = {sigma}{sub 22}/{sigma}{sub 33}. The applied displacement rate corresponded to a strain rate of 10{sup -2} S{sup -1} in the direction of highest load and resulted in brittle failure for all experiments. The failure stress {sigma}{sub 11,f} for loading mainly along X{sub 1} increased with increase in confinement R{sub 21} for R{sub 21} < 0.3. Within this regime the failure stress was insensitive to the level of along-column confinement R{sub 31}. For R{sub 21} {approx} 1, {sigma}{sub 11,f} of increased with increase in along-column confinement R{sub 31}. The effect of confinement for loading mainly in the along-column direction was also investigated. For R{sub 21} = 1, increasing confinement R{sub 23} increased the failure stress {sigma}{sub 33,f}.« less