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Title: ANALYSIS OF COOK-OFF USING LOGIC MODELS

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
784540
Report Number(s):
LA-UR-01-4660
TRN: US200306%%11
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Aug 2001
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COMBUSTION KINETICS; DATA ANALYSIS; MATHEMATICAL MODELS; MATHEMATICAL LOGIC

Citation Formats

L. B. LUCK. ANALYSIS OF COOK-OFF USING LOGIC MODELS. United States: N. p., 2001. Web.
L. B. LUCK. ANALYSIS OF COOK-OFF USING LOGIC MODELS. United States.
L. B. LUCK. Wed . "ANALYSIS OF COOK-OFF USING LOGIC MODELS". United States. doi:. https://www.osti.gov/servlets/purl/784540.
@article{osti_784540,
title = {ANALYSIS OF COOK-OFF USING LOGIC MODELS},
author = {L. B. LUCK},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 2001},
month = {Wed Aug 01 00:00:00 EDT 2001}
}

Conference:
Other availability
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  • Developing a predictive model for cook-off is a difficult task. Recent experiments with PBX 9501 have shown that under certain heating and confinement conditions it is possible to generate large regions of almost uniform temperature in an explosive. Such regions react violently in a coherent fashion and may have the potential to produce unusually symmetric detonation waves in certain geometries. These results were unexpected before the experiments and have generated considerable additional activity both experimentally and in model building. At this time, there is no unambiguous explanation for the observed behavior, and therefore, there is a considerable number of fledglingmore » models in existence. These models suggest varying and possibly contradictory mechanisms to explain the thermal profiles and wave behavior data. In this paper, we present an approach to model development for cook-off of PBX 9501 based on logic models called process trees. Process trees are well-suited to the task of describing causal sequences and delineating alternative descriptions of observed phenomenology. Therefore, they provide a valuable basis for constructing physical models and integrating them.« less
  • Scalable thermal runaway models for cook-off of energetic materials (EMs) require realistic temperature- and pressure-dependent chemical reaction rates. The Sandia Instrumented Thermal Ignition apparatus was developed to provide in situ small-scale test data that address this model requirement. Spatially and temporally resolved internal temperature measurements have provided new insight into the energetic reactions occurring in PBX 9501, LX-10-2, and PBXN-109. The data have shown previously postulated reaction steps to be incorrect and suggest previously unknown reaction steps. Model adjustments based on these data have resulted in better predictions at a range of scales.
  • Abstract not provided.
  • Logic models are valuable tools in the development of predictive models for complex physical processes. The use of deductive logic in the form of a possibility tree makes it straightforward to develop a comprehensive set of unique, alternative paths that describe the system. We demonstrate the power of this approach for the complex process of cook-off of high explosives (HE). The possibility tree describes the causal paths from heating HE to the alternative end states. One of these end states is a violent reaction. Conversion of the tree to the equivalent digraph yields a valuable visualization tool for examining themore » relationships between sub-processes and provides a sound framework for the development of analytical models.« less
  • Nuclear power plants have many features in common. The functions and configuration of safety systems, and the types of components used in the systems are similar for different plants. We developed modular logic models to represent the fundamental fault logic for many commonly occurring nuclear power plant features. We further defined procedures to guide the fault tree analyst through the process of altering and connecting appropriate modular logic models to build detailed fault trees for specific systems. An interactive computer system is used to assemble and alter the modular logic models. This paper discusses the modular logic approach to faultmore » tree analysis and describes the tools currently available to support the approach.« less