A model for predicting the evolution of damage in the plastic bonded explosive LX17 /
Viscoelastic cohesive zones are employed within the framework of a finite element code to model a two-phase particle-reinforced composite material consisting of a relatively stiff aggregate embedded in a copolymer binder. The composite of interest, LX17, is noted to have a very large aggregate volu...
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Online Access: | Link to OAKTrust copy |
| Summary: | Viscoelastic cohesive zones are employed within the framework of a finite element code to model a two-phase particle-reinforced composite material consisting of a relatively stiff aggregate embedded in a copolymer binder. The composite of interest, LX17, is noted to have a very large aggregate volume fraction and as such, Voronoi tessellation has been used to generate aggregate grain boundaries within finite element meshes along which viscoelastic cohesive zones have been embedded to model the binder. It has been observed experimentally that the majority of damage in LX17 occurs within the binder, and thus, a damage evolution law has been applied to the viscoelastic cohesive zones that is phenomenological in nature. The responses obtained for the composite from the FEM analysis are then compared to the experimental data compiled by Lawrence Livermore National Labs for various constant strain rate tests conducted by Groves and Cunningham (2000). In addition, comparisons are made to a previous effort at modeling LX17 in an endeavor to demonstrate the improved effectiveness in the modeling of granular composites using viscoelastic cohesive zones with damage. Finally, results for several test cases, some with analytic solutions, are provided as validation of the FEM code employed. |
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| Item Description: | "Major subject: Aerospace Engineering". Vita. |
| Physical Description: | xii, 189 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 116-119). |