A numerical study of shock-induced hot spot generation in energetic material

Zhang, Yang

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https://hdl.handle.net/2142/45378 Copy

Description

Title

A numerical study of shock-induced hot spot generation in energetic material

Author(s)

Zhang, Yang

Issue Date

2013-08-22T16:38:22Z

Director of Research (if dissertation) or Advisor (if thesis)

Jackson, Thomas L.

Department of Study

Aerospace Engineering

Discipline

Aerospace Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• energetic material
• hot spot generation
• numerical simulation

Abstract

This thesis studies the formation of hot spots in energetic materials by shock initiation. A mathematical model has been developed based on viscoplastic pore collapse mechanics. Governing equations for the condensed-phase and gas-phase dynamics are derived which contain important processes including viscoplastic heating, finite-rate reaction, mass transfer and heat exchange. The system of equations are solved with two different numerical techniques. Through integration and scaling considerations, a simplifi ed model, referred to as the space-averaging model, is firstly introduced. This model generates efficient prediction to pore collapse and expansion by solving a set of ordinary diff erential equations in the gas phase. Besides, a discrete model that directly solves the partial differential governing equations for the gas-phase is also developed. Detailed information about the gas phase reaction, such as temperature, mass fraction and density distributions, can be obtained from the results. The governing equations, together with the initial and interface conditions, are solved numerically for a series of test cases for RDX (C3H6N6O6) and HMX (C4H8N8O8). The results shows that viscoplastic heating is an effective mechanism in the ignition of shocked energetic materials. In addition, it is demonstrated that the material porosity and the initial pore size have strong influence on the hot spot formation.

Graduation Semester

2013-08

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http://hdl.handle.net/2142/45378

Copyright and License Information

Copyright 2013 Yang Zhang

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