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Interpreting Drop-Weight Impact Results in Terms of Deformation Dependent Initiation Criteria

Published online by Cambridge University Press:  15 February 2011

P. J. Baker  and
A. M. Mellor
P. J. Baker
Affiliation:
Vanderbilt University, Department of Mechanical Engineering, Nashville, TN 37235
A. M. Mellor
Affiliation:
Vanderbilt University, Department of Mechanical Engineering, Nashville, TN 37235
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Abstract

The impact sensitivity of energetic materials is frequently measured in small-scale drop-weight tests. Plastic deformation of the sample leads to heating, the onset of chemical reaction, and eventual ignition. An analytic model provides deformation dependent estimates of the energy delivered to the sample, its stress state, and its temperature distribution. Results for hydoxy-terminated polybutadiene (HTPB/AP) propellants are interpreted in terms of two initiation criteria: critical decomposition temperature and critical thickness for shear banding. The influence of friction, impact velocity, and sample size on initiation give possible explanations of experimental results. Sample material properties variations are studied for both initiation criteria. The model includes energy localization by varying the thickness of shear layers at the sample/machine interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 296: Symposium Y – Structure and Properties of Energetic Materials , 1992 , 107
Copyright
Copyright © Materials Research Society 1993

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