Abstract
The mechanical properties of composite explosives are being studied as a function of mechanical confinement. Several techniques have been used including: a) a constant confining pressure obtained by oil immersion, and b) radial confinement of a cylindrical sample by a thick walled steel cylinder which surrounds the sample (negligible radial strain). While many energetic materials fail by crack growth when unconfined (significant surface area free of stress), with both of these forms of confinement they appear to fail by yield and plastic flow. For crystalline explosives, e.g. TNT and composition B, the yield strength and the modulus are independent of confining pressure so that useful results can be easily obtained by use of the steel cylinder technique. However, for materials containing polymer binders such as plastic bonded explosives a constant confining hydrostatic pressure is used because these same properties are found to significantly increase with this pressure. These results indicate the very significant role of the polymer binders in determining the mechanical properties of these energetic materials.
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