Micromechanics simulations of the viscoelastic properties of PBX-9501 by material point method
نویسندگان
چکیده
Viscoelastic properties of the highly filled plastic-bonded explosive PBX-9501 were studied by two-dimensional dynamic Material Point Method (MPM) simulations. The upper and lower bounds for the composite properties were estimated from iso-displacement and iso-stress boundary conditions. A homogenized or “dirty” binder approach was utilized to handle the multiple length scales involved in MPM simulations of highly-filled composites with a broad distribution of filler particle sizes. Multiple time scale challenges were addressed by conducting a series of simulations in which the speed of sound of the composite was systematically varied by adjusting material point masses. This approach was used to predict the homogenized time-dependent shear modulus of PBX-9501 from nanoseconds to milliseconds yielding good agreement with experimental data.
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