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Characterization and modeling of the dynamic mechanical properties of a particulate composite material

: Corley, J.
: Thoma, K.; Hiermaier, S.


Stuttgart: Fraunhofer IRB Verlag, 2004, II, 139 S.
Zugl.: München, Univ., Diss., 2001
Schriftenreihe Forschungsergebnisse aus der Kurzzeitdynamik, 7
ISBN: 3-8167-6343-X
ISBN: 978-3-8167-6343-7
Fraunhofer EMI ()
viskoelastisches Modell; Verbundwerkstoff; energetischer Stoff; dehnratenabhängiges Verhalten; Impaktsimulation

Studying the mechanical response of particle-reinforced polymer composites to dynamic loadings has led to a better understanding of reactions observed for energetic materials from insults well below their shock-initiation threshold. Uniaxial stress and uniaxial strain experiments were conducted at strain rates ranging from quasistatic to 104 sec-1 for a highly filled, HTPB-based, cast-cure, explosive simulant. Analysis of samples recovered from high strain-rate confined compression tests evidenced the fracture of the particulate filler in some of the items. Furthermore, the parameters derived from these experiments, along with a series of numerical simulations using a two-dimensional hydrocode, were used to derive a macroscopic material model consisting of a nonlinear viscoelastic equation of state with linear viscoelastic deviatoric components. This model was validated using inverse impact experiments of "explosive"-filled penetrators and further exercised in simulations of generic explosive-filled penetrators impacting hardened targets at various velocities. Such a model is also a valuable tool for studying the response of propellant and explosive-filled hardware in accident scenarios which might occur during transport and handling.