Equation of state and isentropic release of aluminum foam and polyvinylidene fluoride systems

There is considerable interest in developing a better understanding of the dynamic behavior of multicomponent heterogeneous systems. This study investigates and compares the dynamic response of 21% dense aluminum foam, filled with polyvinylidene fluoride (PVDF or Kynar). Experiments were conduced in...

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Bibliographic Details
Published in:Journal of applied physics 2014-06, Vol.115 (21)
Main Authors: Borg, John P., Maines, Warren R., Chhabildas, Lalit C.
Format: Article
Language:English
Subjects:
Aluminum
Applied physics
Computer simulation
Configurations
Dynamic response
Equations of state
Fluorides
Hugoniot curves
Impedance matching
Metal foams
Plane strain
Plates (structural members)
Polyvinylidene fluorides
Simulation
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Summary:There is considerable interest in developing a better understanding of the dynamic behavior of multicomponent heterogeneous systems. This study investigates and compares the dynamic response of 21% dense aluminum foam, filled with polyvinylidene fluoride (PVDF or Kynar). Experiments were conduced in a 60 mm bore gun in a one-dimensional reverse plate impact configuration at velocities ranging from 350 m/s to 2200 m/s. The particle velocity of the backside of a thin anvil, also referred to as a witness plate, was monitored with a velocity interferometer. The resulting shock Hugoniot and isentropic release states are inferred from the particle velocity records using an impedance matching technique. The experiments indicate that the heterogeneous system achieves a wide distribution of states even though it was loaded in a one-dimensional plane-strain configuration. The system maintains its strength up to shock levels near 5 GPa, above which the PVDF appears to melt upon release. Simulations were conducted using an Eulerian hydrocode where the foam filled structures are computationally resolved, i.e., mesoscale simulations. The mesoscale simulations were used to resolve not only the average response but also characterize a wide range of stress and temperature distributions during both loading and release. These simulations are in good agreement with the available experimental data and give insight into the dynamic response not accessible via experimental measurements.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4878695