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Mechanical Response of an Alumina-filled Epoxy at Various Strain Rates

Sandia National Laboratories, Livermore, CA 94551-0969, USA, bsong{at}sandia.gov

W. Chen

Schools of AAE & MSE, Purdue University, West Lafayette, IN 47907, USA

S.T. Montgomery

Sandia National Laboratories, Albuquerque, NM 87185-0346, USA

M.J. Forrestal

1805 Newton Pl. NE, Albuquerque, NM 87106, USA

The compressive response of an alumina-filled epoxy composite material was characterized at various strain rates using a Kolsky bar and universal testing frame (MTS). In the Kolsky-bar experiments, dynamic stress equilibrium and constant strain-rate deformation in specimens were achieved using pulse-shaping techniques. The effects of specimen aspect ratio and interfacial friction on the dynamic response of the material were examined. Compressive stress-strain curves for the composite were obtained at strain rates ranging from 9.4 x 10^-4 to 1.35 x 10³ s^-1 which exhibited strong strain-rate sensitivity. A material response model, which agrees well with the experimental measurements for the strain rates examined in this study, is also described.

Key Words: Kolsky bar • alumina-filled epoxy • stress-strain response • strain rate • material model.

Journal of Composite Materials, Vol. 43, No. 14, 1519-1536 (2009)
DOI: 10.1177/0021998308337741


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