TY - GEN
T1 - Characterization and modeling of polymeric matrix under static and dynamic loading
AU - Werner, Brian T.
AU - Daniel, Isaac M.
N1 - Funding Information:
The work described in this paper was sponsored by the Solid Mechanics Program of the Office of Naval Research (ONR). We are grateful to Dr. Y. D. S. Rajapakse of ONR for his encouragement and cooperation.
PY - 2013
Y1 - 2013
N2 - A polymeric matrix (3501-6) used in composite materials was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic ones. Tests were conducted under uniaxial compression, tension, pure shear and combinations of compression and shear. Quasi-static and intermediate strain rate tests were conducted in a servo-hydraulic testing machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar (Kolsky bar) system built for the purpose. This SHPB system was made of a glass/epoxy composite (Garolite) bars having an impedance that is closer to that of the test polymer than metals. The typical stress-strain behavior of the polymeric matrix exhibits a linear elastic region up to a yield point, a nonlinear elastoplastic region up to an initial peak or "critical stress," followed by a strain softening region up to a local minimum and finally, a strain hardening region up to ultimate failure. A general three-dimensional elasto-viscoplastic model was developed incorporating strain rate effects, and including the large deformation region. The model was formulated in strain space unlike most models in the literature. The stress-strain curves obtained were used to develop and validate the new elasto-viscoplastic constitutive model.
AB - A polymeric matrix (3501-6) used in composite materials was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic ones. Tests were conducted under uniaxial compression, tension, pure shear and combinations of compression and shear. Quasi-static and intermediate strain rate tests were conducted in a servo-hydraulic testing machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar (Kolsky bar) system built for the purpose. This SHPB system was made of a glass/epoxy composite (Garolite) bars having an impedance that is closer to that of the test polymer than metals. The typical stress-strain behavior of the polymeric matrix exhibits a linear elastic region up to a yield point, a nonlinear elastoplastic region up to an initial peak or "critical stress," followed by a strain softening region up to a local minimum and finally, a strain hardening region up to ultimate failure. A general three-dimensional elasto-viscoplastic model was developed incorporating strain rate effects, and including the large deformation region. The model was formulated in strain space unlike most models in the literature. The stress-strain curves obtained were used to develop and validate the new elasto-viscoplastic constitutive model.
KW - Constituive modeling
KW - Dynamic testing
KW - Elasto-plastic behavior
KW - Multi-axial testing
KW - Polymer characterization
KW - Strain rate effects
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U2 - 10.1007/978-1-4614-4238-7_10
DO - 10.1007/978-1-4614-4238-7_10
M3 - Conference contribution
AN - SCOPUS:84869761076
SN - 9781461442370
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 73
EP - 84
BT - Dynamic Behavior of Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics
T2 - 2012 Annual Conference on Experimental and Applied Mechanics
Y2 - 11 June 2012 through 14 June 2012
ER -