Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading

Daniel, I. M.; Fenner, J. S.; Werner, B. T.; Cho, J-M.

doi:10.1007/978-3-319-42028-8_15

Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading

Journal Article · Sat Sep 17 00:00:00 EDT 2016 · Conference Proceedings of the Society for Experimental Mechanics Series

DOI:https://doi.org/10.1007/978-3-319-42028-8_15· OSTI ID:1504728

Daniel, I. M. ^[1]; Fenner, J. S. ^[2]; Werner, B. T. ^[3]; Cho, J-M. ^[4]

Northwestern Univ., Evanston, IL (United States); Northwestern University
Northwestern Univ., Evanston, IL (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Hyundai Motor Co., Seoul (South Korea)

A polymeric foam commonly used in composite sandwich structures was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic. Additionally, tests were conducted under uniaxial compression, tension, pure shear and combinations of normal and shear stresses. 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 made of polycarbonate bars having an impedance compatible to that of the foam material. The typical compressive stress-strain behavior of the polymeric foam exhibits a linear elastic region up to a yield point, a nonlinear elastic-plastic region up to an initial peak or “critical stress” corresponding to collapse initiation of the cells, followed by strain softening up to a local minimum (plateau or saddle point stress) and finally, a strain hardening region up to densification of the foam. The characteristic stresses of the stress-strain behavior vary linearly with the logarithm of strain rate. A general three-dimensional elastic-viscoplastic model, formulated in strain space, was proposed. The model expresses the multi-axial state of stress in terms of an effective stress, incorporates strain rate effects and includes the large deformation region. Stress-strain curves obtained under multi-axial loading at different strain rates were used to develop and validate the elastic-viscoplastic constitutive model. Lastly, excellent agreement was shown between model predictions and experimental results.

View Accepted Manuscript (DOE)

Research Organization:: Ford Motor Company, Dearborn, MI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: EE0006867

OSTI ID:: 1504728

Journal Information:: Conference Proceedings of the Society for Experimental Mechanics Series, Journal Name: Conference Proceedings of the Society for Experimental Mechanics Series Vol. 4; ISSN 2191-5652

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
Constitutive modeling
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Strain rate dependence

Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading

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