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

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-axialmore » 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.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Hyundai Motor Co., Seoul (South Korea)
Publication Date:
Grant/Contract Number:
EE0006867
Type:
Accepted Manuscript
Journal Name:
Experimental and Applied Mechanics
Additional Journal Information:
Journal Volume: 4; Conference: Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
Research Org:
Ford Motor Company, Dearborn, MI (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Polymeric foams; Dynamic testing; Strain rate dependence; Constitutive modeling
OSTI Identifier:
1504728

Daniel, I. M., Fenner, J. S., Werner, B. T., and Cho, J-M.. Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading. United States: N. p., Web. doi:10.1007/978-3-319-42028-8_15.
Daniel, I. M., Fenner, J. S., Werner, B. T., & Cho, J-M.. Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading. United States. doi:10.1007/978-3-319-42028-8_15.
Daniel, I. M., Fenner, J. S., Werner, B. T., and Cho, J-M.. 2016. "Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading". United States. doi:10.1007/978-3-319-42028-8_15. https://www.osti.gov/servlets/purl/1504728.
@article{osti_1504728,
title = {Characterization and Modeling of Polymeric Foam Under Multi-Axial Static and Dynamic Loading},
author = {Daniel, I. M. and Fenner, J. S. and Werner, B. T. and Cho, J-M.},
abstractNote = {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.},
doi = {10.1007/978-3-319-42028-8_15},
journal = {Experimental and Applied Mechanics},
number = ,
volume = 4,
place = {United States},
year = {2016},
month = {9}
}