Characterization and modeling of polymeric foam under multi-axial static and dynamic loading

Isaac M Daniel*, J. S. Fenner, B. T. Werner, J. M. Cho

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A polymeric foam commonly used in composite sandwich structures was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic. 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 servohydraulic 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 stressstrain 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 threedimensional 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. Stressstrain curves obtained under multi-axial loading at different strain rates were used to develop and validate the elasticviscoplastic constitutive model. Excellent agreement was shown between model predictions and experimental results.

Original languageEnglish (US)
Title of host publicationExperimental and Applied Mechanics - Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
EditorsYong Zhu, Alan T. Zehnder
PublisherSpringer New York LLC
Pages123-134
Number of pages12
ISBN (Print)9783319420271
DOIs
StatePublished - Jan 1 2017
EventAnnual Conference and Exposition on Experimental and Applied Mechanics, 2016 - Orlando, United States
Duration: Jun 6 2016Jun 9 2016

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume4
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Other

OtherAnnual Conference and Exposition on Experimental and Applied Mechanics, 2016
CountryUnited States
CityOrlando
Period6/6/166/9/16

Keywords

  • Constitutive modeling
  • Dynamic testing
  • Polymeric foams
  • Strain rate dependence

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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