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Title: The deformation and failure response of closed-cell PMDI foams subjected to dynamic impact loading

The present work aims to investigate the bulk deformation and failure response of closed-cell Polymeric Methylene Diphenyl Diisocyanate (PMDI) foams subjected to dynamic impact loading. First, foam specimens of different initial densities are examined and characterized in quasi-static loading conditions, where the deformation behavior of the samples is quantified in terms of the compressive elastic modulus and effective plastic Poisson's ratio. Then, the deformation response of the foam specimens subjected to direct impact loading is examined by taking into account the effects of material compressibility and inertia stresses developed during deformation, using high speed imaging in conjunction with 3D digital image correlation. The stress-strain response and the energy absorption as a function of strain rate and initial density are presented and the bulk failure mechanisms are discussed. As a result, it is observed that the initial density of the foam and the applied strain rates have a substantial influence on the strength, bulk failure mechanism and the energy dissipation characteristics of the foam specimens.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
OSTI Identifier:
1235336
Report Number(s):
SAND--2015-0445J
Journal ID: ISSN 0142-9418; 562342
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Polymer Testing
Additional Journal Information:
Journal Volume: 44; Journal Issue: C; Journal ID: ISSN 0142-9418
Publisher:
Elsevier
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE polymeric foam; PMDI; dynamic loading; digital image correlation; shock tube