Anisotropy evolution of elastomeric foams during uniaxial compression measured via in-situ X-ray computed tomography

Bolintineanu, Dan S.; Waymel, Robert; Collis, Henry; Long, Kevin N.; Quintana, Enrico C.; Kramer, Sharlotte L.B.

doi:10.1016/j.mtla.2021.101112

Anisotropy evolution of elastomeric foams during uniaxial compression measured via in-situ X-ray computed tomography

Journal Article · Sun Aug 01 00:00:00 EDT 2021 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2021.101112· OSTI ID:1784958

Bolintineanu, Dan S. ^[1]; ^[1]; ^[1]; ^[1]; Quintana, Enrico C. ^[1]; ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We have characterized the three-dimensional evolution of microstructural anisotropy of a family of elastomeric foams during uniaxial compression via in-situ X-ray computed tomography. Flexible polyurethane foam specimens with densities of 136, 160 and 240 kg/m³ were compressed in uniaxial stress tests both parallel and perpendicular to the foam rise direction, to engineering strains exceeding 70%. The uncompressed microstructures show slightly elongated ellipsoidal pores, with elongation aligned parallel to the foam rise direction. The evolution of this microstructural anisotropy during deformation is quantified based on the autocorrelation of the image intensity, and verified via the mean intercept length as well as the shape of individual pores. Trends are consistent across all three methods. In the rise direction, the material remains transversely anisotropic throughout compression. Anisotropy initially decreases with compression, reaches a minimum, then increases up to large strains, followed by a small decrease in anisotropy at the largest strains as pores collapse. Compression perpendicular to the foam rise direction induces secondary anisotropy with respect to the compression axis, in addition to primary anisotropy associated with the foam rise direction. In contrast to compression in the rise direction, primary anisotropy initially increases with compression, and shows a slight decrease at large strains. These surprising non-monotonic trends and qualitative differences in rise and transverse loading are explained based on the compression of initially ellipsoidal pores. Microstructural anisotropy trends reflect macroscopic stress-strain and lateral strain response. These findings provide novel quantitative connections between three-dimensional microstructure and anisotropy in moderate density polymer foams up to large deformation, with important implications for understanding complex three-dimensional states of deformation.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1784958

Alternate ID(s):: OSTI ID: 1797993

Report Number(s):: SAND--2020-6585J; 686968

Journal Information:: Materialia, Journal Name: Materialia Vol. 18; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Elastomeric foam
Foam microstructural anisotropy
X-ray computed tomography

Anisotropy evolution of elastomeric foams during uniaxial compression measured via in-situ X-ray computed tomography

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