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Poisson’s ratio of eTPU molded bead foams in compression via in situ synchrotron X-ray microtomography

  • Polymers & biopolymers
  • Published:
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Abstract

In situ synchrotron X-ray microtomography was used to characterize the bulk deformation behavior by computing the Poisson’s ratio of expanded thermoplastic polyurethane (eTPU) molded bead foams used in footwear midsole during compression. Quantitative data on morphological characteristics were obtained using an iterative image processing workflow. Image correlation on the 4D datasets using DVC was performed to calculate the volumetric and axial strain to estimate the Poisson ratio. Strain maps from DVC showed the influence of variability in ligament thickness distribution on the global mechanical behavior exhibited which dominated the response seen in these bead foams. Finally, our results showed a strong correlation between Poisson ratio and distribution of ligament thickness in foams.

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Acknowledgements

The authors are grateful for financial support from adidas AG. We gratefully acknowledge the use of resources at Beamline 2-BM of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Funding

This study was funded by from adidas AG.

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Authors and Affiliations

  1. Center for 4D Materials Science, Arizona State University, Tempe, AZ, 85287-6106, USA

    Arun Sundar S. Singaravelu, Jason J. Williams & Nikhilesh Chawla

  2. Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA

    Pavel Shevchenko & Francesco De Carlo

  3. Future Team, Adidas AG, 91704, Herzogenaurach, Germany

    Jasmin Ruppert & Chris Holmes

  4. Future Team, Adidas AG, Portland, OR, 97217, USA

    Mark Henderson

  5. School of Materials Engineering, Neil Armstrong Hall of Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, IN, 47907-2045, USA

    Nikhilesh Chawla

Authors
  1. Arun Sundar S. Singaravelu
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  2. Jason J. Williams
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  4. Jasmin Ruppert
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Correspondence to Nikhilesh Chawla.

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Singaravelu, A.S.S., Williams, J.J., Shevchenko, P. et al. Poisson’s ratio of eTPU molded bead foams in compression via in situ synchrotron X-ray microtomography. J Mater Sci 56, 12920–12935 (2021). https://doi.org/10.1007/s10853-021-06103-w

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