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Comparison of elastic properties of low-density polymeric foams determined by ultrasonic wave propagation and quasi-static mechanical testing

journal contribution
posted on 06.01.2020 by Joseph Holt, Sabrina Blackwell, Lorenzo Zani, Carmen Torres
The ability to predict the mechanical performance of materials without sample extraction is of great interest to manufacturers and end-users. The aim of this work was to examine the relationship between the quasi-static measurements (i.e. the typically reported elastic property) and the non-destructive in-line in-situ ultrasonic wave propagation-derived elastic moduli of porous polyurethane foams over a range of densities. It was found that the ratio of moduli was direction-dependent: a factor of 2 when the testing was perpendicular to the pore orientation and a factor of 1.7 when parallel to the pore rising direction. The deviation was explained by ruling mechanisms such as strain rate and amplitude, deviation from orthotropic theory and anisotropy, and degree of density which affected shear wave propagation. The correlations were in agreement with those reported for other porous materials. The quantification of this correlation is a practical tool for estimating elastic properties on heterogeneous, irregularly shaped samples not suitable for bulk testing, or for in-line rapid quality control of parts in production lines.

Funding

Innovate UK (grant no. 133628)

EPSRC (grant no. EP/P027482/1)

EPSRC (grant no. EP/L014998/1)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials Letters

Volume

263

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Materials Letters and the definitive published version is available at https://doi.org/10.1016/j.matlet.2019.127243

Acceptance date

22/12/2019

Publication date

2019-12-23

Copyright date

2020

ISSN

0167-577X

Language

en

Depositor

Dr Carmen Torres-Sanchez Deposit date: 23 December 2019

Article number

127243

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