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Related Experiment Video

Updated: Jun 1, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

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Published on: April 25, 2019

Shear thickening inside elastic open-cell foams under dynamic compression.

Samantha M Livermore¹, Alice Pelosse¹, Michael van der Naald¹

¹James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA. slivermore@uchicago.edu.

|January 20, 2025

Summary

This study reveals how the pore size distribution of polyurethane foams influences the mechanical response of fumed silica suspensions. Foam structure dictates energy dissipation and stress, crucial for understanding complex fluid-material interactions.

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Published on: December 11, 2014

Area of Science:

Materials Science
Rheology
Polymer Science

Background:

Open-cell foams are versatile materials with applications in energy absorption and damping.
Understanding the behavior of non-Newtonian fluids within porous structures is critical for material design.
Fumed silica suspensions in polyethylene glycol exhibit shear-thickening behavior.

Purpose of the Study:

To investigate the compressive response of polyurethane foams filled with shear-thickening suspensions.
To determine the influence of foam pore size distribution on material behavior.
To elucidate the relationship between suspension rheology and foam mechanics.

Main Methods:

Compression testing of foam-suspension composites across a wide range of speeds.
Optical measurements of foam deformation and suspension flow.
Development of a simplified model incorporating viscous drag and foam elasticity.

Main Results:

Compressive stress increases gradually, indicating shear rate gradients within the suspension.
Dissipated energy scales with an effective internal shear rate, enabling data collapse for different foams.
Peak energy dissipation correlates with the shear-thickening onset of the bulk suspension.
Foam pore size distribution is identified as a critical parameter for modeling.

Conclusions:

The mechanical response of these composite materials is governed by the interplay between foam structure and suspension rheology.
Foam pore size distribution significantly impacts energy dissipation and stress response.
The findings provide a framework for designing foams with tailored properties for specific applications.