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Model for instrumented indentation of brittle open-cell foam

Published online by Cambridge University Press:  23 July 2018

Robert F. Cook*
Affiliation:
Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
*
Address all correspondence to Robert F. Cook at robert.cook@nist.gov
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Abstract

A model is developed and implemented for load-controlled instrumented conical indentation of a brittle open-cell foam on a dense substrate. A survey of observations suggests that such indentations are typified by displacement excursions at small indentation loads, load-displacement variability, localized crushing, and a discrete to continuum transition at intermediate loads. The model includes all these effects as well as stiffening at large loads as the substrate is encountered. Direct quantitative comparison is made with measurements of a silica foam on a soda-lime glass substrate, strongly supporting the physical basis of the model.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2018 

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