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High Strength, Porous, Brittle Materials

Published online by Cambridge University Press:  21 February 2011

J. S. Haggerty,
A. Lighfoot,
J. E. Ritter and
S. V. Nair
J. S. Haggerty
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
A. Lighfoot
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
J. E. Ritter
Affiliation:
University of Massachusetts, Amherst, MA 01003
S. V. Nair
Affiliation:
University of Massachusetts, Amherst, MA 01003
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Abstract

Contrary to existing models, strengths need not be a strong function of porosity for intermediate density, brittle materials. Flaw sizes can remain small (<50μm) if the void space is distributed uniformly in minimum dimension pores. For RBSN, fracture toughness decreases linearly with porosity for 0< porosity <40%. Strains to failure and specific strengths of these materials are higher than fully dense counterparts.

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