Elastic instabilities in dry, mesoporous minerals and their relevance to geological applications

Autor(en)

Ekhard K H Salje, Johannes Koppensteiner, Wilfried Schranz, Emmanuel Fritsch

Abstrakt

The collapse of minerals and mineral assemblies under external stress is modelled using a master curve where the stress failure is related to the relative, effective elastic moduli which are in turn related to the porosity of the sample. While a universal description is known not to be possible, we argue that for most porous materials such as shales, silica, cement phases, hydroxyapatite, zircon and also carbonates in corals and agglomerates we can estimate the critical porosity phi(c) at which small stresses will lead to the collapse of the sample. For several samples we Find phi(c) similar to 0.5 with an almost linear decay of the bulk moduli with porosity at phi(c) 2, between phi = 0.5 and phi = 1.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

University of Cambridge, Université Paris VII - Paris-Diderot

Journal

Mineralogical Magazine

Band

74

Seiten

341-350

Anzahl der Seiten

10

ISSN

0026-461X

DOI

https://doi.org/10.1180/minmag.2010.074.2.341

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a1ca0aea-f9da-43ce-98ba-fd523abdb2a5