Structural effect on the plastic behavior in highly porous glasses

T. Woignier, A. Hafidi Alaoui, J. Primera, J. Phalippou, George Scherer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Silica aerogels have been studied with the objective of understanding the mechanical behavior of these extremely porous (pore volume higher than 85%) glassy materials. Elastic and plastic behaviors are investigated using Hg porosimetry. Because of the peculiar structure of these materials, Hg liquid cannot enter their porous network and consequently induces an isostatic pressure. Due to the high compliance of the solid network, under isostatic pressure aerogels display an irreversible shrinkage caused by plastic deformation. The magnitude of the plastic shrinkage and the increase of the associated mechanical properties depend on the different parameters (porosity, elastic properties and structural features). The structural features are followed by X Rays scattering. The irreversible compaction can be explained by siloxane bond formation between clusters constituting the porous materials, retaining the strained structure. The pore collapse mechanism is favored by the large pores structure and loose cluster structure (low fractal dimension). This densification process could offer a new way to synthesize porous glasses at room temperature.

Original languageEnglish (US)
Title of host publicationMechanical Properties of Solids XI
Pages15-24
Number of pages10
DOIs
StatePublished - Feb 5 2010
Event11th Congress on Mechanical Properties of Solids 2008 - Cadiz, Spain
Duration: Sep 9 2008Sep 12 2008

Publication series

NameKey Engineering Materials
Volume423
ISSN (Print)1013-9826

Other

Other11th Congress on Mechanical Properties of Solids 2008
CountrySpain
CityCadiz
Period9/9/089/12/08

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Woignier, T., Hafidi Alaoui, A., Primera, J., Phalippou, J., & Scherer, G. (2010). Structural effect on the plastic behavior in highly porous glasses. In Mechanical Properties of Solids XI (pp. 15-24). (Key Engineering Materials; Vol. 423). https://doi.org/10.4028/www.scientific.net/KEM.423.15