Nanoindentation of glass wool fibers

Nadja Lonnroth, Christopher L. Muhlstein, Carlo Pantano, Yuanzheng Yue

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


The nanoindentation technique is used to analyze the depth dependence of the hardness and the reduced elastic modulus of bulk glasses and glass wool fibers (4-12 μm in diameter) of calcium aluminosilicate composition. In spite of the fiber geometry and the delicate sample mounting-technique, nanoindentation proves to be a relatively accurate method that provides reproducible data for both hardness (H) and reduced elastic modulus (Er) of thin glass fibers. It is found that H and Er are generally lower for the fiber than for the bulk sample. Within a given fiber, both H and Er are approximately constant with increasing indentation depth. However, both of these parameters decrease with diminishing fiber diameter. This trend is attributed to an increase of the free volume of the fibers with decreasing fiber diameter, i.e. to an increase of the fictive temperature.

Original languageEnglish (US)
Pages (from-to)3887-3895
Number of pages9
JournalJournal of Non-Crystalline Solids
Issue number32
StatePublished - Aug 15 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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