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Influence of moisture on the mechanical behavior of a natural composite

Paper ID Volume ID Publish Year Pages File Format Full-Text
1423 83 2010 8 PDF Available
Title
Influence of moisture on the mechanical behavior of a natural composite
Abstract

The effects of moisture on the mechanical properties of the spicules of the sponge Euplectella aspergillum have been investigated. Determinations were made with the aid of a dynamic mechanical analyzer in both the static and dynamic modes, as well as imaging of the failed surfaces with scanning electron microscopy. For comparison purposes, melt-grown glass fibers of similar diameters were also studied in both distilled water and seawater. That exposure reduced both the stiffness and strength of the spicules. In addition, the energy required to achieve complete failure decreased in moist environments. The data for the wet spicules in both aqueous media showed decreasing values of energy dissipated until catastrophic failure compared to dry samples. The strength of wet glass decreased when compared with the dry condition, and the elastic modulus was also reduced. The most marked influence of moisture was seen in the damping effects in moist spicule samples that were nearly an order of magnitude larger than the damping of dry spicules. This effect was attributed mainly to plasticization of the thin organic layers.

Keywords
Moisture; Sponges; Damping; Energy dissipation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 6, June 2010, Pages 2181–2188
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Any Questions? feel free to contact us