Biomedical Engineering Reference
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Figure 9-3.
Anisotropic mechanical properties of spider silk fibers measured in
longitudinal and transverse sections using both dynamic stiffness imaging and quasi-
static indentation. Both methods revealed mechanical anisotropy (reduced modulus
values shown are from quasi-static testing), and the stiffness imaging also revealed
structural anisotropy. Bars = 2 micrometers. (Data adapted from spider silk study by
Ebenstein
et al.
9
)
measurement of the mechanical properties of the veins of the cicada
forewing,
46
and investigation of correlations between hardness and local
chemical composition in polychaete jaws.
47
Because of the small
dimensions of many of these materials, and the desire to map mechanical
properties or study gradients in mechanical and chemical properties,
nanoindentation was selected as the ideal mechanical characterization
techniques for each of these studies. By coupling this mechanical data
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