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Table 3.

Mechanical properties of major ampullate silk fibers

SpeciesSingle fiber diameter (μm)Young's modulus (GPa)Stress at yield (MPa)Strain at yieldExtensibilityUltimate strength (MPa)Toughness (J m−3)
Deinopis spinosa (N=4, n=42) 0.50±0.16 13.6±0.9 273.7±31.5 0.024±0.004 0.22±0.02 1264±163 138±7 
Hyptiotes cavatus (N=2, n=13) 0.92±0.01 10.7±0.5 215.5±8.1 0.022±0.001 0.20±0.01 1837±3 164±1 
Uloborus diversus (N=6, n=39) 0.59±0.06 7.8±1.6 145±33 0.017±0.004 0.22±0.02 1418±222 158±27 
SpeciesSingle fiber diameter (μm)Young's modulus (GPa)Stress at yield (MPa)Strain at yieldExtensibilityUltimate strength (MPa)Toughness (J m−3)
Deinopis spinosa (N=4, n=42) 0.50±0.16 13.6±0.9 273.7±31.5 0.024±0.004 0.22±0.02 1264±163 138±7 
Hyptiotes cavatus (N=2, n=13) 0.92±0.01 10.7±0.5 215.5±8.1 0.022±0.001 0.20±0.01 1837±3 164±1 
Uloborus diversus (N=6, n=39) 0.59±0.06 7.8±1.6 145±33 0.017±0.004 0.22±0.02 1418±222 158±27 

For this study, s.e.m. was calculated using individual spiders (N)as the sampling unit rather than the total number of fibers tested(n).

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