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Artificial and natural silk materials have high mechanical property variability regardless of sample size

Greco, Gabriele and Mirbaha, Hamideh and Schmuck, Benjamin and Rising, Anna and Pugno, Nicola M. (2022). Artificial and natural silk materials have high mechanical property variability regardless of sample size. Scientific Reports. 12 , 3507
[Research article]

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Abstract

Silk fibres attract great interest in materials science for their biological and mechanical properties. Hitherto, the mechanical properties of the silk fibres have been explored mainly by tensile tests, which provide information on their strength, Young’s modulus, strain at break and toughness modulus. Several hypotheses have been based on these data, but the intrinsic and often overlooked variability of natural and artificial silk fibres makes it challenging to identify trends and correlations. In this work, we determined the mechanical properties of Bombyx mori cocoon and degummed silk, native spider silk, and artificial spider silk, and compared them with classical commercial carbon fibres using large sample sizes (from 10 to 100 fibres, in total 200 specimens per fibre type). The results confirm a substantial variability of the mechanical properties of silk fibres compared to commercial carbon fibres, as the relative standard deviation for strength and strain at break is 10–50%. Moreover, the variability does not decrease significantly when the number of tested fibres is increased, which was surprising considering the low variability frequently reported for silk fibres in the literature. Based on this, we prove that tensile testing of 10 fibres per type is representative of a silk fibre population. Finally, we show that the ideal shape of the stress–strain curve for spider silk, characterized by a pronounced exponential stiffening regime, occurs in only 25% of all tested spider silk fibres.

Authors/Creators:Greco, Gabriele and Mirbaha, Hamideh and Schmuck, Benjamin and Rising, Anna and Pugno, Nicola M.
Title:Artificial and natural silk materials have high mechanical property variability regardless of sample size
Series Name/Journal:Scientific Reports
Year of publishing :2022
Volume:12
Article number:3507
ISSN:2045-2322
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 209 Industrial Biotechnology > Bio Materials
Keywords:Biomaterials, Soft materials, Structural materials
URN:NBN:urn:nbn:se:slu:epsilon-p-117289
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117289
Additional ID:
Type of IDID
DOI10.1038/s41598-022-07212-5
ID Code:28127
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Anatomy, Physiology and Biochemistry
Deposited By: SLUpub Connector
Deposited On:31 May 2022 12:25
Metadata Last Modified:31 May 2022 12:31

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