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Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests

Rajkhowa, Rangam, Kaur, Jasjeet, Wang, Xungai and Batchelor, Warren 2015, Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests, Journal of the royal society interface, vol. 12, no. 107, pp. 1-10, doi: 10.1098/rsif.2015.0177.

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Title Intrinsic tensile properties of cocoon silk fibres can be estimated by removing flaws through repeated tensile tests
Author(s) Rajkhowa, RangamORCID iD for Rajkhowa, Rangam orcid.org/0000-0002-6811-9126
Kaur, Jasjeet
Wang, Xungai
Batchelor, Warren
Journal name Journal of the royal society interface
Volume number 12
Issue number 107
Start page 1
End page 10
Total pages 10
Publisher The Royal Society Publishing
Place of publication London, Eng.
Publication date 2015-06
ISSN 1742-5689
1742-5662
Summary  ilk fibres from silkworm cocoons have lower strength than spider silk and have received less attention as a source of high-performance fibres. In this work, we have used an innovative procedure to eliminate the flaws gradually of a single fibre specimen by retesting the unbroken portion of the fibre, after each fracture test. This was done multiple times so that the final test may provide the intrinsic fibre strength. During each retest, the fibre specimen began to yield once the failure load of the preceding test was exceeded. For each fibre specimen, a composite curve was constructed from multiple tests. The composite curves and analysis show that strengths of mass-produced Muga and Eri cocoon silk fibres increased from 446 to 618 MPa and from 337 to 452 MPa, respectively. Similarly, their toughness increased from 84 to 136 MJ m(-3) and from 61 to 104 MJ m(-3), respectively. Composite plots produced significantly less inter-specimen variations compared to values from single tests. The fibres with reduced flaws as a result of retests in the tested section have a tensile strength and toughness comparable to naturally spun dragline spider silk with a reported strength of 574 MPa and toughness of 91-158 MJ m(-3), which is used as a benchmark for developing high-performance fibres. This retesting approach is likely to provide useful insights into discrete flaw distributions and intrinsic mechanical properties of other fatigue-resistant materials.
Language eng
DOI 10.1098/rsif.2015.0177
Field of Research 091012 Textile Technology
Socio Economic Objective 860403 Natural Fibres
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, The Royal Society Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30073424

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Mon, 25 May 2015, 15:18:22 EST

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