Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.msec.2013.03.051
Title: Mechanical properties and structure of silkworm cocoons: A comparative study of Bombyx mori, Antheraea assamensis, Antheraea pernyi and Antheraea mylitta silkworm cocoons
Authors: Zhang, J.
Kaur, J.
Rajkhowa, R.
Li, J.L.
Liu, X.Y. 
Wang, X.G.
Keywords: Biological materials
Calcium oxalate crystal
Fracture toughness
Mechanical properties
Silkworm cocoon
Issue Date: 1-Aug-2013
Citation: Zhang, J., Kaur, J., Rajkhowa, R., Li, J.L., Liu, X.Y., Wang, X.G. (2013-08-01). Mechanical properties and structure of silkworm cocoons: A comparative study of Bombyx mori, Antheraea assamensis, Antheraea pernyi and Antheraea mylitta silkworm cocoons. Materials Science and Engineering C 33 (6) : 3206-3213. ScholarBank@NUS Repository. https://doi.org/10.1016/j.msec.2013.03.051
Abstract: As a protective shell against environmental damage and attack by natural predators, the silkworm cocoon has outstanding mechanical properties. In particular, this multilayer non-woven composite structure can be exceptionally tough to enhance the chance of survival for silkworms while supporting their metabolic activity. Peel, out-of-plane compression and nano-indentation tests and micro-structure analysis were performed on four types of silkworm cocoon walls (domesticated Bombyx mori, semi-domesticated Antheraea assamensis and wild Antheraea pernyi and Antheraea mylitta silkworm cocoons) to understand the structure and mechanical property relationships. The wild silkworm cocoons were shown to be uniquely tough composite structures. The maximum work-of-fracture for the wild cocoons (A. pernyi and A. mylitta) was approximately 1000 J/m 2, which was almost 10 times the value for the domesticated cocoon (Bombyx mori) and 3 ~ 4 times the value for the semi-domesticated cocoon (A. assamensis). Calcium oxalate crystals were found to deposit on the outer surfaces of the semi-domesticated and wild cocoons. They did not show influence in enhancing the interlaminar adhesion between cocoon layers but exhibited much higher hardness than the cocoon pelades. © 2013 Elsevier B.V.
Source Title: Materials Science and Engineering C
URI: http://scholarbank.nus.edu.sg/handle/10635/97164
ISSN: 09284931
DOI: 10.1016/j.msec.2013.03.051
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