Mechanical testing of spider silk at cryogenic temperatures

Pogozelski, Edward; Becker, William L.; See, Brendan D.; Kieffer, C. M.

doi:10.1016/j.ijbiomac.2010.09.005

Cited by 8 publications

(6 citation statements)

References 8 publications

(13 reference statements)

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“…As demonstrated in other studies 34 , 43 , 45 , 46 , natural silks especially spider dragline silks display enhanced tensile elastic modulus and strength without compromise to the elongation at low temperatures such as −60 °C. Nevertheless, the underline mechanism for low temperature extensibility remains poorly understood.…”

Section: Discussionsupporting

confidence: 53%

“…Reported values of the toughness, or breaking energy, of silks, measured in uniaxial tensile stress-strain tests, range from 60 to 80 MJ.m −3 depending on the different fibre types and other factors such as degree of hydration 30 – 33 . In particular, spider dragline silks have been found to display enhanced modulus and strength and thus enhanced toughness, at cryogenic temperatures, specifically with a breaking energy of 214 MJ.m −3 under ambient conditions 34 , 35 . Moreover, spider silks and silkworm silks have both been found in bullet-impact experiments to generate significant elastic and plastic deformation at high strain rates to create good impact toughness 36 , 37 .…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Mechanical Toughness of Epoxy-Resin Composites Using Natural Silk Reinforcements

Yang

Guan

et al. 2017

Sci Rep

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Strong and tough epoxy composites are developed using a less-studied fibre reinforcement, that of natural silk. Two common but structurally distinct silks from the domestic B. mori/Bm and the wild A. pernyi/Ap silkworms are selected in fabric forms. We show that the toughening effects on silk-epoxy composites or SFRPs are dependent on the silk species and the volume fraction of silk. Both silks enhance the room-temperature tensile and flexural mechanical properties of the composite, whereas the more resilient Ap silk shows a more pronounced toughening effect and a lower critical reinforcement volume for the brittle-ductile transition. Specifically, our 60 vol.% Ap-SFRP displays a three-fold elevation in tensile and flexural strength, as compared to pure epoxy resin, with an order of magnitude higher breaking energy via a distinct, ductile failure mode. Importantly, the 60 vol.% Ap-SFRP remains ductile with 7% flexural elongation at lower temperatures (−50 °C). Under impact, these SFRPs show significantly improved energy absorption, and the 60 vol.% Ap-SFRP has an impact strength some eight times that of pure epoxy resin. The findings demonstrate both marked toughening and strengthening effects for epoxy composites from natural silk reinforcements, which presents opportunities for mechanically superior and “green” structural composites.

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Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical Toughness of Epoxy-Resin Composites Using Natural Silk Reinforcements

Yang

Guan

et al. 2017

Sci Rep

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“…S10 (ESI †), which is different from the design in ref. 44. An Instron 5565 was applied for the tensile test at a strain rate of 0.005 s À1 if not otherwise indicated.…”

Section: Tensile Test With Instronmentioning

confidence: 99%

Cryogenic toughness of natural silk and a proposed structure–function relationship

Wang

Guan

et al. 2019

Mater. Chem. Front.

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“…MA silks submerged in liquid nitrogen display higher tensile strength after cryogenic treatment (64% increases), a temperature that at atmospheric pressure corresponds to À196°C (Pogozelski et al, 2011). MA silks submerged in liquid nitrogen display higher tensile strength after cryogenic treatment (64% increases), a temperature that at atmospheric pressure corresponds to À196°C (Pogozelski et al, 2011).…”

Section: Physical Properties Of Ma Silkmentioning

confidence: 99%