Journal
MECHANICS OF MATERIALS
Volume 156, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mechmat.2021.103784
Keywords
Supramolecule; Slide-ring gel; Sliding dynamics; Crack propagation
Categories
Funding
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- JSPS KAKENHI [20K05627, JP18J13038]
- JST CREST [JPMJCR1992]
- JST-Mirai Program [JPMJMI18A2]
- Grants-in-Aid for Scientific Research [20K05627] Funding Source: KAKEN
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In the study on slide-ring gels, it was found that the fracture toughness decreases significantly when crack velocities exceed a critical value, as the sliding motion of the rings cannot keep up with the high deformation rates. From the critical transition velocity, the characteristic time scale of sliding dynamics was estimated to be on the order of microseconds under the assumption of single-layer fracture.
We investigate the fracture toughness of slide-ring (SR) gels, in which polymer chains are cross-linked by ring molecules, at various strain rates to evaluate the sliding speed of the cross-linking points. SR gels show a drastic decrease of the fracture energy at crack velocities higher than a critical value, since the sliding motion of the rings cannot catch up with the high deformation rates. From the critical transition velocity, we estimated the characteristic time scale of the sliding dynamics to be micro-seconds under the single-layer fracture assumption.
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