自愈水凝胶
打滑(空气动力学)
剪切(地质)
材料科学
复合材料
动力学(音乐)
结构工程
机械
工程类
物理
高分子化学
热力学
声学
作者
Yong Zheng,Yiru Wang,Fucheng Tian,Tasuku Nakajima,Chung‐Yuen Hui,Jian Ping Gong
标识
DOI:10.1073/pnas.2322437121
摘要
In this work, we have found that a prenotched double-network (DN) hydrogel, when subjected to tensile loading in a pure-shear geometry, exhibits intriguing stick-slip crack dynamics. These dynamics synchronize with the oscillation of the damage (yielding) zone at the crack tip. Through manipulation of the loading rate and the predamage level of the brittle network in DN gels, we have clarified that this phenomenon stems from the significant amount of energy dissipation required to form the damage zone at the crack tip, as well as a kinetic contrast between the rapid crack extension through the yielding zone (slip process) and the slow formation of a new yielding zone controlled by the external loading rate (stick process).
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