Unique stick-slip crack dynamics of double- network hydrogels under pure- shear loading

• 成果类型: Article
• 署名作者: Zheng, Yong; Wang, Yiru; Tian, Fucheng; Nakajima, Tasuku; Hui, Chung-Yuen; Gong, Jian Ping
• 署名单位: Hokkaido University; Hokkaido University; Hokkaido University; Cornell University; Hokkaido University; Zhejiang University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9997
• DOI: 10.1073/pnas.2322437121
• 发表日期: 2024-07-23
• 关键词: fracture-toughness; fatigue; rupture; rubber; FORCE

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).