学术报告

　　张洁博士现任上海交通大学物理与天文学院和自然科学研究院教授，在中国科学技术大学获得学士学位，美国匹兹堡大学获物理博士学位。先后在美国杜克大学和美国洛斯阿拉莫斯国家实验室开展流体力学和颗粒物理学领域相关的博士后研究工作。研究领域包括玻璃化转变和阻塞转变、非晶态固体的塑性、颗粒材料的统计力学、玻璃态材料的流变行为、非晶态固体中声子传输及流体力学等。目前在包括Nature, PNAS, PRL, Nature Communications等在内的同行评审期刊发表论文60余篇。

　　Dense granular materials' mechanical yield is a captivating rheological phenomenon, where stress no longer increases significantly with strain beyond a point. Understanding the behavior of yielding is a fundamental goal in granular physics. We conducted experiments on bidisperse jammed disks to understand the yielding behavior. We found that the yielding transition is critical and satisfies the marginal mechanical stability condition. These findings contribute to understanding the complex nature of yielding in amorphous solids.