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( 1月23日 10:00 )Numerical study of elasticity, plasticity, yielding and jamming in hard sphere glasses

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报告题目:

 Numerical study of elasticity, plasticity, yielding and jamming in hard sphere glasses

报告人:                         Yuliang Jin

 

中国科学院理论物理研究所

 

 

时间:2019123(周三)10:00        

地点:中国科学院力学研究所1号楼344会议室

报告摘要:

Amorphous solids, such as glasses, have complex responses to deformations, with substantial consequences in material design and applications. In this respect, two intertwined aspects are important: stability and reversibility. It is crucial to understand, on the one hand, how a glass may become unstable due to increased plasticity under shear deformations, and, on the other hand, to what extent the response is reversible, meaning how much a system is able to recover the original configuration once the perturbation is released. We study numerically an assembly of hard spheres, which is considered as the simplest model of amorphous solids such as colloidal glasses and granular matter. We prepare glass states quenched from equilibrium supercooled liquid states, which are obtained by using the swap Monte Carlo algorithm and correspond to a wide range of structural relaxation time scales. We exhaustively map out their stability and reversibility under volume and shear strains using extensive numerical simulations. The region on the volume-shear strain phase diagram where the original glass state remains solid is bounded by the shear yielding and the shear jamming lines that meet at a yielding-jamming crossover point. This solid phase can be further divided into two sub-phases: the stable glass phase, where the system deforms purely elastically and is totally reversible, and the marginal glass phase, where it experiences stochastic plastic deformations at mesoscopic scales and is partially irreversible. The separation of the stable and the marginally stable phases is a consequence of the so-called Gardner transition. In the marginally stable phase, the shear modulus of hard sphere glasses is protocol-dependent . The details of the stability-reversibility map depend strongly on the quality of annealing of the glass. This study provides a unified framework for understanding elasticity, plasticity, yielding, and jamming in amorphous solids.

 

报告人简介:

金瑜亮博士2006年本科毕业于复旦大学,并获得李政道先生的mini-CUSPEA(中美联合培养物理类研究生计划)奖学金支持赴美国留学。先后在美国、意大利、法国和日本有共计12年海外学习和研究的经历。2012年于美国纽约城市大学获得物理学博士学位。之后,在美国杜克大学、意大利罗马大学、法国高等师范学校进行博士后研究工作。2015年 至2018年,在日本大阪大学Cybermedia中心就职特任研究员。20184月起受聘为中国科学院理论物理研究所副研究员。主要研究领域为软凝聚态物理和非平衡态统计物理。近年来的主要研究课题包括非晶态物质中的玻璃相变、Gardner相变和jamming相变等。其研究成果在Science Advances, Nature Communications, PNAS等国际期刊上发表共20余篇。

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