|
サイトウ クニヤス
Kuniyasu Saitoh
齊藤 国靖 所属 京都産業大学 理学部 物理科学科 職種 教授 |
|
| 発行・発表の年月 | 2018/09 |
| 形態種別 | 機関テクニカルレポート，技術報告書，プレプリント等 |
| 標題 | Transition rates for slip-avalanches in soft athermal disks under quasi-static simple shear deformations |
| 執筆形態 | その他 |
| 著者・共著者 | Kuniyasu Saitoh,Norihiro Oyama,Fumiko Ogushi,Stefan Luding |
| 概要 | We study slip-avalanches in two-dimensional soft athermal disks by<br />
quasi-static simulations of simple shear deformations. Sharp drops in shear<br /> stress, or slip-avalanches, are observed intermittently during steady state.<br /> Such the stress drop is caused by restructuring of the contact networks,<br /> accompanied by drastic changes of the interaction forces. The changes of the<br /> forces happen heterogeneously in space, indicating that collective non-affine<br /> motions of the disks are most pronounced when slip-avalanches occur. We analyze<br /> and predict statistics for the force changes, by transition rates of the force<br /> and contact angle, where slip-avalanches are characterized by their wide<br /> power-law tails. We find that the transition rates are described as a<br /> q-Gaussian distribution regardless of the area fraction of the disks. Because<br /> the transition rates quantify structural changes of the force-chains, our<br /> findings are an important step towards a microscopic theory of slip-avalanches<br /> in the experimentally accessible quasi-static regime. |
| PermalinkURL | http://arxiv.org/abs/1809.10487v1 |