Buckly-grains: a model system for elucidating interplay of extreme deformations and reconfigurations

Buckly-grains：用于阐明极端变形和重构相互作用的模型系统

• 批准号: 22KF0084
• 负责人: 竹内 一将
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22KF0084/
• 关键词: disordered materials; granular media; porous media; elasticity; experimental work; image analysis

The AY2022 was devoted to the implementation of the experimental set-up and development of the analysis tools.Experimental achievements (~6 months). Fabrication of the compressible ring-shaped grains using 3D-printing and moulding. Careful selection and testing of the ring material was necessary to avoid introducing undesirable plastic of viscoelastic deformations. Adaptation and improvement of the shear experimental set-up to acquire the global shear and compression force. Implementation of a Labview process to simultaneously control and synchronize the driving motor, the camera, and the force sensors. Acquisition of datasets varying both the shear amplitude and density of rings.Analysis achievements (~5 months). Development of an image analysis framework. The method detects and separates each ring and measures their tracked position, shape, and neighbourhood. We combine Lagrangian and Eulerian analysis. From these measurements, we explore the interplay between ring deformations and irreversible displacements. Rationalization of the mechanical response of a single ring to indentation by combining a finite element approach using COMSOL and a 1D analytical development.Presentations and publications (~1 month). Presentation of the preliminary results in domestic and international conferences, receiving positive and valuable feedbacks from the community. Outreach conferences to High school students (Science Dialogue) and French researchers. Publication (2) and submission (1) of research projects started before the JSPS fellowship.

AY2022致力于实施分析工具的实验设置和开发。实验成就（约6个月）。使用3D打印和成型制造可压缩的环形晶粒。必须仔细选择和测试环材料，以避免引入粘弹性变形的不良塑料。适应和改进剪切实验设置以获取全局剪切力和压缩力。实现LabView过程，以同时控制和同步驾驶电机，相机和力传感器。 收集数据集的剪切幅度和环的密度都不同。分析成就（〜5个月）。图像分析框架的开发。该方法检测并分离每个环，并测量其追踪位置，形状和邻域。我们结合了拉格朗日和欧拉分析。从这些测量值中，我们探索了环形变形和不可逆位移之间的相互作用。通过使用COMSOL和1D分析开发组合有限元方法的机械响应对压痕的机械响应的合理化（〜1个月）。在国内和国际会议上的初步结果的介绍，从社区获得积极而有价值的反馈。向高中生（科学对话）和法国研究人员举行宣传会议。研究项目的出版（2）和提交（1）开始在JSP奖学金之前。

项目成果

Reponse mecanique d’assemblages de structures elancees

响应机械装置结构装配

• 发表时间: 2023
• 作者: Poincloux Samuel;Vallat Celestin;Chen Tian;Sano Tomohiko G.;Reis Pedro M.;S. Poincloux
• 通讯作者: S. Poincloux

Indentation and stability of woven domes

• DOI: 10.1016/j.eml.2023.101968
• 发表时间: 2023-01
• 期刊: Extreme Mechanics Letters
• 影响因子: 4.7
• 作者: Samuel Poincloux;Célestin Vallat;Tian Chen;T. Sano;P. Reis

Sponge-like granular media

海绵状颗粒介质

• 发表时间: 2022
• 作者: S. Poincloux;K. A. Takeuchi
• 通讯作者: K. A. Takeuchi

Assessing seismic-like events prediction in model knits with unsupervised machine learning

通过无监督机器学习评估模型中的类地震事件预测

• DOI: 10.1016/j.eml.2022.101932
• 发表时间: 2023
• 期刊: Extreme Mechanics Letters
• 影响因子: 4.7
• 作者: Douin Adele;Poincloux Samuel;Bruneton Jean-Philippe;Lechenault Frederic
• 通讯作者: Lechenault Frederic

Mechanics of an assembly of highly compressible grains

高可压缩颗粒集合体的力学

• 发表时间: 2022
• 作者: S. Poincloux;K. A. Takeuchi
• 通讯作者: K. A. Takeuchi