Measurement system of shear banding formation of granular materials based on the particle image velocimetry(PIV) with the image processing device and the meshless analysis system for bifurcation behavior of the specimen

基于图像处理装置的颗粒图像测速（PIV）颗粒材料剪切带形成测量系统和试件分叉行为无网格分析系统

• 批准号: 14360144
• 负责人: MURAKAMI Akira
• 金额: $ 7.17万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14360144/
• 关键词: Shear band; PIV; Plane strain compression; Meshless method; Toyoura sand; Image processing; Finite strain; Localization

During a period of research project, an experimental device and the measurement system of localized deformation within saturated sand specimen during shear are constructed based on the particle image velocimetry(PIV) and the image processing device. Lateral image of the plane strain compression experiment under undrained condition using saturated Toyoura sand specimen is recorded by the high-speed video and the planar soil deformation is analyzed through the movement of a fine mesh of soil test patches on the image texture. These measurements are converted to the strain and the vortex distribution appeared in the lateral plane of specimen during the shear. After reviewing the underlying strategy of the PIV, a special focus is placed on the evolution of localized strain and vortex pattern. The mesh-free analysis program for solving soil-water coupled problem is also developed within the framework of finite strain to capture the localized profile of deformation of the specimen.

在一个研究项目中，基于粒子图像测速（PIV）和图像处理装置，搭建了饱和砂试件剪切过程中局部变形的实验装置和测量系统。通过高速视频记录不排水条件下使用饱和丰浦砂样进行平面应变压缩实验的横向图像，并通过图像纹理上土体试验斑块细网格的移动来分析平面土体变形。这些测量结果被转换为应变和剪切过程中样品横向平面中出现的涡流分布。在回顾了 PIV 的基本策略后，我们特别关注局部应变和涡流模式的演变。还在有限应变框架内开发了用于解决土水耦合问题的无网格分析程序，以捕获样本变形的局部轮廓。

项目成果

阪口 秀: "Initial packing in discrete element modeling"Discrete Element Methods. 117. 104-106 (2002)

Hide Sakaguchi：“离散元建模中的初始填充”离散元方法 117. 104-106 (2002)。

村上 章: "Localized behavior of saturated soil via element-free strategy"Proc.12th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering. 1. 925-928 (2003)

Akira Murakami：“通过无元素策略实现饱和土壤的局部化行为”Proc.12th 亚洲地区土壤力学和岩土工程会议 1. 925-928 (2003)。

村上 章: "新学会会館における電子会議・講習会遠隔地配信および電子図書室"土と基礎. 52(2). 37-40 (2004)

Akira Murakami：“在新学术大楼远程提供电子会议和培训课程以及电子图书馆”，Soil and Foundation 52(2) (2004)。

村上 章: "Localized deformation and stability of soft foundation under embankment construction via mesh free method"Proc.13th European Regional Conference on Soil Mechanics and Geotechnical Engineering. 2. 305-310 (2003)

Akira Murakami：“通过无网格法路堤施工下软地基的局部变形和稳定性”Proc.13th 欧洲土壤力学和岩土工程区域会议 2. 305-310 (2003)。

野中資博: "農業水利施設の設計施工とその性能照査における基本的論点"農業土木学会誌. 72(3). 7-11 (2004)

Motohiro Nonaka：“农业灌溉设施设计和施工的基本问题及其性能验证”，日本农业土木工程师学会杂志 72(3) (2004)。