权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

MEASUREMENT AND ANALYZING SYSTEM OF DEFORMATION AND STRESS IN SOIL-BIN TEST

土仓试验变形与应力测量分析系统

基本信息

批准号：
07456157
负责人：
HASHIGUCHI Koichi
金额：
$ 1.09万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07456157/
关键词：
SOIL-BIN STRAIN STRESS PICTURE ANALYSIS MEASUREMENT SYSTEM ON-LINE 車輪

项目摘要

It is of importance for the study of farm machinery to elucidate state of deformation and stress in soils. The practical use of the marker method in which soil deformation is measured by observing the movement of several hundreds of markers (about 5 mm diameter) attached inside the transparent wall of soil-bin is studied in this research project. The following results are obtained in the project.1. The wheel traveling test was done in the soil-bin, burying thin straight rods in positions corresponding to markers. After the test the displacements of markers and those of rods are compared with each other. It is concluded that the polyester-made marker in which a white square (1 mm in one side) in the center of black circle (5 mm diameter) is printed and has a tip on the behind would be suitable.2. The on-line measurement and display-expression of marker displacements was realized with a satisfactory precision by using the line-shift camera in which 4,800 photo-elements are arranged in a line and developing the software for analyzing the pictures.3. The automatic calculation program for strain increment and strain distribution was made, in which marker displacements are substituted into the compatibility equation for the triangle or square finite elements formed by the adjacent markers.4. The automatic calculation program for stress was developed by substituting the strain increments into the elastoplastic constitutive equation of soils which is proposed by the head investigator and called the subloading surface model.

研究土壤的变形和应力状态对农业机械的研究具有重要意义。本研究项目研究了通过观察附着在土槽透明壁内的数百个标记（直径约5 mm）的运动来测量土壤变形的标记方法的实际使用。本项目取得了以下成果：1.在土槽中进行车轮行走试验，在与标记对应的位置埋设细直杆。在测试之后，将标记的位移和棒的位移相互比较。结论是聚酯制造的记号笔，其中在黑色圆（直径5 mm）的中心印刷白色正方形（一边1 mm），并且在后面具有尖端是合适的。利用4,800个光敏元件排成一行的线位移相机，开发了图像分析软件，实现了标记位移的在线测量和显示，并获得了满意的精度.编制了应变增量和应变分布的自动计算程序，将相邻标志点形成的三角形或正方形有限元的标志点位移代入协调方程中.将应变增量代入土的弹塑性本构方程中，编制了应力自动计算程序，称之为次加载面模型。