Identification of two-dimensional and three- dimensional shear bands in granular media
碩士 === 國立臺灣大學 === 應用力學研究所 === 99 === Failure of granular materials under external forces is presented by localized strain bands. This localized strain failure is called “ shear bands“. In general, microscopic properties are discontinuous between the shear bands and their neighborhood. Therefore, bas...
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ndltd-TW-099NTU054990452015-10-16T04:03:08Z http://ndltd.ncl.edu.tw/handle/25355725916683709584 Identification of two-dimensional and three- dimensional shear bands in granular media 顆粒材料二維及三維剪切帶之識別 Yu-Jie Huang 黃昱傑 碩士 國立臺灣大學 應用力學研究所 99 Failure of granular materials under external forces is presented by localized strain bands. This localized strain failure is called “ shear bands“. In general, microscopic properties are discontinuous between the shear bands and their neighborhood. Therefore, based on the phenomenon of shear bands, we can determine the location, size, and direction. The Morphologies of shear bands and their evolution are also of interest. Although the macroscopic phenomena had been addressed in many exist literature, microscopic features were largely omitted. In this dissertation, we use the discrete element method (DEM) to simulate the process of granular materials forming shear bands. This simulation is divided into two part. First, We use PFC2D software to simulate a two-dimensional axial test that produces shear bands;Secondly, we use EDEM software to simulate a three- dimensional axial test. There are six microscopic quantities are defined for theoretical modeling. They are the porosity, spin angular velocity, number of contact particles, the bulk part of the gyration tensor , the rotation part of the gyration tensor and the local shear intensity. We investigate the shear bands with these six parameters and discuss the m- icroscopic properties in the 2D and 3D shear bands. Companion, classification and summarization of the granular material proportion using these parameters are performed. Kuo-Ching Chen 陳國慶 2011 學位論文 ; thesis 128 zh-TW |
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碩士 === 國立臺灣大學 === 應用力學研究所 === 99 === Failure of granular materials under external forces is presented by localized strain bands. This localized strain failure is called “ shear bands“. In general, microscopic properties are discontinuous between the shear bands and their neighborhood. Therefore, based on the phenomenon of shear bands, we can determine the location, size, and direction. The Morphologies of shear bands and their evolution are also of interest. Although the macroscopic phenomena had been addressed in many exist literature, microscopic features were largely omitted.
In this dissertation, we use the discrete element method (DEM) to simulate the process of granular materials forming shear bands. This simulation is divided into two part. First, We use PFC2D software to simulate a two-dimensional axial test that produces shear bands;Secondly, we use EDEM software to simulate a three- dimensional axial test.
There are six microscopic quantities are defined for theoretical modeling. They are the porosity, spin angular velocity, number of contact particles, the bulk part of the gyration tensor , the rotation part of the gyration tensor and the local shear intensity. We investigate the shear bands with these six parameters and discuss the m- icroscopic properties in the 2D and 3D shear bands. Companion, classification and summarization of the granular material proportion using these parameters are performed.
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author2 |
Kuo-Ching Chen |
author_facet |
Kuo-Ching Chen Yu-Jie Huang 黃昱傑 |
author |
Yu-Jie Huang 黃昱傑 |
spellingShingle |
Yu-Jie Huang 黃昱傑 Identification of two-dimensional and three- dimensional shear bands in granular media |
author_sort |
Yu-Jie Huang |
title |
Identification of two-dimensional and three- dimensional shear bands in granular media |
title_short |
Identification of two-dimensional and three- dimensional shear bands in granular media |
title_full |
Identification of two-dimensional and three- dimensional shear bands in granular media |
title_fullStr |
Identification of two-dimensional and three- dimensional shear bands in granular media |
title_full_unstemmed |
Identification of two-dimensional and three- dimensional shear bands in granular media |
title_sort |
identification of two-dimensional and three- dimensional shear bands in granular media |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/25355725916683709584 |
work_keys_str_mv |
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