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Microfabric quantitative test and analysis method for orthogonal anisotropy of granular material

An orthotropic, granular material technology, applied in the direction of analyzing materials, instruments, etc., can solve problems such as inability to describe orthotropic

Inactive Publication Date: 2015-07-08
NINGXIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above methods have their own advantages and disadvantages, but each method has certain limitations. It can only qualitatively obtain the structural anisotropy of granular materials for a certain material or a certain test method, and can describe the transverse anisotropy of granular materials. Anisotropic fabric, unable to describe orthotropy

Method used

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  • Microfabric quantitative test and analysis method for orthogonal anisotropy of granular material
  • Microfabric quantitative test and analysis method for orthogonal anisotropy of granular material
  • Microfabric quantitative test and analysis method for orthogonal anisotropy of granular material

Examples

Experimental program
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Embodiment 1

[0046]1. Solidification of orthotropic fabric of granular materials:

[0047] use figure 1 The sample preparation method shown produces sand samples of various orthotropic fabrics. figure 1 It is the sample preparation method of remolded sand. The sand sample mold is fixed by the mold frame 1, and the mold frame can be adjusted to different angles, and the sand falls into the mold from the sand spreader 2, and the layered sample is prepared (the excess moisture of the wet stamping method can be discharged through the conduit 3); After the sand sample reaches the sample preparation height, remove the excess sand sample, and keep the sand 4 on the top of the mold first; install the mold side plate 5, fix and turn over the mold frame 1, remove the excess sand 6, and the sand sample is completed.

[0048] In order to completely solidify the sand sample and reduce the influence of the sand-soil structure, the mold was gently placed in the sand sample solidification chamber, and t...

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Abstract

The invention relates to computational mechanics and constitutive modeling of granular material, and particularly to a microfabric quantitative test and analysis method for orthogonal anisotropy of granular material. The method is characterized by comprising the following steps: (1) curing the initial internal structure of granular material; (2) slicing a cured granular material sample, and milling and polishing the surface of a slice; and (3) observing and analyzing the microstructure on the surface of the slice by a scanning electron microscope, and performing quantitative test and analysis on the microfabric of orthogonal anisotropy of the granular material. Trial of the method shows that, by the method, the initial internal structure of the granular material can be fixed well, after the initial internal structure is maintained and cured elaborately and the surface of the slice is milled and polished, the internal structure of the granular material can be observed clearly in the scanning electron microscope, and on the basis, accurate execution of following analysis work is facilitated, and mechanical behaviors under complex conditions, such as granular material anisotropy and stress anisotropy, can be simulated accurately.

Description

technical field [0001] The invention relates to computational mechanics and constitutive simulation of granular materials, in particular to a method for quantitative testing and analysis of mesostructure of orthotropic anisotropy of granular materials. Background technique [0002] Gillott (1970) and Yoshinaka and Kazama (1973) used X-ray measurements. Moegenstern and Tchalenko (1967) used optical methods to study the grain orientation of clays. Kanatani (1984) discovered the torsional shear density function in tensor form. Kuo and Frost (1996,1997), Kuo et al. (1998) and Jang and Frost (1999,2000) provided a powerful fabric tensor analysis method based on stereometry combined with image analysis techniques. Arulamamdan and Dafalias (1979) and Anandarajah and Kuganenthira (1995) used a parameter to evaluate the conductivity of sandy soils. Jiang Jingshan of Hohai University and others used the computer image measurement and analysis system to analyze the multi-model test ...

Claims

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Application Information

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IPC IPC(8): G01N15/00
Inventor 李学丰刘金锋马文国胡钢墩
Owner NINGXIA UNIVERSITY
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