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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Published on: September 29, 2019

Rotary shear experiments under X-ray micro-computed tomography.

Qi Zhao¹, Nicola Tisato², Giovanni Grasselli¹

¹Department of Civil Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada.

The Review of Scientific Instruments

|February 3, 2017

Summary

This summary is machine-generated.

A new rotary shear apparatus (ERDμ-T) combined with X-ray micro-computed tomography (μCT) allows real-time observation of material deformation. This innovation links physical parameters to internal structural changes during frictional sliding.

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Area of Science:

Materials Science
Mechanical Engineering
Tribology

Background:

Understanding frictional behavior and material deformation under shear stress is crucial for engineering applications.
In situ and in operando observation methods are needed to capture dynamic processes without perturbing experimental conditions.

Purpose of the Study:

To design, assemble, and calibrate a novel rotary shear apparatus (ERDμ-T) integrated with X-ray micro-computed tomography (μCT).
To demonstrate the capability of the ERDμ-T system for studying the frictional behavior and deformation of materials under shear stress.

Main Methods:

Development and calibration of the ERDμ-T apparatus for precise measurement of normal force, torque, sample shortening, and shearing velocity.
Integration of X-ray micro-computed tomography (μCT) for in situ and in operando visualization of internal specimen deformation during shearing.
Performing shear experiments on an aluminum alloy sample at incremental steps.

Main Results:

Successful demonstration of the ERDμ-T apparatus's capability to study frictional behavior.
Acquisition of μCT imagery synchronized with physical measurements, providing a comprehensive understanding of deformation processes.
Observation of how rough surfaces interact and deform under controlled pressure and temperature.

Conclusions:

The ERDμ-T system effectively links variations in physical parameters to the evolution of internal material structures.
The combined apparatus provides novel insights into fracturing and frictional sliding mechanisms in solid materials.
This technology enables non-perturbative, real-time analysis of material deformation during shear testing.