Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

In developing micromechanical models of constitutive behavior, granular materials are treated as ensembles of discrete particles. The macroscopic mechanical properties of these materials are derived from force-deformation relations [1], which describe the behavior of particle-to-particle contacts at the microscopic level. The occurrence and behavior of these contacts are controlled by the packing structures in the granular system. The packing structures used in many current approaches to modeling granular materials are either regular [2,3,4] or numerically-generated random packings [5]. To properly account for actual particle packings, however, it is desirable to develop an experimental technique for direct observation. In this paper, the microstructures of simplified materials (laboratory packed spherical particles) are investigated using X-ray computerized tomography (CT), which provides a non-intrusive way to obtain cross-sectional images of material samples. Series of these digital images are then processed to reconstruct the three-dimensional internal structure of the sample using numerical techniques. Scanning and image analysis results for a sample made of glass spheres are presented in this paper, demonstrating the potential of CT technology in identifying the microstructures of granular materials.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 6: Material Properties

Section

Metals

Pages

1674-1680

DOI

10.1007/978-1-4615-2848-7_214

Language

en

File Format

application/pdf

Included in

Metallurgy Commons

Share

COinS
 
Jan 1st, 12:00 AM

Characterization of the Internal Microstructures of Granular Materials Using Computerized Tomography

La Jolla, CA

In developing micromechanical models of constitutive behavior, granular materials are treated as ensembles of discrete particles. The macroscopic mechanical properties of these materials are derived from force-deformation relations [1], which describe the behavior of particle-to-particle contacts at the microscopic level. The occurrence and behavior of these contacts are controlled by the packing structures in the granular system. The packing structures used in many current approaches to modeling granular materials are either regular [2,3,4] or numerically-generated random packings [5]. To properly account for actual particle packings, however, it is desirable to develop an experimental technique for direct observation. In this paper, the microstructures of simplified materials (laboratory packed spherical particles) are investigated using X-ray computerized tomography (CT), which provides a non-intrusive way to obtain cross-sectional images of material samples. Series of these digital images are then processed to reconstruct the three-dimensional internal structure of the sample using numerical techniques. Scanning and image analysis results for a sample made of glass spheres are presented in this paper, demonstrating the potential of CT technology in identifying the microstructures of granular materials.