National Technical Reports Library - NTRL

National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.




Details
Actions:

Elastic Wave Velocity and Attenuation as Used to Define Phases of Loading and Failure in Coal.


PB91230318

Publication Date 1991
Personal Author Shea-Albin, V. R.; Hanson, D. R.; Gerlick, R. E.
Page Count 50
Abstract The U.S. Bureau of Mines report discusses elastic wave velocity and attenuation behavior as an indicator for changes in load and structural integrity of coal samples. Measuring changes in compressional (P)-wave and shear (S)-wave attenuation and velocity under uniaxial and triaxial compression tests revealed their effectiveness for distinguishing changes in applied load and structural failure of samples. The velocity and attenuation values were used in further calculations such as ratios of P-wave to S-wave values, dynamic elastic constants, normalized velocities, and attenuation coefficients to reveal trends for loading and failure. The behavior of both P-wave and S-wave attenuation and velocity together defines distinct and consistent phases of load change and failure for uniaxial and triaxial tests. The S-wave velocity and attenuation illustrate changing axial load and initial development of microfractures within the sample preceding structural failure more clearly than those of the P-wave. The attenuation and velocity ratios and dynamic elastic constants (except the bulk modulus) respond to closure of small preexisting fractures within the coal sample with initial loading to failure of coal samples. The attenuation coefficients and normalized velocities reveal trends similar to those shown by velocity and attenuation.
Keywords
  • Failure
  • Coal deposits
  • Loads(Forces)
  • Elastic waves
  • Attenuation
  • Nondestructive tests
  • Wave propagation
  • Test facilities
  • Mechanical properties
  • Velocity
  • Fractures(Materials)
  • Fracture properties
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 94J - Nondestructive Testing
Corporate Authors Bureau of Mines, Denver, CO. Denver Research Center.
Supplemental Notes Library of Congress catalog card no. 90-49808.
Document Type Technical Report
Title Note Rept. of investigations/1991.
NTIS Issue Number 199122
Elastic Wave Velocity and Attenuation as Used to Define Phases of Loading and Failure in Coal.
Elastic Wave Velocity and Attenuation as Used to Define Phases of Loading and Failure in Coal.
PB91230318

  • Failure
  • Coal deposits
  • Loads(Forces)
  • Elastic waves
  • Attenuation
  • Nondestructive tests
  • Wave propagation
  • Test facilities
  • Mechanical properties
  • Velocity
  • Fractures(Materials)
  • Fracture properties
  • Bureau of Mines
  • 48A - Mineral Industries
  • 94J - Nondestructive Testing
Loading