Characterization of Acoustic Emission Source to Identify Fracture in Concrete

Abstract

This report describes the theoretical basis, experimental approaches, and results of research to evaluate fracture properties of concrete using quantitative acoustic emission (AE) analysis techniques. Analytical tools were developed to process AE data. These tools included improvements in P-wave arrival analysis, AE source location calculation, and multichannel deconvolution techniques. The microfracture characteristics of mortar was evaluated using a three dimensional moment tensor analysis. Microcracking was found to be primarily mixed mode and shear. A new technique for testing concrete in uniaxial tension was developed. Using this technique localization and strain-softening behavior was examined. Microcracking was found to be evenly distributed throughout the specimen until about 80% of peak load. At this point localization began and the microcracks coalesced into a single macrocrack.... Acoustic emission, Microcracking, Quasi-brittle materials, Damage localization.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1993
Accession Number
ADA265743

Entities

People

  • Surendra P. Shah

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Algorithms
  • Composite Materials
  • Frequency
  • Geometry
  • Least Squares Method
  • Material Degradation Processes
  • Materials Testing
  • Measurement
  • Mechanics
  • Stress Strain Relations
  • Stresses
  • Tensor Analysis
  • Test Methods
  • Three Dimensional
  • Transducers
  • Wave Propagation

Fields of Study

  • Engineering

Readers

  • Materials Science (Mechanical Engineering).
  • Seismology
  • Structural Health Monitoring of Composite Structures.