National Program for Inspection of Non-Federal Dams. Townsend Harbor Dam (MA 00138), Merrimack River Basin, Townsend, Massachusetts. Phase I Inspection Report.

Abstract

A generalized theory of acoustic emission (AE) is developed on the basis of the theory of elastodynamics and dislocation models. Acoustic emission sources are represented as dislocation sources and include both discontinuities of displacement components and tractions. As AE waves are observed at a stress free surface, Green's functions in a half space are obtained. Fortran programs for computing these functions for non-Cauchy solids are used to calculate AE waveforms from a point crack and moving cracks. Their implication on current attempts of determining source characteristics via deconvolution is discussed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA146332

Entities

Organizations

  • New England District, U.S. Army Corps of Engineers

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Construction
  • Dams
  • Drainage Basins
  • Embankments
  • Engineering
  • Engineers
  • Failure Analysis
  • Flood Control
  • Floods
  • Gates
  • New England
  • Operating Systems
  • Plastic Explosives
  • Safety
  • Visual Inspection
  • Warning Systems
  • Weirs

Readers

  • Hydrologic Risk Analysis and Mitigation.
  • Materials Science (Mechanical Engineering).
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Space