Dynamics-based Nondestructive Structural Monitoring Teclrniques

Abstract

A novel Ultrasonic Modal Analysis Teclrnique (UMAT) capable of damage detection in 3-dimensional, non-homogeneous, anisotropic structures based on ultrasonic vibration signatures was developed and implemented into a portable inspection system. The system contains an annular array actuator that is capable of providing various guided wave modes and frequencies as the loading functions to achieve high sensitivity to different defects. An analytical theory on guided wave excitations by annular arrays with/without time delays was developed. The theory can be applied for optimizing annular array designs for UMAT and also conventional transient ultrasonic guided wave applications. Key experiments were conducted on different test samples including realistic aircraft composite structures to demonstrate the high damage detection sensitivity ofUMAT as well as its capability of damage differentiation.

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Document Details

Document Type
Technical Report
Publication Date
May 21, 2012
Accession Number
ADA569293

Entities

People

  • Fei Yan
  • Joseph L. Rose
  • Michael J. Avioli

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Composite Materials
  • Computer Programs
  • Damage Detection
  • Detection
  • Doppler Effect
  • Finite Element Analysis
  • Laminates
  • Mechanics
  • Modal Analysis
  • Modulus Of Elasticity
  • Resonant Frequency
  • Structural Health Monitoring
  • Three Dimensional
  • Transducers
  • Two Dimensional
  • Wave Propagation
  • Waveforms

Readers

  • Optical Physics and Photonics.
  • Structural Health Monitoring of Composite Structures.