Non-Destructive Inspection of Composite Structures Using Modal Analysis.

Abstract

Anomalies from manufacturing variability or in-service damage are manifested as subtle differences in the inertial and stiffness matrices of otherwise identical components. Modal analysis seeks to model these constitutive relations by examining a structure's dynamic response to applied vibrations. In this investigation, characterization of anomalies in composite structures is attempted through multi-input, multi-output modal analysis. Two graphite-epoxy specimens manufactured by different processes are subjected to random excitation and frequency response functions are obtained. The dynamic behavior of the structures is compared through modal parameter extraction techniques. Dynamic solutions from a finite element model are used to validate the results. Finally, observations are made concerning the feasibility of extending the procedure to quality assurance and damage detection applications. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1995
Accession Number
ADA296673

Entities

People

  • Timothy S. Matthews

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Composite Materials
  • Composite Structures
  • Damage Detection
  • Detection
  • Dynamic Response
  • Frequency
  • Frequency Response
  • Frequency Shift
  • Graphitic Materials
  • Modal Analysis
  • Vibration

Fields of Study

  • Engineering

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Structural Health Monitoring of Composite Structures.