Effects of Battle Damage Repair on the Natural Frequencies and Mode Shapes of Curved Rectangular Composite Panels

Abstract

Interferometric holography and a finite element computer code, NISA, were used to experimentally and numerically determine the effects of battle damage repairs on the free vibrational behavior of thin, cylindrical composite panels. The primary objective was to experimentally determine how mass and stiffness changes introduced by mechanically fastened aluminum patches altered the natural frequencies and mode shapes of the panels. The secondary objective was to investigate the accuracy of the PC version of NISA in predicting the free vibrational behavior of the same panels. Keywords: Composites, Vibrations, Holography, NISA, Finite Elements, Natural frequencies, Mode shapes, Aircraft battle damage repair.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA203179

Entities

People

  • William P. Goodwin

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Aircrafts
  • Cameras
  • Composite Materials
  • Computers
  • Finite Element Analysis
  • Geometry
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Laboratories
  • Mechanics
  • Modal Analysis
  • Resonant Frequency
  • Stiffness
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.