Composite Repairs of Cracked Metallic Airframe Structures

Abstract

This report summarizes work that quantifies the benefits of composite patch repairs on cracked metallic aircraft structures. The first chapter describes a data base on bonding methods and repair materials that can be used in design and analysis. In the second chapter, analytical models are derived for the stress intensity factor of cracks in metallic sheets with bonded orthotropic repairs. Specific configurations included through-the-thickness center cracks, through-the-thickness cracks at a loaded fastener hole, surface cracks, and surface cracks at a hole. These analyses can be used in calculations of crack growth life extension resulting from the bonded repairs. Four types of specimens were tested in fatigue to verify the increase in fatigue life. The four configurations were edge crack specimens, surface specimens with multiple site damage (MSD).

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1993
Accession Number
ADA277680

Entities

People

  • E. F. Punch
  • J. H. Park
  • P. E. O'donoghue
  • Rhys Jones
  • S. N. Atluri

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Human Systems

DTIC Thesaurus Topics

  • Aircrafts
  • Complex Variables
  • Composite Materials
  • Computational Science
  • Creep
  • Fabrication
  • Finite Element Analysis
  • Fuselages
  • Geometry
  • Materials
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Shear Modulus
  • Stress Strain Relations
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Facility/Structural Engineering.
  • Materials Science (Mechanical Engineering).
  • Surface Coatings Technology.