Measurements of the Out-of-Plane Displacement of an Axially Loaded Cracked Metal Sheet with a CFRP (Carbon Fibre Reinforced Plastic) Repair Patch.

Abstract

An adhesively bonded carbon fibre reinforced plastic (CFRP) repair patch situated centrally on one face of a 1.6mm thick sheet test piece of aluminum alloy 7475-T761 containing a central fatigue crack caused an out-of-plane displacement when the test piece was loaded in tension normal to the crack length. Out of plane displacements for two crack length (2a = 75 mm and 2a = 94 mm) were measured using a dial guage. The magnitude of the displacement depended upon crack length and was nonlinear function of applied load. A greater displacement per load increment occurred at low loads and there was a tendency towards a limiting value at high loads. A moire shadow technique was also used to measure displacement and the results agreed well with dial guage measurements. Keywords: Fatigue, Aluminum alloy, Repair patch, Carbon fibre.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1986
Accession Number
ADA188076

Entities

People

  • R. M. Kemp

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Carbon Fiber Reinforced Polymer
  • Carbon Fibers
  • Composite Materials
  • Crack Tips
  • Fibers
  • Light Sources
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Shear Modulus
  • Shear Stresses
  • Skull
  • Stress Intensity Factors
  • Stresses

Readers

  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials