The Yield Behaviour of a Structural Adhesive Under Complex Loading

Abstract

Recent developments in bonded composite repair technology at the Aeronautical and Maritime Research Laboratory (AMRL) have been in the area of repairs to curved surfaces, eg. the proposed repairs to the F/A-18 aileron hinge and the F/A-18 bulkhead crotch region. Bonded composite repairs to curved surfaces induce through-thickness stresses as well as shear stresses in the adhesive. The yield behaviour of AMRLs most common repair adhesive - FM73 - has not been investigated under such conditions of combined loading. Reported herein is a yield function for the repair adhesive FM73, based upon the Modified Drucker-Prager/Cap Plasticity model. This yield function was selected based on experiments on a test specimen subjected to a range of combined stress states. A finite element (FE) analysis of test specimen (Iosipescu test specimen modified for adhesives) was carried out to establish its validity for obtaining data.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1998
Accession Number
ADA360569

Entities

People

  • Chun Wang
  • Mladen Ignjatovic
  • Peter Chalkley

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Airframes
  • Composite Materials
  • Engineering
  • Engineers
  • Equations
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Materials
  • Materials Science
  • Mechanical Engineering
  • Mechanics
  • Plastic Properties
  • Shear Stresses
  • Stress Analysis
  • Stresses
  • Universities

Fields of Study

  • Engineering

Readers

  • Structural Health Monitoring of Composite Structures.