F-111 Stiffener Run Out #2 Parametric Study

Abstract

The Royal Australian Air Force (RAAF) currently has in service a fleet of F-111 aircraft. The conditions under which the RAAF operates these aircraft have proved to be conducive to cracking in the structurally critical wing pivot fitting, and certification testing in the cold proof load test has demonstrated failures at that location. The RAAF has contracted Lockheed Martin Tactical Aircraft Systems (LMTAS) to perform a Durability And Damage Tolerance Analysis on the aircraft. One control point of concern, in this report, is the Stiffener Run Out Number 2 in the wing pivot fitting. The Aeronautical and Maritime Research Laboratory (AMRL) developed a bonded boron/epoxy reinforcement to reduce the high plastic strains in this critical region, and as a result has significant experience in analysing this region. LMTAS, in conjunction with the RAAF, requested that the AMRL perform an elastic and plastic stress analysis of Stiffener Run Out Number 2 including the effect of varying the geometric parameters associated with it.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1999
Accession Number
ADA371994

Entities

People

  • Julian Paul

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Aircrafts
  • Airframes
  • Australia
  • Engineering
  • Finite Element Analysis
  • Geometry
  • Inspection
  • Intervals
  • Materials
  • Mechanical Engineering
  • Parametric Analysis
  • Plastic Properties
  • Residual Stress
  • Residuals
  • Strain Gages

Readers

  • Aerospace Engineering
  • Asian Economic Studies
  • Computer Science.