Summary of Test Results for Aluminum Alloy Box Beam Fatigue Program, Test Phases I-IV

Abstract

The results of a four-phase fatigue program for bending tests of 7075-T6 aluminum alloy box beams for positive loads only and for positive and negative loads for both constant-and variable-load amplitudes are presented. The relative damaging effect of four airplane flight-maneuver-loads spectra was determined, and the effects on fatigue life for variations in spectrum block size, stress level, stress direction, and load sequence were established and the results are discussed. When compared to full-scale aircraft structures of like material under constant-amplitude unidirectional loading on a percent of ultimate strength basis the beams represented the upper bound of those data for full-scale structures and exhibited similar fatigue characteristics. The beams were thus established as a suitable idealized structure for the investigation of those parameters which affect the structural fatigue life.

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Document Details

Document Type
Technical Report
Publication Date
Jun 08, 1972
Accession Number
AD0744673

Entities

People

  • William Breyan

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Wings
  • Aircrafts
  • Airframes
  • Airplanes
  • Aluminum Alloys
  • Box Beams
  • Combinatorial Analysis
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Flight Loads
  • Flight Maneuvers
  • Margin Of Safety
  • Materials
  • Mechanical Properties
  • Plastic Explosives
  • Standards
  • Stresses

Readers

  • Explosive Engineering.
  • Structural Health Monitoring of Composite Structures.