Damage Tolerance Characterisitics of Composite Sandwich Structures

Abstract

Current damage tolerance requirements impose strict constraints on the design of composite aircraft structures, since the various forms of defects taken into consideration must show no-growth' characteristics in the environmental and loading conditions expected in the operative life. A research activity was carried out by Agusta, in collaboration with the University of Pisa, with the purpose of assessing the damage tolerance characteristics of typical composite sandwich structures used by the helicopter industry. A particular effort was dedicated to the study of delamination growth under compression loading, a basic step for understanding the damage tolerance behavior of composite structures. The results of the numerical analysis carried out show that G, the Strain Energy Release Rate, is a suitable parameter for describing the behavior of the delamination, but it is essential to consider its partition according to the fundamental modes.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2000
Accession Number
ADP010637

Entities

People

  • L. Lazzeri
  • U. Mariani

Organizations

  • University of Pisa

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Composite Aircraft
  • Composite Materials
  • Composite Structures
  • Damage Tolerance
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Helicopters
  • Lepidoptera
  • Materials
  • Mechanics
  • Numerical Analysis
  • Rotary Wing Aircraft
  • Sandwich Panels
  • Static Tests
  • Test And Evaluation

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials