Effects of Notch Geometry and Moisture on Fracture Strength of Carbon/ Epoxy and Carbon/Bismaleimide Laminates

Abstract

Cross-ply panels of various ply orientations and 1 to 2-mm thickness were tested in tension with a center notch to determine the translaminar fracture toughness and in bending with no notch to determine the bulk flexural strength and modulus. Carbon/epoxy panels with a variety of notch lengths and widths were subjected to laboratory air conditions before testing. Carbon/ bismaleimide panels with one basic notch configuration were tested in three pretest exposure conditions: laboratory air; a 4000-hour exposure in a controlled moisture chamber; and a 4000-hour exposure in a natural tropical environment.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1990
Accession Number
ADA231892

Entities

People

  • I. A. Burch
  • John H. Underwood
  • Saumil Bandyopadhyay

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Electron Microscopes
  • Environment
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Flexural Properties
  • Flexural Strength
  • Fracture (Mechanics)
  • Laminates
  • Materials
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Military Research
  • Reinforced Plastics
  • Test Methods

Readers

  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.