A Study of Stiffness, Residual Strength and Fatigue Life Relationships for Composite Laminates.

Abstract

The purpose of this research investigation was to explore, in both a qualitative and quantitative fashion, the relationship among stiffness, strength, fatigue life, residual strength, and extent of damage of unnotched, graphite/epoxy laminates subjected to tension loading. The study consisted of experimentation on a wide range of laminates involving detailed observations of damage development and progression and the correlation of this damage to stiffness, strength, and fatigue life. Damage states were analyzed and extensively mathematically modeled in order to delineate and understand the relationship among the measured variables. Enough understanding of the tension loaded case was developed to allow development of a proposed, simple procedure for calculating strain to failure, stiffness, strength, data scatter, and shape of the stress-life curve for unnotched laminates subjected to tension load.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1983
Accession Number
ADA307831

Entities

People

  • F. W. Crossman
  • J. T. Ryder

Organizations

  • Lockheed Martin

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Composite Materials
  • Databases
  • Epoxy Laminates
  • Finite Element Analysis
  • Geometry
  • Laminates
  • Measurement
  • Mechanical Phenomena
  • Mechanical Properties
  • Mechanics
  • Plastic Explosives
  • Statistical Distributions
  • Strain Gages
  • Stress Strain Relations
  • Tensile Strength
  • Three Dimensional

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.
  • Theoretical Analysis.