Method for Monitoring In-Plane Shear Modulus in Fatigue Testing of Composites

Abstract

A method was developed for nondestructive intermittent monitoring of inplane shear modulus of composite specimens undergoing fatigue loading. A modified three-rail shear fixture was designed for easy mounting and disassembly. The shear strain is measured with an extensometer attached to the rails of the fixture. Modulus results were in excellent agreement with independently measured values. The method is ideal for studying damage development, since the in-plane shear modulus is sensitive not only to transverse matrix cracking but also to longitudinal cracking and delamination.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1986
Accession Number
ADA244896

Entities

People

  • G. Yaniv
  • I. M. Daniel
  • J. W. Lee

Organizations

  • Northwestern University

Tags

DTIC Thesaurus Topics

  • Assembly
  • Composite Materials
  • Delamination
  • Disassembly
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Graphitic Materials
  • Laminates
  • Materials
  • Measurement
  • Mechanics
  • Military Research
  • Monitoring
  • Shear Modulus
  • Shear Stresses
  • Strain Gages

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.