Reduced Stiffness Method for Onset of Delamination.

Abstract

The reduced stiffness method has been used to determine the onset of delamination for a number of different layups of AS4/3501.6, T300/934 and T300/520S graphite epoxy plates. The results are very good. The advantage is that it is not necessary to calculate detailed stresses in the third direction and to calculate local stresses at the surface of the plate. In order to make the method applicable for the Finite Element Method it is necessary to investigate situations with varying stresses. Also it is likely, that the onset of delamination will be different for the stresses in the two perpendicular directions of the laminate. In cases where both stresses are near to the delamination initiation stress, the two probably will interact. Also the interaction between transverse matrix cracking and delamination has to be investigated further.

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Document Details

Document Type
Technical Report
Publication Date
Aug 30, 1996
Accession Number
ADA321181

Entities

People

  • J. Van Den Eikhoff

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Classification
  • Composite Materials
  • Construction
  • Delamination
  • Engineering
  • Epoxy Laminates
  • Finite Element Analysis
  • Graphitic Materials
  • Laminates
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Stiffness
  • Three Dimensional
  • Transverse

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  • Structural Health Monitoring of Composite Structures.