Tensile Failure Prediction and Measurement in Composite Scarf Repair (Preprint)

Abstract

Oversized quasi-isotropic tensile specimens were manufactured from IM6/3501-6 graphite/epoxy prepreg. Seven specimens were scarfed in the center of the panel, and four of the panels were subsequently repaired. The repair patch consisted of a ply-by-ply replacement of the removed material with a FM-300M095 film adhesive placed between the repair patch and the scarfed specimen. The patch and adhesive were then co-cured. The repaired and unrepaired specimens were strain gaged and tested to failure. A three-dimensional failure analysis was performed. The strength prediction was based on the state of stress in the 0(exp 0) plies by taking into account the redistribution of stress due to adhesive failure. The performed analysis accurately predicted both the strength of the scarfed and repaired panels based solely on properties characterized by testing unnotched standard coupons.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2007
Accession Number
ADA473524

Entities

People

  • Benjamin M. Cook
  • David H. Mollenhauer
  • Endel V. Iarve
  • Gregory A. Schoeppner
  • Timothy D. Breitzman

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Adhesives
  • Air Force
  • Air Force Research Laboratories
  • Climate Change
  • Composite Materials
  • Delamination
  • Geometry
  • Government Procurement
  • Governments
  • Graphitic Materials
  • Laminates
  • Materials
  • Measurement
  • Military Research
  • Standards
  • Stress Concentration
  • Three Dimensional

Fields of Study

  • Materials science

Readers

  • Structural Health Monitoring of Composite Structures.