Analysis of Porous Laminates in the Presence of Ply Drop-Offs and Fastener Holes.

Abstract

Finite element analyses were carried out to predict the effects of microporosity, ply drop-offs and fastener holes on the compression behavior of AS1/3501-6 graphite/epoxy laminates. Both two dimensional (2-D) and three dimensional (3-D) analyses were performed. The validity of the analyses were established by comparing their predictions with available experimental results. The analysis of the ply drop-offs predicted little influence of their presence on the compressive strength. It also predicted that the laminate containing the Oo ply drop-off s should have about the same compressive strength in either the room temperature wet or dry states, which was also correlated experimentally. Likewise, the predicted strength reduction due to the presence of a circular hole in a specific laminate correlated well with available experimental data. (MM)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1984
Accession Number
ADA305631

Entities

People

  • D. E. Walrath
  • D. F. Adams
  • R. L. Ramkumar

Tags

Communities of Interest

  • Air Platforms
  • Cyber
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Compressive Strength
  • Epoxy Composites
  • Experimental Data
  • Failure Mode And Effect Analysis
  • Geometry
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Military Research
  • Stress Strain Relations
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Structural Health Monitoring of Composite Structures.