High Strain Rate Properties of Angle Ply Composite Laminates,

Abstract

Angle ply graphite/epoxy and graphite/s-glass/epoxy laminates were characterized in uniaxial tension at strain rates ranging from quasi-static -1 to over 5OO/s . Laminate ring specimens of +/+L5sub2s, +/-22.5sub2s, +/-30sub2s, +/-45)SUB2S, +/-60sub2s, +/-67sub2s and +/-75)SUB2S LAYUPS WERE LOADED UNDER INTERNAL PRESSURE. Results were presented in the form of stress strain curves to failure. Properties determined included moduli, Poisson's ratios, strength, and ultimate strain. In all seven laminates for the two materials tested, the modulus and strength increase with strain rate. The effect of strain rate varies with layup, being lowest for the fiber dominated +/-15sub2s laminates and highest for the matrix dominated +/-75sub25 laminates. The highest increments over the static values are 10% to 25% for the +/-L5sub2s layup and 200% to 275% for the +/-75sub2s layup. Ultimate strains do not show any significant trends with strain rate. In almost all cases the ultimate strain values are within +/-20% of the mean value and in half of the cases the deviations from the mean are less than 10%.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1981
Accession Number
ADA305387

Entities

People

  • I. M. Daniel

Organizations

  • IIT Research Institute

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Command And Control
  • Composite Materials
  • Epoxy Laminates
  • Explosives
  • Failure Mode And Effect Analysis
  • Graphitic Materials
  • Internal Pressure
  • Laminates
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Plastic Explosives
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Tensile Properties

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Organizational Psychology.
  • Reinforced Composite Materials