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Advanced Performance Materials

, Volume 2, Issue 2, pp 161–176 | Cite as

Strength analysis for three-dimensional fiber reinforced composites

  • Kanehiro Nagai
  • Atsushi Yokoyama
  • Zen-Ichiro Maekawa
  • Hiroyuki Hamada
Article

Abstract

Three-dimensional fiber reinforced composite materials produced by impregnating resin into woven fabric have superior interlaminar and impact strength and are capable of being formed into complex shapes. Consequently it is expected in the future that they will be used for various structural members which have to date been difficult to make with conventional composite materials. With the growth in their fabrication technoloy, the development of a strength analysis method is being demanded. This paper describes a strength analysis method for three-dimensional composite materials on the basis of a micro-mechanical analysis of a unit cell. The unit cell is a small geometrical unit of fiber architecture. A feature of the present analysis method is to represent a unit cell as a rigid frame structure constructed of fiber-beam elements and matrix-beam and matrix-rod elements. Strength analyses are made for orthogonal weave and 5-axial weave three-dimensional carben/epoxy composite materials; the tensile, compressive, and shear moduli and strengths, and Poisson's ratio are calculated. The analytical results show fairly good agreement with experimental results; 11%, 21%, and 20% differences between them on the average for elastic moduli, strengths, and Poisson's ratios, respectively. It is also understood that the present idealized analysis model cannot accurately predict the characteristics of undulated fiber composites, especially in respect to the compressive strength.

Key words

finite-element method strength analysis three-dimensional composite material unit cell 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Kanehiro Nagai
    • 1
  • Atsushi Yokoyama
    • 2
  • Zen-Ichiro Maekawa
    • 3
  • Hiroyuki Hamada
    • 3
  1. 1.Nagoya Aerospace Systems WorksMitsubishi Heavy Industries, Ltd.NagoyaJapan
  2. 2.Mie UniversityTsu, MieJapan
  3. 3.Kyoto Institute of TechnologyKyotoJapan

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