Journal of Materials Science

, Volume 38, Issue 6, pp 1231–1238 | Cite as

Effect of a machining-induced defect on the tensile strength of a 3D composite material

  • Catherine Davy
  • Didier Marquis


This paper investigates the effect of finite specimen size upon the tensile failure of a tridirectional carbon-carbon composite along each reinforcement axis. Asymmetry in the position of load-bearing axial yarns across the cross-section is generated randomly by machining. This yields parasitic bending of the specimen, and thereby premature failure of the yarns subjected to the maximum bending stress. However, bending effects become negligible at final failure. Additionally, the composite failure strength σ F is determined from the cross-sectional area of the actually load-bearing axial yarns, using both symmetrical and asymmetrical specimens. Results are in good agreement with previous work, and we show that the variability of σ F is small.


Polymer Tensile Strength Composite Material Specimen Size Tensile Failure 
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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Catherine Davy
    • 1
  • Didier Marquis
    • 2
  1. 1.Department of EngineeringUniversity of CambridgeCambridgeUK
  2. 2.LMT CachanCachanFrance

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