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The Effects of Hole Size and Eccentricity on the Reliability of Notched Laminates

[+] Author Affiliations
R. Ganesan, Md. Ibrahim

Concordia University

Paper No. IMECE2005-79213, pp. 583-584; 2 pages
doi:10.1115/IMECE2005-79213
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Design Engineering, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Design Engineering Division
  • ISBN: 0-7918-4215-0 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Most of the practical engineering structures contain holes and cutouts of different sizes designed as parts of basic design, as in joints and assemblies, and for maintenance purposes. It is well known that holes and cutouts cause serious problems of stress concentrations due to the geometry discontinuity. These problems are even more serious in structures made of composite materials since the materials exhibit anisotropic behavior, and the structures are more sensitive to stress concentrations due to their brittle behavior. Because of its importance, engineers want to determine the effects of stress concentration, predict the failure and strength, and develop methods to reduce these effects. The stress distribution in the notched composite laminate is very sensitive to the size of the hole and the eccentricity of the hole from its desired location. In practice, many times during manufacturing the drilled hole is slightly offset from the desired location, and further there is variability in the size of the hole. These variations have a random distribution over the ensemble of laminates. In addition, composite materials display significant variability in their mechanical properties. As a result of the above-mentioned variabilities, the stress distribution in the laminate becomes stochastic in nature. In this circumstance, it becomes appropriate that the analysis of the notched laminates be carried out based on a stochastic approach and that the design is performed based on reliability requirement.

Copyright © 2005 by ASME

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