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Size effect in composite materials and structures: Basic concepts and design considerationsComposite materials display strength characteristics that are similar to those of brittle ceramics, whose strengths are known to decrease with increasing volume for a uniform state of stress (size effect) and also are dependent on stress distribution. These similarities raise the question of whether there is also a size effect in composite materials and structures. There is significant, but inconclusive experimental evidence for the existence of a size effect in composites. Macroscopic and micromechanical statistical models have been developed which predict a size effect and are in general agreement with experimental data. The existence of a significant size effect in composites would be of great importance. For example, it would mean that use of standard test coupons to establish design allowables for large structures could be very nonconservative. Further, it would be necessary to analyze the strength of large composite structures using statistical methods, as is done for ceramics.
Document ID
19940033297
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zweben, Carl
(Martin Marietta Astro Space Philadelphia, PA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1994
Publication Information
Publication: NASA. Langley Research Center, Workshop on Scaling Effects in Composite Materials and Structures
Subject Category
Structural Mechanics
Accession Number
94N37808
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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