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Record Details

Record 10 of 79015
Size effect in composite materials and structures: Basic concepts and design considerations
Author and Affiliation:
Zweben, Carl(Martin Marietta Astro Space, Philadelphia, PA, United States)
Abstract: Composite 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.
Publication Date: Jul 01, 1994
Document ID:
19940033297
(Acquired Dec 28, 1995)
Accession Number: 94N37808
Subject Category: STRUCTURAL MECHANICS
Document Type: Conference Paper
Publication Information: NASA. Langley Research Center, Workshop on Scaling Effects in Composite Materials and Structures; p 197-217
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Martin Marietta Astro Space; Advanced Technology Div.; Philadelphia, PA, United States
Description: 21p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: COMPOSITE MATERIALS; COMPOSITE STRUCTURES; SCALE EFFECT; STRESS DISTRIBUTION; TENSILE STRENGTH; MATHEMATICAL MODELS; MICROMECHANICS; STRUCTURAL ANALYSIS; WEIBULL DENSITY FUNCTIONS
Imprint And Other Notes: In NASA. Langley Research Center, Workshop on Scaling Effects in Composite Materials and Structures p 197-217 (SEE N94-37796 12-39)
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