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Three-dimensional stress analysis of plain weave compositesTechniques were developed and described for performing three-dimensional finite element analysis of plain weave composites. Emphasized here are aspects of the analysis which are different from analysis of traditional laminated composites, such as the mesh generation and representative unit cells. The analysis was used to study several different variations of plain weaves which illustrate the effects of tow waviness on composite moduli, Poisson's ratios, and internal strain distributions. In-plane moduli decreased almost linearly with increasing tow waviness. The tow waviness was shown to cause large normal and shear strain concentrations in composites subjected to uniaxial load. These strain concentrations may lead to earlier damage initiation than occurs in traditional cross-ply laminates.
Document ID
19900008497
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Whitcomb, John D.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1989
Subject Category
Composite Materials
Report/Patent Number
NASA-TM-101672
NAS 1.15:101672
Report Number: NASA-TM-101672
Report Number: NAS 1.15:101672
Accession Number
90N17813
Funding Number(s)
PROJECT: RTOP 505-63-01-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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