Actions for Effect of Discontinuities and Uncertainties on the Response and Failure of Composite Structures

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Effect of Discontinuities and Uncertainties on the Response and Failure of Composite Structures

Author
Poteat, Marcia M.
Published
December 2000.
Physical Description
1 electronic document
Additional Creators
Noor, Ahmed K. and Perry, Ferman W.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
The overall goal of this research was to assess the effect of discontinuities and uncertainties on the nonlinear response and failure of composite structures subjected to combined mechanical and thermal loads. The four key elements of the study were: (1) development of simple and efficient procedures for the accurate determination of transverse shear and transverse normal stresses in structural sandwiches as well as in unstiffened and stiffened composite panels and shells; (2) study the effects of transverse stresses on the response, damage initiation and propagation in composite and sandwich structures; (3) use of hierarchical sensitivity coefficients to identify the major parameters that affect the response and damage in each of the different levels in the hierarchy (micro-mechanical, layer, panel, subcomponent and component levels); and (4) application of fuzzy set techniques to identify the range and variation of possible responses. The computational models developed were used in conjunction with experiments, to understand the physical phenomena associated with the nonlinear response and failure of composite and sandwich structures. A toolkit was developed for use in conjunction with deterministic analysis programs to help the designer in assessing the effect of uncertainties in the different computational model parameters on the variability of the response quantities.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20010004734.
Terms of Use and Reproduction
No Copyright.
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