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Noninteractive macroscopic reliability model for ceramic matrix composites with orthotropic material symmetryA macroscopic noninteractive reliability model for ceramic matrix composites is presented. The model is multiaxial and applicable to composites that can be characterized as orthotropic. Tensorial invariant theory is used to create an integrity basis with invariants that correspond to physical mechanisms related to fracture. This integrity basis is then used to construct a failure function per unit volume (or area) of material. It is assumed that the overall strength of the composite is governed by weakest link theory. This leads to a Weibull type model similar in nature to the principle of independent action (PIA) model for isotropic monolithic ceramics. An experimental program to obtain model parameters is briefly discussed. In addition, qualitative features of the model are illustrated by presenting reliability surfaces for various model parameters.
Document ID
19890006066
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Duffy, Stephen F. (Cleveland State Univ. OH., United States)
Manderscheid, Jane M. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1989
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:101414
NASA-TM-101414
E-4512
Meeting Information
Meeting: International Gas Turbine and Aeroengine Congress and Exposition
Location: Toronto, Ontario
Country: Canada
Start Date: June 4, 1989
End Date: June 8, 1989
Sponsors: ASME
Accession Number
89N15437
Funding Number(s)
PROJECT: RTOP 505-63-31
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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