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An expert system for metal matrix composite selection and design

University of British Columbia

This thesis summarizes the development and components of an expert system which supports engineers in the selection and design of metal matrix composites(MMCs). The system consists of a dynamic hypertext interface integrated into an expert system developed within the COMDALE/X environment. Mechanical and thermophysical material property data for matrix alloys, reinforcement materials, and MMCs is stored in databases accessed by the expert system. Mathematical models which utilize constituent material properties to determine effective composite properties are managed by the system to design metal matrix composites and fill in property gaps. Effective elastic modulus, thermal conductivity, coefficient of thermal expansion, Poisson's ratio, shear and bulk moduli mathematical models for particulate, whisker, short fiber and fiber composites are contained in a spreadsheet managed by the system. Although the physical and mechanical properties may often limit the constituent selection, it is the chemical reactivity of the ceramic reinforcement with the matrix alloy either during service or fabrication which will generally control the final matrix/reinforcement combination. As a result, constituent material compatibility has been determined and incorporated in the system. A database of appropriate reinforcement coatings for applicable matrix/reinforcement systems is also included. MMC material properties are directly influenced by manufacturing techniques. Although a variety of fabrication methods exist, they are limiting factors which control the availability of a suitable method for any given material design. As a result, a decision analysis technique has been developed to predict suitable manufacturing methods. The system hypertext document is an on-line reference setup to allow easy access to materials information. Materials selection, effective composite property information, mathematical modeling, constituent compatibility, and manufacturing methods are among the topics covered. Relative manufacturing costs have been determined and these have been summarized in the hypertext document. A cost database of reinforcement and MMC materials has also been compiled. Three consultation sessions have been included to demonstrate the capabilities of the expert system. Finally, system validation and evaluation are discussed.

Thesis/Dissertation

application/pdf

2009-02-06

For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

http://hdl.handle.net/2429/4242

Materials Engineering

University of British Columbia

UBCV

DSpace