Abstract
Solid modeling has improved communications among the three major elements of an engineering process: design, analysis and manufacture. Recent developments in analytic solid modeling are reviewed that extend these improvements to conceptual design and to the representation of materials with internal geometry. Vector fields, Boolean operations on sculpted solids and new data links to engineering tomography in the PATRAN system are representative of these developments. Applications are reviewed using new advanced materials that indicate extensions of the current IGES system are needed to define material geometry for solids that include one or more fibrous phases. Working with these materials is a challenge facing an increasing number of designers and analysts in almost all fields of engineering.
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