AUTOMATIC CONSTRUCTION OF 3-D MODELS IN MULTIPLE SCALE ANALYSIS

This paper discusses techniques for the automatic construction of nume rical analysis models for multiple scale analyses which employ interac ting models at two, or more, physical scales. Consideration is given t o the methods to define the geometric representations and generate the discretizations needed by the numerical analysis procedures. The appl ication of the techniques to multichip modules and composite structure s, with interacting macromechanical and micromechanical level analyses , is demonstrated. In the multichip module analyses both heat conducti on and thermomechanical analysis are performed using different numeric al analysis techniques, and the two interaction of the analyses at the through levels is through a basic global/local methodology. The compo site structure analysis considers crack propagation at the micromechan ical level interacting with the macromechanical analysis through finit e element based adaptive multiscale analysis. In both example applicat ions the focus of the discussion is on the automatic construction of t he required geometric models and their automatic discretization.