Finite Element Method for the Finite-Displacement Analysis of Sandwich Composite Panels.
Final rept. Jul 75-Jul 76,
DAYTON UNIV OHIO RESEARCH INST
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A finite element method is presented for the large deflection analysis of flat, layered sandwich panels having arbitrarily-shaped boundaries. Fully compatible isoparametric elements based upon Hermite bicubic interpolation are formulated, and requirements for the satisfaction of both displacement and slope compatibility are discussed. As special cases, the analysis can be applied to thin laminated plates and multicore sandwich, as well as elastically-supported plates. Solutions for geometrically nonlinear behavior are obtained by either the conjugate gradient or variable metric method. Applications presented include rectangular, skewed, annular and circular geometries. The analysis is shown to maintain displacement and stress accuracy for elements having extremely large aspect ratios, or edges which degenerate to a single point. Author
- Numerical Mathematics
- Structural Engineering and Building Technology