Deformations in wide, center-notched, thin panels, part 2: finite element analysis and comparison to experimental measurements

ABSTRACT: Finite element analyses, for comparison with the experimental measurements, were performed for each panel described in Part I. Results indicate that (a) for the 305- and 610-mm panels, the finite element predictions and global experimental measurements for two of the displacement components, U(x, y, 0.80 mm) and W(x, y, 0.80 mm), are in good agreement throughout the panel, (b) for the 305- and 610-mm panels, the finite element predictions for the vertical displacement field V(x, y, 0.80 mm) are -5% lower than the measurements throughout the panel, (c) for the 1016-mm panel, the finite element predictions did not match the experimental measurements due to the specimen slipping in the grip fixtures, as shown in the full-field measurements, resulting in significant changes in the measured panel deformations, and (d) for all three panels, the local finite element predictions for the in-plane strain components, Exx, Exy, and Eyy, including the overall trends in both the size and shape of the large strain regions, are in quantitative agreement with experimental results. In summary, results indicate that an appropriate finite element method, capable of predicting the deformations observed in the structures to be modeled, will be effective in modeling the overall behavior of wide, flawed panels up to the onset of flaw growth. Furthermore, the combination of finite element analysis and three-dimensional measurements for accurate prediction of displacement boundary conditions is shown to be a viable hybrid approach for predicting flawed panel response.

3-D displacement data for 610 panel {W(x,y)} Theoretical data for 610 panel {W(x,y)}
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