Isoparametric finite elements for free vibration analysis of shell segments and non-axisymmetric shells

In reference [1] the eight-node isoparametric shell element with a reduced number of integration points was reported to be incapable of capturing rapid local changes in curvature. In the study reported here, eight- and ten-mode elements have been employed to represent shells having geometries with sharp curvatures or with sharp corner connections. The effect of different numbers of integration points on the performances of these elements has been surveyed. The information obtained from this survey has been used in predicting the natural frequencies of an oval cross-section hollow shell and a hollow turbine blade.