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Cook's membrane

The Cook's membrane problem adapted from the paper1 is implemented in the example iks008_cooksMembrane.cpp. This problem can be solved not only with structured meshes provided, but also with unstructured and triangular meshes. The input parameters like material and grid parameters are read from the file iks008_cooksMembrane.parset. The problem can be solved also with the standard planar solid element, or with enhanced assumed strain elements. For more details on the element technologies, refer the documentation. iks008 solves the problem with a set of existing finite elements and compares the convergence rates.


  1. Robert D. Cook. Improved Two-Dimensional Finite Element. J. Struct. Div., 100(9):1851–1863, September 1974. doi:10.1061/JSDEAG.0003877