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Square tube

This is a sequence of problems for running problems with IGA. The first example shows steady state dynamics (SSD) with IGA, *ELEMENT_SHELL_NURBS_PATCH is used to define a shell nurbs element. The second example combines periodical load with IGA. In the third example, results can be compared with classical FEA. Examples 11.2-11.4 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.