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FRF for a cantilever with pre-stress condition

This cantilever model shows how to run FRF examples with pre-stress condition. The first file shows the usual *FREQUENCY_DOMAIN_FRF setup without pre-stress. In the second file *INTERFACE_SPRINGBACK_LSDYNA is used to create a dynain-file, which is then the basis for pre-stress analysis with *INCLUDE. In addition, usage of intermittent eigenvalue analysis is shown. Example 4.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.