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FE Modeling Technique by using SOL601

Hello Experts,


I want to model a non-linear problem as per attached image.


Objective of problem to find the force required to travel the rod by 7mm held between two bushings at both ends, against spring force (0.9N/mm) also the rod having reaction force of 6 N exerted by rubber bumpers mounted in bushings.


Kindly suggest your best methods to model & solve this problems.


I am Using NX8.5.3.3 for modeling purpose and NX Nastran 8.5 desktop bundle for solving purpose.



Thanks and Regards,