Simulation and Testing of a Buckle POM design

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Hello everybody,
I am trying to SIMULATE different design options for a buckle. But I am a complete NEWBIE. I need some guidance. I have learned from official tutorials and some youtube tutorials... but still not sure of how to interpret them.
THE TEST: It should withstand at least 200kg of force.
*SETUP*
MATERIAL: POM (created a new material with this data here: http://polymerdatabase.com/polymer%20physics/Poisson%20Table2.html and here:http://www.designerdata.nl/plastics/thermo+plastics/POM+%28hom.%29?cookie=YES)
CONSTRAINTS: X;Y;Z bottom face of the bottom part of the buckle
LOADS: 1966 N on the top part.
CONTACTS: (0.26mm space- the 3d file was designed with 0.25 distance between moving parts) - contact type separation.
I am completely lost on how to properly test them. I have tried, static stress test (bottom part of the buckles locked and 200kg of force applied) and also with event simulation.
Can anyone help me?
I can send you the original 3D files if needed.
Here are the 2 Designs and the results.
And here are the 200KG results: