Please can someone give me guidance on SimulationXpress.

All I would like to do is find how much N it will require to break the tethers on this part (image below). But i don't really know where to find the result i am looking for.

The Material is HDPE, however its not standard. so my figures may be the problem (I have also attached them below).

My Knowledge on SimulationXpress is very limited so it may not even be the right tool for the job, but i have to ask.

Further part information,

Thanks in advance for any guidance and help.

SolidworksSimulation