Learning Forum

[mert.dedebeyoglu]

I build a simple model with single beam element and applied pretension. After that, i applied 1000 N force to the system. I expect 1000N difference in the beam probe. However, the results are different. I couldn't find the reason. I also tried to use rigid bodies to understand and effect of the  stiffness of the bodies.

 

Can you help me ?

[Armin]

Hello there,

Part of the applied load will be used to deform the geometry and thus converted to internal energy in the system. That's why you can't simply subtract the applied load from the bolt pre-tension value. I assumed that you locked your bolt after pre-tension (screenshot below) which refers to maintaining the initial adjustment of the bolt pretension constant, allowing the preload force to vary as the model is loaded.

[mert.dedebeyoglu]

Thanks for your response. Yes i have locked bolt in following steps. The problem is that if i calculate by hand, i prefer subtract load from the pretension value to choose the bolt metric. Which one is the actual result? Is there any fundamental mistake in the hand calculation?