I am running a simulation and I need to see if the bolts will hold, but the model keeps telling me that there is a large displacement. A little while later, it tells me it cannot run the study because of abnormal bolt pretension. Is there something I am doing wrong? I have 16 bolts all pretorqued to 150 lb-in.
Hi Brandon,
This can occur by mistake if the bolt connection is extremely soft. This can be the case if one or more of the following is true:
• A gap separates the components tightened by a Bolt Connector. This should not be the case. The components should be touching.
• The diameter of a bolt is extremely small.
• The material of a Bolt Connector or of a component tightened by a Bolt Connector is extremely soft.S-074092
To find out more, please check S-074092 in the KB.
Best,
Mohamed
Large displacement can occur when the model is not properly fixed. You should check if there are Degrees Of Freedom (DOFs) left in your model. When using bolts it usually occurs if the tight fit option in the bolt properties is not selected.