Identification of the bolt connection model in LS-Dyna
Николай Водяхин
l...@schwer.net
My guess is if you ran your simulation with a slower loading rate, e.g. half as fast for twice as long, you would see some difference in the response. This should be easy to verify. [Note: due to geometric symmetry, you could model half or a quarter of the pictured bolted joint to reduce overall CPU time.]
Likely the main reason for the differences between your simulation and the test result is the lack of bolt pre-tension, friction between plates and some mismatch between the bolt diameter and the corresponding holes, i.e. the bolts and holes are not exactly the same dimension.
--len
From: ls-d...@googlegroups.com <ls-d...@googlegroups.com> On Behalf Of Николай Водяхин
Sent: Thursday, November 27, 2025 4:42 AM
To: LS-DYNA2 <ls-d...@googlegroups.com>
Subject: [LS-DYNA2] Identification of the bolt connection model in LS-Dyna
Good afternoon! I am modeling and calculating a bolted connection in LS-Dyna. The joint is a shear joint without pre-tensioning the bolts. The joint consists of three plates connected by two bolts.
A question arose in comparing the results, the FEA deformation graph differs from the experiment. In the experiment, the load is applied in steps with a certain step, we can say static. Can you tell me if the difference in the graphs can be related to the calculation time that I specify in LS-Dyna?
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