Deformable bolt modeling with initial stress

Hello Naresh Kini,

There are a few articles in Altair Community about this topic. Would you please take a look and see if it helps?

Pretension with /PRELOAD on solid bolt - Preload on solid bolt

Using /STATE to initialize elements in Radioss - Initializing element states in Radioss

3D Bolt Pretensioning - Video showing the workflow of pretensioning in HyperMesh

Radioss solid mesh Bolt preloading with 1D spring element - Bolt pretension using spring elements

Kind Regards,

Guilherme.

Hello Naresh Kini,

There are a few articles in Altair Community about this topic. Would you please take a look and see if it helps?

Pretension with /PRELOAD on solid bolt - Preload on solid bolt

Using /STATE to initialize elements in Radioss - Initializing element states in Radioss

3D Bolt Pretensioning - Video showing the workflow of pretensioning in HyperMesh

Radioss solid mesh Bolt preloading with 1D spring element - Bolt pretension using spring elements

Kind Regards,

Guilherme.

 

 

 

Hello Guilherme,

Thank you for the quick reply. Do we have a examples or similar presentation to represent deformable bolt with initial stress? This representation used to give very good correlation in LS Dyna and I would like to mimic same in radioss. It will be helpful if I get some tutorial to do same in Radioss.

Thanks & Regards,

Naresh Kini

Hello Guilherme,

Thank you for the quick reply. Do we have a examples or similar presentation to represent deformable bolt with initial stress? This representation used to give very good correlation in LS Dyna and I would like to mimic same in radioss. It will be helpful if I get some tutorial to do same in Radioss.

 

Thanks & Regards,

Naresh Kini

Hello Naresh Kini,

I don't have any article or presentation about this modeling, but I can share with you one model (please see attached).

The model is divided into two steps:

1. Pretension

In this step, only a pressure load is applied on the bolt (force can also be applied), and the element state is stored. With the element states stored for the bolt, one can import it in HyperMesh and apply the load case. For this step, refer to the article "Using /STATE to initialize elements in Radioss" I shared earlier. The process is the same here.

2. Displacement

After importing the *.sta in HyperMesh, one can apply the second case with the pretensioned bolt. For this model, an imposed displacement is applied to two opposite edges of the solid plate. As you can see, at the beginning of the second step, the bolt shows the initial stresses from step 1:

Simulation end:

I hope this helps.

Kind Regards,

Guilherme.

Hello Naresh Kini,

I don't have any article or presentation about this modeling, but I can share with you one model (please see attached).

The model is divided into two steps:

1. Pretension

In this step, only a pressure load is applied on the bolt (force can also be applied), and the element state is stored. With the element states stored for the bolt, one can import it in HyperMesh and apply the load case. For this step, refer to the article "Using /STATE to initialize elements in Radioss" I shared earlier. The process is the same here.

2. Displacement

After importing the *.sta in HyperMesh, one can apply the second case with the pretensioned bolt. For this model, an imposed displacement is applied to two opposite edges of the solid plate. As you can see, at the beginning of the second step, the bolt shows the initial stresses from step 1:

Simulation end:

I hope this helps.

Kind Regards,

Guilherme.

Thank you Guilherme