Mirroring blast load affects 1

[mdan90]

Is there a way of mirroring blast loads (CONWEP) into static loads and get accurate similarities? In my model, I simulated a blast load acting on a honeycomb and my objective is to optimize the honeycomb structure to reduce displacement but due to the fact that the optimization module in Abaqus doesn't work with the explicit solver I have to mirror the bast load into static load to make the analysis implicit and then optimize it. I would really appreciate it if anyone could help since i am stuck.

 

[Mustaine3]

If you use exactly the same mesh in both analysis, then you could write out the nodal displacements at the outer region and apply that as displacement BC in the implicit analysis.

 

[mdan90]

Thanks for the response Mustaine2. If you could give me instructions on how to do that I would really appreciate it.

 

[Mustaine3]

Thanks for the downgrade

There are many ways to do it. You should create a set with the nodes you want to use for that process first. Then you could use *Node Print to write the nodal displacements into the .dat or you create a report in A/Viewer during postprocessing. When you display only that node set, then the report will only contain these entities.

When you have the data in a text file, you have to check if the format is correct and then you could copy th data as BC in your new analysis. Or keep the data in the separate file and you use *Include to refer to that.

 

[mdan90]

Hahaha sorry about that Mustaine3. Thanks a lot for the response you got me out of a sticky position.

 

[mdan90]

Mustaine3 your suggestion mirrored the effects accurately but I got a problem. ABAQUS cannot optimize the displacement of the honeycomb due to predefined displacement. Is there any way through my problem? Any suggestion would be greatly appreciated.

 

[rstupplebeen]

Instead of minimizing the displacement can you maximize the force?

Rob Stupplebeen
Rob's Engineering Blog
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[mdan90]

I am afraid not rstupplebeen. The objective of the optimization is to minimize displacement.

 

[rstupplebeen]

Can you apply the displacements on the nominal design, get the nodal forces, then apply them to the model. If the results are the same the conversion worked. Then you can monitor displacement while optimizing the design for stiffness.

Rob Stupplebeen
Rob's Engineering Blog
Rob's LinkedIn Profile

 

[mdan90]

rstupplebeen could you please elaborate on your suggestion for the optimization procedure, it would really be helpful.