## Robot Structural Analysis

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# Plate (shell elements) buckling

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I have a steel plate, say 2000x1000x10 mm, which will be lifted in vertical position.

This will be done by adding two lifting lugs on the side (in this case the 2000x1000mm area) of the plate and using a sling to lift the plate.

Due to the excentricity of the lifting lugs the plate will rotate a little bit, due to which the plate will bend (it is not exactly vertical anymore and gravity will make the plate bend). Due to the slings a horizontal compressive force is introduced which can make the plate buckle.

I want to model the plate using shell elements and calculate the deformation and stresses using this model.

Is there a way in Robot to also check the buckling of this plate in the situation mentioned above?

Thanks in advance for your replies.

# Re: Plate (shell elements) buckling

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You can run buckling analysis for a shell model.

*If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.*

**Artur Kosakowski**

# Re: Plate (shell elements) buckling

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Can you please tell me how I can run such an analysis?

And what is the result of the analysis? A load multiplier?

# Re: Plate (shell elements) buckling

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Can you please tell me how I can run such an analysis?

In the same way as for a bar structure. You need to change the analysis type.

And what is the result of the analysis? A load multiplier?

Correct.

**Artur Kosakowski**

# Re: Plate (shell elements) buckling

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Hi, I am a new RSA user and I have run a buckling analysis for a shell under axial compresion. However, I cannot find information in the results menu about if the plate is buckling or not. Could you help me with this.

# Re: Plate (shell elements) buckling

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1. Run buckling analysis for more than 1 mode

2. Check the value of the critical coefficient

*If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.*

**Artur Kosakowski**

# Re: Plate (shell elements) buckling

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Thanks Artur for your quick reply. I have spent some time looking for a defintion of "critical coeff." in the RSA help file but I couldn't find it. Could you please provide it for me? Is there in RSA a routine calculation for the shell ultimate strength?

# Re: Plate (shell elements) buckling

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I have spent some time looking for a defintion of "critical coeff." in the RSA help file but I couldn't find it.

Is there in RSA a routine calculation for the shell ultimate strength?

I'm not sure if i understand you correctly but you may want to check values of stresses e.g. von Misses either on a map or in the table.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

**Artur Kosakowski**

# Re: Plate (shell elements) buckling

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