Bending Moment Diagram

[metalboy]

Hi there, I'm relatively new to mechanica. I've run a simulation on a part and received satisfactory results. I'd like to obtain a bending moment and shear force diagram of the result, can anyone tell me if this is possible on pro mechanica? I only ask because i've noticed online that ansys has this capability.
thanks for any advice!
gary.

 

[Guest0527211403]

This can be done if you created a beam analysis.

In the "Result Window Definition" dialog box, change the following:

Type: Graph
Quantity: Shear & Moment
(Select all of the components you need)
Location: Set the beam element you want to analyze, and verify which end of the beam correspons to the left side of the graph.

 

[metalboy]

hi there,

thanks for the reply. i've tried what you suggested but have ran into a problem. When i try to choose a beam it tells me that there are no beams to choose. so, i presume i have to define a beam??? i tried to do this but it doesn't seem to want to let me choose a surface, but rather points only. is there a way of choosing a surface on my part to be treat as the beam in question? or is this not the correct way to go about it at all?

many thanks!
gary.

 

[Guest0527211403]

It seems you have analyzed a model with Solid Elements.

A Beam element is created along a datum curve or between two points. You define the material, cross section and orientation of the beam, and apply loads and constraints to points and curves.

If the part you are analysing has a constant cross section (or is a group of such elements, i.e. a truss or space frame), a beam element is much more effective than a solid model, and your analysis will run many, many times faster.

You can use the Graph Type to display quantities along a single edge in your model, but this would not yield bending moment and shear force diagrams. These diagrams typically apply only to elements of constant cross section.

 

[jdesouza]

If you are using your solid model and are in integrated mode of Pro-Mechanica, you can create a volume region or a surface region on the model. It's created as a sketch so you can use this to define the edges that would make your graph.

Run the FEA,

In the results window, look at a graph of the stress in the direction you care about (e.g. SXX). Choose the edge created by your volume or surface region.

Export the data to Excel, then transform the SXX data to Moment data by using the formula SXX=Mc/I from basic strengths of materials.

Or M=((SXX)(I)/c)

I think that is the most direct way to do it.