Can SW Simulation (Premium) calculate the stress in a sheet metal bend?
We are getting cracking in a hem after switching materials - it's obvious visually, but I'd like to put some numbers to the problem.
Yes it is possible for SW Simulation to calculate the Stress in the Sheet Metal bend. Try modeling/meshing the Sheet Metal component using the Shell Elements for this.
You could let us know more about it to throw some light on the problem.
It depends on what you want to simulate. What do you mean by, "...I'd like to put some numbers to the problem."?
Also keep in mind that your results will be HIGHLY dependent on having accurate stress-strain curve data for the specific material you're using.
...and when doing a bending problem it is nonlinear so you need to have true-stress vs. Log-strain data as outlined in the manual instead of typical engineering-stress vs. engineering-strain data.
Do you want to make simulation of the whole hemming proces (step 1: form sheet to 145 ded, step 2: flatten)?
It must be a big challenge.
I met with the similar problem: cracking for aluminium sheet after hemming.
Temper parameter was critical: changing from H22 to H111 solved the problem.
Maybe this hint will help you - good luck!
2 things; I've had this before with stainless when folding along the grain and folding across the grain resolved the issue for me.
FEA can also be performed on sheet; ideally you'll need to have at least 3 mesh triangles across the cross sectional area and /or reference the neutral plane.
what would the loading condition be? my guess is some kind of bending in one direction or another which will put the stress right where singularities would be likely so making estimates based on that will be very very very challenging.
lets say you can do this, what kind of change would you make to the design?
I think you are asking if you can simulate the forming of the hem in SW Simulation Premium. My guess would be probably not. Your elements are going to deform too much.
Jerry brings up a great point. SW can only use tetrahedral elements for its solid mesher and triangle elements for its 2/2.5D mesher. The element distortion in this model is going to be very high, so tet/tri elements will need to be very small in order to prevent element collapse.
I did a simulation somewhat similar to this for a term project in grad school
Retrieving data ...