Predict failure/defects for the bending of an aluminum profile
Hi, I am trying to simulate the roll bending of an aluminum 6063 profile. I did a static structural simulation with 20 steps of 0.2 seconds, where the profile is supported by two rollers and a third one descends and bends the profile. The purpose of the analysis is to try and find out if this bending radius is possible with this material or not. Im using a bilinear isotropic hardening model for the aluminum. My question is, how would I identify the point of failure or the appearance of defects like thinning or wrinkling or something that could compromise the overall look of the part (its a visible part)? What Im doing right now is first, check that the total strain is not higher than the elongation at break of the material, and second, see the max stress and max strain output of the model and check if its before or after necking occurs, which would be after the material surpasses its ultimate strength (Zone A in the second picture). I thought that if necking occurs, then the material would start thinning or stretching, I dont know if thats the correct interpretation in this case. I would like to know if what Im doing makes sense, or if you have some better ideas of what I should be checking for in the model (or if the model itself could be improved).