handling of localilzed stress peaks in FEA

[Qluq]

Hi everyone,

i am still very new to FEA and continuing to ask questions. i am wondering about the following:

when simulating an almost square cabinet, lifted by two points on the diagonal, i find some very localized stress peaks. filleting sharp reentrant corners does not take away the stress peaks, but adding structure does.

even though the stresses are beyond the yield stress, the equivalent strains are quite small. is it safe to assume that, as long as the stress state is not hydrostatic, the material will only deform plastically in a very small volume and NOT rupture?

thanks, Mark

 

[realtime2]

If you are using an elastic FEA and get stress
peaks above the yield, you can use a equivalent
energy analysis to approximate the local plastic stresses and strains.
Check on "Neuber Plasticity Correction" on the web.
What one then does with these corrected stress-strains depends
on the application such as fatigue or one-time load.