Parallel Axis Theorem for Z ? 1

[271828]

I need to calculate the plastic section modulus for some moderately complicated shapes.

If I were computing the elastic section modulus (via the moment of inertia), I'd have a parallel axis theorem to help me.

Does something like a parallel axis theorem exist for plastic section modulus calcs? I've never seen something like this and I looked through my books already.

A reference to something like this would be greatly appreciated.
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[rb1957]

denial,
there is an approach for plastic bending of non-symmetric section in the MSFC Stress Analysis Manual (at

http://euler9.tripod.com/analysis/asm.html).

this also covers the more typical Cozzone analysis, which is a bit more complicated than swivel63's suggestion.

but i agree with swivel's final comment !

 

[haynewp]

rb1957, Can you give a direct link to an example of this "Cozzone" analysis of beams? I am having trouble finding "Cozzone" on the link you gave.

 

[haynewp]

Nevermind I found it. It looks like it is using the true stress strain curve instead of the engineering stress strain curve we normally use.