Von Mises stresses and Maximum stresses

Question:

Hello

I am currently working on a small bridge project and in connection with that i am doing some detailed stress calculaitons.

In the litterature available for me, the Von Mises stress is the combination of normalstress in the x- and y-direction, AND the maximum shearstress. When i do some minor checks of the stresses found in my model it seems as if MIDAS does not take the shear stress in calculation in the Von Mises stress? Can that be true?

And if so, does that mean, that the "Sig-max" actually in the total Von Mises, where the maximum shear is taken into account?


Best regards 


Answer:

Hi,

Could you please provide us with more information about your checks? Your hand calculation and screen capture of program results. Thanks.

Regards,
DK Lee


I can:

The von mises check is calculated as: sqrt(sig_x^2+sig_y^2-sig_x*sig_y-3*tau_max)


You can see som edetalis in the PDF document.


How does Midas calculate the Von Mises stress??


Regard



Hi,

I think that your formula is not correct. In your formula, tau_max is included. It should be just tau. Please refer to the formulae below.

Regards,
DK Lee
Creation date: 8/2/2018 12:22 PM (dklee@midasit.com)      Updated: 8/2/2018 9:53 PM (dklee@midasit.com)
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