# Maximum Equivalent Stress In ANSYS Mechanical(Illustrated Expression)

This is an solution option for mechanical problems in ANSYS Mechanical. In here, we explain what is the Maximum Equivalent Stress theory basically, and how to see Max. Equivalent Stress in ANSYS Mechanical.

### What Is Maximum Equivalent Stress Theory?

Maximum Equivalent Stress theory has a very basic logic. Mx. Equivalent Stress theory, also called as distorsion energy theory or von-Mises theory, states that, maximum equivalent stress at a stress elements on a material or part, must be smaller from yield strength of that used material.

Maximum equivalent stress theory is applicable to ductile materials. These ductile materials can be aluminum, brass or steel.

### How To Calculate Maximum Equivalent Stress In ANSYS Mechanical?

ANSYS Mechanical provides a solution option called as ‘Max. Equivalent Stress’. You can select this option for static problems such as ‘Static Structural’ in ANSYS Mechanical.

For example, you defined all of your boundry conditions for your problem in ANSYS Mechanical like above. To see ‘Max. Equivalent Stress’, right click on ‘Solution’ then hover your mouse on ‘Insert’ option, then do the same thing for ‘Stress Tool’ as shown by red arrows above. Then select ‘Max. Equivalent Stress’ as shown in red box above in ANSYS Mechanical.

There are three options for ‘Stress Tool’ in ANSYS Mechanical. All of these tools means nearly same thing but, you can see the formulae of these three tool. Then you can select yourself one of them as above.

Slimit = Maximum yield strength

Fs: Factor Of Safety

Ms: Safety MArgin

SigmaE: Equivalent stress

If there are some kinds of stress amplifiers in your design or parts; consider appropriate stress concentration factors Kt. In in most ductile materials, stress concentration zones are not prominent. Failure generally occurs at all cross-sectional area.

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