Use of Maximum principal stress and von Mises Stress

[mj345]

Hello All,

Thank you everyone for your time and help.
May I know when should I use von Mises and maximum principal stress while reporting FEA results.

Kind regards,

 

[FEA way]

It depends on the failure theory and thus the type of material that you use. Mises criterion is generally used in case of ductile metals while max principal stress criterion applies to brittle materials.

 

[SWComposites]

Please review your strength of materials text.