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Could any one explain me, what is the diff between maximum principal stress and normal stress ?

- October 26, 2020 at 7:01 am
  
  HarsihilZLHZ
  Subscriber
  
  In ansys, it shows max principal stress(sigma_11) and normal stress , aren't they both same?n
- October 26, 2020 at 3:49 pm
  
  Kai
  Ansys Employee
  
  Hi, principal stress and normal stress are different. They are only the same in certain conditions such as simple tension. You may google principal stress to find out more details on how principal stress is calculated.n
- October 27, 2020 at 4:14 am
  
  HarsihilZLHZ
  Subscriber
  
  In cauchy stress tensor, sigma_11,sigma_22,sigma_33 are the principal stress and sigma_12,sigma_13,sigma_21,sigma_23,sigma_31,sigma_32 are the shear stress is correct ?nI am confused between Principal stress and Normal stress (shows in Workbench)nAny link or formulation can anyone share?.
- October 28, 2020 at 3:50 pm
  
  Kai
  Ansys Employee
  
  sigma11, sigma22, sigma33 are normal stress, they are calculated in global coordinate system. They are only equal to principal stress if you do coordinate transformation so that shear stress are zero in the stress tensor. As Ansys employee, I'm not allowed paste any third party link here, but you can find how to transform by googling stress tensor to principal stressn
- October 28, 2020 at 3:56 pm
  
  Kai
  Ansys Employee
  
  This course will help. /courses/index.php/courses/stress-and-local-equilibrium/n
- October 29, 2020 at 5:45 am
  
  HarsihilZLHZ
  Subscriber
  
  got itnThanks Kai.n

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