What does Stress Stiffening means and why does it happen if Large Deflection = ON?

- September 17, 2021 at 12:36 pm
  
  Rameez_ul_Haq
  Subscriber
  
  While making a geometric non-linear static structural analysis by putting Large Deflection = ON, in the solver output file it was written that Stress Stiffening = ON. I couldn't understand the basic concept of stress stiffening and why does it happen when Large Deflection is ON? Is this an important aspect in a non-linear analysis and is always important to consider?
- September 17, 2021 at 2:10 pm
  
  Sahil Sura
  Ansys Employee
  
  Stress stiffening effect usually needs to be considered for thin structures with bending stiffness very small compared to axial stiffness .You may refer to the following documentation for the theory of stress stiffening. For the theory, governing equations of Large deformation, please refer to the following reference along with course.
  3.4. Stress Stiffening (ansys.com)
  3.2. Large Strain (ansys.com)
  Large Deformation | Ansys Innovation Courses
  Thanks Sahil.