Will zero displacement boundary condition affect the possion ratio?

- December 16, 2019 at 12:38 pm
  
  bolbol
  Subscriber
  
  Hello,
  
  My following question regarding the theory behind the displacement boundary condition.
  
  The following bar under:
  
  - Applied force F in the z-direction on one of its ends.
  
  - The other end is fixed.
  
  - Applying displacement condition on the 4 yellow faces (2 of them is visible in the picture) with x=0,y=0, z=free.
  
  And we know from Poisson's ratio that increasing the deformation in z-direction will lead to decreasing in the x and y-direction.
  
  So, will my displacement condition which applied on the yellow faces violate the Poisson's ration?
- December 17, 2019 at 12:22 am
  
  peteroznewman
  Subscriber
  
  Poisson's Ratio is the ratio of strain in the transverse direction divided by strain in the axial direction, when there is no constraint on lateral strain. When that is the case, there is no stress in the transverse direction.
  
  If you make a constraint preventing transverse strain, then a transverse tensile stress will develop.
  
  Why are you asking here, why don't you just build the two models and look at the results?

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