Negative Jacobian values at 1 integration points error

- June 2, 2020 at 12:55 pm
  
  jordi.marce.nogue
  Subscriber
  
  I am solving a mesh in a elastic and static structural problem. Really simple with a fixed boundary condition and one force to avoid other possible consequences and I got this error in the solver output:
  
  *** ERROR *** CP = 33.172 TIME= 15:18:19
  Element 567422 has negative Jacobian values at 1 integration points and
  the ratio of the part represented by the integration points to the
  element volume reaches 3.357162844E-02, which is larger than the limit
  of 1.E-02. Please modify the mesh before solving again.
  
  I tried to modify the mesh but I am not capable to solve it and I am not capable to understand where the problem should be.
  
  Any help will be useful. Thanks!
- June 2, 2020 at 2:28 pm
  
  Sai Deogekar
  Ansys Employee
  
  Hi,
  
  Could you try increasing the stiffness of the material assigned to the body? At least for larger strains? This issue tends to occur when the material is very soft and hence undergoes such a large deformation that some elements distort excessively (leading to negative Jacobian).
  
  Sai
- June 2, 2020 at 3:40 pm
  
  jordi.marce.nogue
  Subscriber
  
  Hi Sai,
  
  I tried to change the stiffness of the material and tried to solve the model in large deflections but it did not work. Surprisingly, I changed the type of element to linear (instead of the quadratic by default) and I solved it without errors. I don't know why, but it works
  
  j
- June 3, 2020 at 3:13 pm
  
  Sai Deogekar
  Ansys Employee
  
  Thank you for taking the time to post the solution on the forum!