Learning Forum

[jordimarce]

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!

 

[SaiD]

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

[jordimarce]

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

[SaiD]

Thank you for taking the time to post the solution on the forum!