Learning Forum

[pavan kumar]

Hello,

 I am doing cyclic symmerty simulation in static structural 

here is the symmerty model

and i defined the frictional contact of 0.06 coefficient friction 

here is the contact information

 

here is the analysis settings of step 1

here is the analysis settings of step 2

and here is image shows the loading condition 

 

and boundary condition is shown here 

 

but still im getting this error

Element 258486 (type = 4, SOLID187) (and maybe other elements) has become highly distorted. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). You may need to improve your mesh to obtain elements with better aspect ratios. Also consider the behavior of materials, contact pairs, and/or constraint equations. Please rule out other root causes of this failure before attempting rezoning or nonlinear adaptive solutions. If this message appears in the first iteration of first substep, be sure to perform element shape checking.

 

 

i dont no how to solve this problem 

i changed element size also and i changed time step also and i changed number of substeps also but still model is not converging 

 

can anyone please help me to solve this 

 

[dlooman]

For such a thin model the elements at the centerline are going to be poorly shaped.  Also, in a 3D model, an edge is a singularity.  It has no cross-sectional area so the stresses go to infinity.   In a 3D model the fixed edge cannot resist rotation so a tangential constraint should be specified somewhere in the model.  It would be better modeling practice to create a small axial hole at the center of the model and fix the face of the hole.  That would address all three issues.