2D analysis. CQPSTN element & CONTACT. Node numbering. FATAL

David_R

I get FATAL

.out messages mention CQPSTN element node numbering, renumbering, & likely related problem with CONTACT there.

.out suggests to re-import the model, export etc will fix this … but it is not resolved.

.out describes element normals need to be positive. … but it is not resolved.

My model is on the XZ plane.

QUESTION: How can I fix my model?

.out message pasted here:

*** WARNING # 2502
Element 427 had incorrect node numbering sequence and needs renumbering.

....more messages about the elements with incorrect node sequence suppressed.
Note : Please import the model into HyperMesh and export it. This will fix
the problem related to the incorrect node numbering.

*** WARNING # 2501
13560 elements had incorrect node numbering sequence and had their nodes
renumbered. This will affect the orientation of respective element
coordinate systems. If there is any CONTACT/TIE defined on these elements,
an error will be triggered.

*** WARNING # 6571
For CQAXI, CTAXI, CQPSTN, CTPSTN, CQPSTS, CTPSTS and CTRIAX6 elements, the
out-of-plane normal direction defined by the corner node sequence with the
right-hand rule should point to the positive z direction if the element is
in the x-y plane, and, the positive y direction if it is in the x-z plane.

David_R

So,

I adjusted the element normals

so as the element face facing +y direction appears blue: negative ….

then it ran and solved ok.

In comparison to the .out FATAL message suggestion to +y direction & right hand thumb rule.

Rajashri_Saha

Good to know that you are able to correct the error.

You can refer the below document for more information on this type of analysis.

How to Setup a Plane Strain Analysis in OptiStruct — Altair Community