Tinni1
Civil/Environmental
- Sep 27, 2021
- 157
Hello,
I am performing the post-buckling analysis of a cold-formed steel stud and track assembly that are connected to each other by a self-tracking screw.
In Abaqus, I modeled the screw stiffness using the connector elements. I have defined reference points on the stud and track surface, in the screw locations and connected these points with wire elements following that I have applied the screw stiffness. These reference points may not coincide with the corner nodes of the meshes in the stud and tracks (Based on available literature this is OK and we need not connect the connector elements with the nodes).
While running the analysis, I got the below warning:
*WARNING: AT LEAST ONE OF THE NODES OF CONNECTOR ELEMENT 1 (ASSEMBLY) DOES
NOT HAVE ANY MASS ASSOCIATED WITH IT. THIS COULD LEAD TO AN EQUATION
SOLVER ISSUES (ZERO PIVOTS, NUMERICAL SINGULARITIES, etc.) AND
HENCE TO INCORRECT SOLUTIONS WHEN THE CONNECTOR ELEMENT IS
ENFORCING KINEMATIC CONSTRAINTS (FROM EITHER INTRINSIC, CONNECTOR
STOP/LOCK, or CONNECTOR MOTION). PLEASE ATTACH THE CONNECTOR NODES
TO ELEMENTS FOR WHICH MASS IS DEFINED (SUCH AS ELEMENTS TYPE MASS
WITH A SMALL MASS) TO RESOLVE THE PROBLEM.
Could you please advise, if I need to connect the wire elements with the corner nodes of the meshes, to resolve this warning?
I am performing the post-buckling analysis of a cold-formed steel stud and track assembly that are connected to each other by a self-tracking screw.
In Abaqus, I modeled the screw stiffness using the connector elements. I have defined reference points on the stud and track surface, in the screw locations and connected these points with wire elements following that I have applied the screw stiffness. These reference points may not coincide with the corner nodes of the meshes in the stud and tracks (Based on available literature this is OK and we need not connect the connector elements with the nodes).
While running the analysis, I got the below warning:
*WARNING: AT LEAST ONE OF THE NODES OF CONNECTOR ELEMENT 1 (ASSEMBLY) DOES
NOT HAVE ANY MASS ASSOCIATED WITH IT. THIS COULD LEAD TO AN EQUATION
SOLVER ISSUES (ZERO PIVOTS, NUMERICAL SINGULARITIES, etc.) AND
HENCE TO INCORRECT SOLUTIONS WHEN THE CONNECTOR ELEMENT IS
ENFORCING KINEMATIC CONSTRAINTS (FROM EITHER INTRINSIC, CONNECTOR
STOP/LOCK, or CONNECTOR MOTION). PLEASE ATTACH THE CONNECTOR NODES
TO ELEMENTS FOR WHICH MASS IS DEFINED (SUCH AS ELEMENTS TYPE MASS
WITH A SMALL MASS) TO RESOLVE THE PROBLEM.
Could you please advise, if I need to connect the wire elements with the corner nodes of the meshes, to resolve this warning?