kamcio326
Mechanical
- Jan 17, 2016
- 4
Hi!
Currently i'm performing bracket analysis, which is connected to ring with bolt joints. In 1st step of analysis I' am applying bolts preload and at the 2nd concentrated force to bracket via coupling constraint.
I noticed that this steps separately (2nd step with coupling constraints in place of bolts) resolve correctly but if i submit them both Abaqus has convergence problems during resolving second step. I've tried automatic stabilization, contact controls and nothing helps.
Please help
Warnings:
Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.
THE SLAVE SURFACES ASSEMBLY_CP-139-BRACKET-1 AND ASSEMBLY_CP-140-BRACKET-1 INTERSECT EACH OTHER. THEY ARE PAIRED WITH MASTER SURFACES ASSEMBLY_CP-1-RING-1 AND ASSEMBLY_CP-2-RING-1 THAT ALSO INTERSECT EACH OTHER. IF BOTH PAIRS ARE *CONTACT PAIRs, THESE TWO PAIRS SHOULD NOT BE SIMULTANEOUSLY PRESENT IN A STEP BECAUSE OF POSSIBLE CONVERGENCE PROBLEMS; USE *MODEL CHANGE,TYPE=CONTACT PAIR TO REMOVE ONE OF THEM. IF BOTH ARE *TIE PAIRS, THE REDUNDANT TIES WILL BE REMOVED AUTOMATICALLY. IF ONE PAIR IS *TIE AND ANOTHER IS *CONTACT PAIR, REMOVE ONE OF THEM.
MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM
5193 elements are distorted. Either the isoparametric angles are out of the suggested limits or the triangular or tetrahedral quality measure is bad. The elements have been identified in element set WarnElemDistorted.
Excessive distortion at a total of 252 integration points in solid (continuum) elements
Excessive distortion at a total of 18 integration points in solid (continuum) elements
Currently i'm performing bracket analysis, which is connected to ring with bolt joints. In 1st step of analysis I' am applying bolts preload and at the 2nd concentrated force to bracket via coupling constraint.
I noticed that this steps separately (2nd step with coupling constraints in place of bolts) resolve correctly but if i submit them both Abaqus has convergence problems during resolving second step. I've tried automatic stabilization, contact controls and nothing helps.
Please help
Warnings:
Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.
THE SLAVE SURFACES ASSEMBLY_CP-139-BRACKET-1 AND ASSEMBLY_CP-140-BRACKET-1 INTERSECT EACH OTHER. THEY ARE PAIRED WITH MASTER SURFACES ASSEMBLY_CP-1-RING-1 AND ASSEMBLY_CP-2-RING-1 THAT ALSO INTERSECT EACH OTHER. IF BOTH PAIRS ARE *CONTACT PAIRs, THESE TWO PAIRS SHOULD NOT BE SIMULTANEOUSLY PRESENT IN A STEP BECAUSE OF POSSIBLE CONVERGENCE PROBLEMS; USE *MODEL CHANGE,TYPE=CONTACT PAIR TO REMOVE ONE OF THEM. IF BOTH ARE *TIE PAIRS, THE REDUNDANT TIES WILL BE REMOVED AUTOMATICALLY. IF ONE PAIR IS *TIE AND ANOTHER IS *CONTACT PAIR, REMOVE ONE OF THEM.
MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM
5193 elements are distorted. Either the isoparametric angles are out of the suggested limits or the triangular or tetrahedral quality measure is bad. The elements have been identified in element set WarnElemDistorted.
Excessive distortion at a total of 252 integration points in solid (continuum) elements
Excessive distortion at a total of 18 integration points in solid (continuum) elements