Why won't the input below with COMBI214 converge or give correct answers?
/PREP7
ET,1,MASS21,0,0,2
R,1,1.0
ET,2,COMBI214 ! ELEMENT TYPE # 3: BEARING ELEMENT
KEYOPT,2,2,1 ! YZ PLANE
KEYOPT,2,3,0 ! ELEMENT IS SYMMETRIC
R,2,10,10,10.0,10.0,, ! REAL CONSTANTS ( K11,K22,K12,K21) NO DAMPING
/COM, NODES
N,1, 0.0, 0.0, 0.0
N,2, 0.0, 1.0, 0.0
N,3, 0.0, 0.0, 1.0
/COM, ELEMENTS
/COM, MASS
TYPE,1
REAL,1
E,1
/COM, BEARINGS
TYPE,2
REAL,2
E,2,1,3
ALLSEL,ALL
FINI
/SOLU
D,1,UZ
D,ALL,UX ! NO TRACTION
D,2,ALL ! SECOND NODES OF BEARING
D,3,ALL ! SECOND NODES OF BEARING
OUTPR,ALL,ALL
ANTYPE,TRANS !NONLINEAR TRANSIENT DYNAMIC ANALYSIS
!NLGEOM,ON ! LARGE DEFLECTION OPTION
NROPT,FULL
KUSE,-1
NEQIT = 30
TIME,1.0
F,1,FY,1.0
KBC,0
NSUBST,10,10,10
LSWRITE,1 ! WRITE LOAD STEP FILE 1
TIME,10.0
F,1,FY,0
KBC,1
NSUBST,90,90,90
LSWRITE,2 ! WRITE LOAD STEP FILE 2
FINISH
/SOLU
OUTRES,ALL,ALL
OUTPR,ALL,ALL
LSSOLVE,1,2,1 ! READ IN LOAD STEP FILES 1 and 2
FINISH
This is defect 63544. The problem was caused by node orientation. Typically, the i and k nodes are at a negative offset to the node on the centerline. In this model, they have a positive offset, and that was not accounted for correctly in the code. If nodes 2 and 3 are given a negative y and z location, the problem disappears. The defect has been fixed in 12.0. |
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