*HEADING
360 DEGREES MODEL CORRESPONDING TO 2X2 MESH OF S4R ELEMENTS
AND MODEL CHANGE STEPS
TEST 9-DIGIT LABELS
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*NODE
900000001,          -5.,           5.
900000002,         -15.,          15.
900000003,         -30.,           0.
900000004,         -10.,           0.
900000005,           0.,          10.
900000006,  1.77636E-15,          30.
900000007,         -25.,          25.
900000008,         -50.,           0.
900000009,           0.,          50.
900000010,         -15.,         -15.
900000011,         -25.,         -25.
900000012,           0.,         -50.
900000013,  1.77636E-15,         -30.
900000014,          -5.,          -5.
900000015,           0.,         -10.
900000016,          15.,         -15.
900000017,          25.,         -25.
900000018,          50.,           0.
900000019,          30.,  1.77636E-15
900000020,           5.,          -5.
900000021,          10.,           0.
900000022,          15.,          15.
900000023,          25.,          25.
900000024,           5.,           5.
*ELEMENT, TYPE=S4R
900000001,900000001,900000002,900000003,900000004
900000002,900000002,900000001,900000005,900000006
900000003,900000002,900000007,900000008,900000003
900000004,900000007,900000002,900000006,900000009
900000005,900000010,900000011,900000012,900000013
900000006,900000011,900000010,900000003,900000008
900000007,900000014,900000010,900000013,900000015
900000008,900000010,900000014,900000004,900000003
900000009,900000016,900000017,900000018,900000019
900000010,900000017,900000016,900000013,900000012
900000011,900000020,900000016,900000019,900000021
900000012,900000016,900000020,900000015,900000013
900000013,900000022,900000023,900000009,900000006
900000014,900000023,900000022,900000019,900000018
900000015,900000024,900000022,900000006,900000005
900000016,900000022,900000024,900000021,900000019
*ELSE, ELSET=EALL, GENERATE
900000001,900000016,1
*NSET, NSET=NBC
900000001,900000004,900000005,900000014,900000015,900000020,900000021,900000024
*SHELL SECTION, ELSET=EALL,MATERIAL=MAT
1., 
*MATERIAL,NAME=MAT
*ELASTIC
10E8,0.3
*DENSITY
100,
*BOUNDARY
NBC, 1,6, 0
**
*STEP
REMOVE ELEMENTS WITH MODEL CHANGE
*STATIC
0.1, 1.0
*MODEL CHANGE, TYPE=ELEMENT, REMOVE
900000016,900000002,900000008,900000012
*CLOAD
900000018, 1, 1E6
900000009, 2, 1E6
900000008, 1, -1E6
900000012, 2, -1E6
*OUTPUT, FIELD, FREQUENCY=0
*END STEP
**
*STEP
ADD THE ELEMENTS BACK
*STATIC
0.1, 1.0
*MODEL CHANGE, TYPE=ELEMENT, ADD
900000016,900000002,900000008,900000012
*END STEP
**
*STEP
PERFORM A FREQUENCY EXTRACTION
*FREQUENCY, EIGENSOLVER=LANCZOS, SIM=NO
14
*END STEP