An elliptical thick plate is subjected to a normal pressure on the top face. Differences between constant stress solid (elform 1), fully integrated S/R solid (elforms 2 and -1) and 8 point enhanced strain solid (elform 18) can be studied. Example 3 from Introductory Manual for LS-DYNA Users by James M. Kennedy.
*CONTROL_IMPLICIT_GENERAL *CONTROL_IMPLICIT_SOLUTION *CONTROL_IMPLICIT_SOLVER *CONTROL_TERMINATION *DATABASE_BINARY_D3PLOT *DATABASE_ELOUT *DATABASE_EXTENT_BINARY *DATABASE_HISTORY_SOLID *DEFINE_CURVE *ELEMENT_SOLID *END *KEYWORD *LOAD_SEGMENT *MAT_ELASTIC *NODE *PART *SECTION_SOLID *TITLE
*KEYWORD
*TITLE
Elliptical Thick Plate under Normal Pressure (coarse mesh)
*CONTROL_IMPLICIT_GENERAL
1 0.100000 2 1 2
*CONTROL_IMPLICIT_SOLUTION
1 11 15 0.001000 0.010000 1.00e+10 0.900000 1.00e-10
*CONTROL_IMPLICIT_SOLVER
4 2 2 0 1 0.0 1 0.0
2
*CONTROL_TERMINATION
1.000000 0 0.0 0.0 0.0
*DATABASE_ELOUT
1.0000E-9 0 0
*DATABASE_BINARY_D3PLOT
1.000000
*DATABASE_EXTENT_BINARY
8 1.0 stress stress
*DATABASE_HISTORY_SOLID
1 5 9 13
*DEFINE_CURVE
1 0 0.0 0.0 0.0 0.0
0.0 0.0
1.00000000 1.0000000e+06
*ELEMENT_SOLID
*NODE
*PART
1 1 1
*SECTION_SOLID
1 1 1
*MAT_ELASTIC
1 7800.0002.1000e+11 0.300000 0.0 0.0 0.0
*LOAD_SEGMENT
1 1.000000 0.0 29 35 37 31
1 1.000000 0.0 31 37 39 33
1 1.000000 0.0 35 41 43 37
1 1.000000 0.0 37 43 45 39
1 1.000000 0.0 33 39 69 65
1 1.000000 0.0 65 69 71 67
1 1.000000 0.0 39 45 73 69
1 1.000000 0.0 69 73 75 71
1 1.000000 0.0 67 71 99 95
1 1.000000 0.0 95 99 101 97
1 1.000000 0.0 71 75 103 99
1 1.000000 0.0 99 103 105 101
1 1.000000 0.0 41 125 127 43
1 1.000000 0.0 43 127 129 45
1 1.000000 0.0 125 131 133 127
1 1.000000 0.0 127 133 135 129
1 1.000000 0.0 45 129 149 73
1 1.000000 0.0 73 149 151 75
1 1.000000 0.0 129 135 153 149
1 1.000000 0.0 149 153 155 151
1 1.000000 0.0 75 151 169 103
1 1.000000 0.0 103 169 171 105
1 1.000000 0.0 151 155 173 169
1 1.000000 0.0 169 173 175 171
*END
