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