*HEADING : Membrane patch test [S4] *PREPRINT,ECHO=NO *RESTART,WRITE *NODE,NSET=ALL 10,0,0 20,.24,0. 30,.24,.12 40,0.,.12 102,.04,.02 104,.18,.03 204,.16,.08 202,.08,.08 *NSET,NSET=SIDES,GENERATE 10,40,10 *ELEMENT,TYPE=S4, ELSET=EALL 1,10,20,104,102 2,10,102,202,40 3,102,104,204,202 4,104,20,30,204 5,202,204,30,40 *ELSET,ELSET=EL3 3, *SHELL SECTION,MATERIAL=A1, ELSET=EALL 0.0125,5 *MATERIAL,NAME=A1 *ELASTIC,TYPE=ISOTROPIC 1.E6,.25 *DENSITY 1.0, ** ** Step 1: General Step ** *STEP *STATIC 0.25,1.0 *BOUNDARY 10,1,2 ALL,3,5 20,1,,.24E-3 20,2,,.12E-3 30,1,,.3E-3 30,2,,.24E-3 40,1,,.06E-3 40,2,,.12E-3 *EL FILE,ELSET=EL3,POS=NODES,FREQ=999 S, E, *EL PRINT,ELSET=EL3,FREQ=999 S, E, *NODE PRINT,FREQ=999 U, RF, *NODE FILE,FREQ=2 U, *END STEP ** ** Step 2: General Step ** *STEP *STATIC 0.25,1.0 *BOUNDARY 10,1,2 ALL,3,5 20,1,,.48E-3 20,2,,.24E-3 30,1,,.6E-3 30,2,,.48E-3 40,1,,.12E-3 40,2,,.24E-3 *END STEP ** ** Step 3: Perturbation Step ** *STEP,PERTURBATION *STATIC *BOUNDARY 10,1,2 ALL,3,5 20,1,,.24E-3 20,2,,.12E-3 30,1,,.3E-3 30,2,,.24E-3 40,1,,.06E-3 40,2,,.12E-3 *EL FILE,ELSET=EL3,POS=NODES,FREQ=999 S, E, *EL PRINT,ELSET=EL3,FREQ=999 S, E, *NODE PRINT,FREQ=999 U, RF, *NODE FILE,FREQ=2 U, *END STEP ** ** Step 4: Steady State Dynamics ** *STEP *STEADY STATE DYNAMICS,DIRECT 10.0, *BOUNDARY 10,1,2 ALL,3,5 20,1,,.24E-3 20,2,,.12E-3 30,1,,.3E-3 30,2,,.24E-3 40,1,,.06E-3 40,2,,.12E-3 *EL FILE,ELSET=EL3,POS=NODES,FREQ=999 S, E, *EL PRINT,ELSET=EL3,FREQ=999 S, E, *NODE PRINT,FREQ=999 U, RF, *NODE FILE,FREQ=2 U,RF,PU *END STEP