*HEADING STATIC INDENTATION OF ELASTOMERIC FOAM WITH A HEMISPHERICAL PUNCH AND CAX4 elements ******************************************************** ** Measure the punch reaction force during the following 2 steps: ** Step 1: Displace punch 200 mm downwards. ** Step 2: ALE ** Step 2: Displace punch 50mm further down. ** (Units: N, mm, sec) ******************************************************** *PREPRINT,MODEL=YES,HISTORY=NO *RESTART,WRITE *NODE 1, 0., 300. 19, 0., 0. 481, 300., 300. 499, 300., 0. 601, 600., 300. 619, 600., 0. *NSET,NSET=N1 1, *NSET,NSET=N19 19, *NSET,NSET=N481 481, *NSET,NSET=N499 499, *NFILL,NSET=TOP,BIAS=.85 N1,N481,12,40 *NGEN,NSET=TOP 481,601,40 *NFILL,NSET=BOT,BIAS=.85 N19,N499,12,40 *NGEN,NSET=BOT 499,619,40 *NFILL,NSET=ALLN,BIAS=.9 TOP,BOT,9,2 *NSET,NSET=CENTER,GENERATE 1,19 *ELEMENT,TYPE=CAX4H 1,3,43,41,1 *ELGEN,ELSET=FOAM 1,15,40,10,9,2,1 *ELSET,ELSET=CENT,GENERATE 1,141,10 61,69 *ELSET,ELSET=ETOP,GENERATE 1,101,10 *ELSET,ELSET=UPPER,GEN 1,141,10 *NODE,NSET=PUNCH 1000,0.,510. *SOLID SECTION,ELSET=FOAM,MATERIAL=HYPER *MATERIAL, NAME=HYPER *HYPERELASTIC 80.0, 20.0 *BOUNDARY BOT,1,2 CENTER,1 1000,1 1000,6 **************************************************** *SURFACE,TYPE=SEGMENTS,NAME=IMPACTOR START,141.42,641.42 CIRCL,-1.,300.,0.,500. *SURFACE,TYPE=ELEMENT,NAME=TARGET ETOP,S3 *RIGID BODY,REF NODE=1000,ANALYTICAL SURFACE=IMPACTOR *CONTACT PAIR,INTERACTION=ROUGH TARGET,IMPACTOR *SURFACE INTERACTION, NAME=ROUGH **************************************************** *STEP,NLGEOM,INC=200,AMPLITUDE=RAMP Displace punch 200 mm downwards. *STATIC .0015,1.,,.05 *BOUNDARY 1000,2,2,-200. *PRINT,CONTACT=YES *CONTACT CONTROLS,FRICTION ONSET=DELAY *CONTACT PRINT,SLAVE=TARGET **CONTACT FILE,SLAVE=TARGET,FREQUENCY=10 *ENERGY PRINT,FREQUENCY=5 *ENERGY PRINT,ELSET=FOAM,FREQ=5 *ENERGY PRINT,ELSET=CENT,FREQ=5 *EL PRINT,FREQUENCY=50,ELSET=CENT S, E, *NODE PRINT,FREQUENCY=25 U, RF, *OUTPUT,FIELD,FREQUENCY=4 *NODE OUTPUT U,V,A,RF *ELEMENT OUTPUT S,LE,NE *CONTACT OUTPUT,VARIABLE=PRESELECT,NSET=TOP *OUTPUT,HISTORY,FREQUENCY=1 *NODE OUTPUT,NSET=PUNCH U,V,A,RF *ELEMENT OUTPUT,ELSET=CENT S,LE,NE *ENERGY OUTPUT,VARIABLE=PRESELECT *Adaptive Mesh, Elset=Foam, Frequency=1, Mesh Sweeps=10 *END STEP