*HEADING
 NAFEMS BENCHMARK EXAMPLE 3DNLG-7, ELEMENT S3
 LARGE DEFLECTION ELASTIC RESPONSE OF A HINGED SPHERICAL SHELL UNDER UNIFORM
 PRESSURE LOADING
*NODE,NSET=ALL
*Element, type=S3, elset=all
*Nset, nset=set1
*Nset, nset=set2
*Nset, nset=set3
*Nset, nset=set4
*SHELL SECTION,ELSET=ALL,MAT=MAT
100,
*NSET, NSET=EDGE
set1, set2, set3, set4
*NSET,NSET=CENTRE
*MATERIAL,NAME=MAT
*ELASTIC
69.0,0.3
*BOUNDARY
EDGE,1,3
*RESTART,WRITE,FREQ=999
*STEP,INC=100,NLGEOM
 UNIFORM PRESSURE LOADING - RIKS
*STATIC,RIKS
0.1,1.0,,0.2,1.0
*DLOAD
ALL,P,-0.1
*EL PRINT,FRE=1
LOADS,
*NODE PRINT,FRE=1,NSET=CENTRE
U3,
*EL FILE,FRE=1
LOADS,
*OUTPUT,FIELD,FREQ=1
*ELEMENT OUTPUT
LOADS,
*NODE FILE,FRE=1,NSET=CENTRE
U,
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT,NSET=CENTRE
U,
*END STEP