** Mass scaling verification: *VARIABLE MASS SCALING with 2-d contact
**
*HEADING
*RESTART,WRITE	
*NODE,NSET=NALL
1,   0.0, 0.0
2,   3.0, 0.0
3,   6.0, 0.0
11,   0.0, 4.0
12,   3.0, 4.0
13,   6.0, 4.0
21,  2.0, 4.1
22,  5.0, 4.1
31,  2.0, 8.0
32,  5.0, 8.0
*NSET,NSET=RIGHT
2, 3
*NSET,NSET=FIXED
1, 
*NSET,NSET=SLIDER
31,32
*ELEMENT,TYPE=CPE4R,ELSET=NOSCALE
1, 1, 2,12,11
2, 2, 3,13,12
3,21,22,32,31
*ELSET,ELSET=EALL
NOSCALE,
*ELSET,ELSET=BOT
1,2
*ELSET,ELSET=TOP
3, 
*SOLID SECTION,ELSET=NOSCALE,MATERIAL=NOSCALE
.5, 
*MATERIAL,NAME=NOSCALE
*ELASTIC
1.E6, .25
*DENSITY
1.E-4, 
*BOUNDARY
FIXED, 1, 2
RIGHT, 2, 2
*AMPLITUDE,NAME=SMOOTH,DEFINITION=SMOOTH STEP
0.,0.,  .002, 1.
*SURFACE,TYPE=ELEMENT,NAME=TOP
TOP, 
*SURFACE,TYPE=ELEMENT,NAME=BOT
BOT,
**
*NSET, NSET=QA_TEST_ALLNODES
NALL, RIGHT, FIXED, SLIDER
**
*STEP
*DYNAMIC,EXPLICIT
,.002
*VARIABLE MASS SCALING, DT=2.891E-5, TYPE=UNIFORM, NUMBER INTERVAL=5
*CONTACT PAIR
BOT,TOP
*BOUNDARY,AMP=SMOOTH
SLIDER, 2, 2, -0.2
*RESTART,WRITE,NUMBER INTERVAL=2
*FILE OUTPUT,NUMBER INTERVAL=4,TIMEMARKS=YES
*NODE FILE
U,
***EL FILE
**EMSF, EDT
***OUTPUT,HISTORY,TIME INTERVAL=0.
***NODE OUTPUT,NSET=FIXED
**RF,
*OUTPUT, FIELD, NUMBER INTERVAL=4, TIMEMARKS=YES
*NODE OUTPUT, NSET=QA_TEST_ALLNODES
U,
*OUTPUT,FIELD,VARIABLE=PRESELECT
*OUTPUT,HISTORY,VARIABLE=PRESELECT,TIMEINT=0.0005
*END STEP