It doesn’t seem to behave that way. Here’s an example where the result is correct at the first and last increment of a step but, in the middle, it behaves as if the contact stiffness is reduced.
Inp file:
*NODE
1,0,0,0
2,1,0,0
3,1,1,0
4,0,1,0
5,0,0,1
6,1,0,1
7,1,1,1
8,0,1,1
9,0,1,0
10,1,1,0
11,1,2,0
12,0,2,0
13,0,1,1
14,1,1,1
15,1,2,1
16,0,2,1
*ELEMENT,TYPE=C3D8,ELSET=Default
1,1,2,3,4,5,6,7,8
2,9,10,11,12,13,14,15,16
*MATERIAL,NAME=Material
*ELASTIC,TYPE=ISOTROPIC
200000000000,0
*SOLID SECTION,ELSET=Default,MATERIAL=Material
*BOUNDARY
1,1,3,0
2,1,3,0
5,1,3,0
6,1,3,0
11,1,,0
11,3,,0
12,1,,0
12,3,,0
15,1,,0
15,3,,0
16,1,,0
16,3,,0
*SURFACE,NAME=contact_faces(2)
2,S3
*SURFACE,NAME=contact_faces
1,S5
*CONTACT PAIR,INTERACTION=SI_1,TYPE=SURFACE TO SURFACE
contact_faces(2),contact_faces
*SURFACE INTERACTION,NAME=SI_1
*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR
100000
*STEP,NLGEOM=YES,AMPLITUDE=STEP
*STATIC,DIRECT
0.5,2
*CLOAD
11,2,-2500
12,2,-2500
15,2,-2500
16,2,-2500
*NODE FILE
U
*END STEP
Solution:
Time, displacement in y at node 9:
0.5, -0.1 (correct)
1.0, -0.167
1.5, -0.183
2.0, -0.1 (correct)