Hello Abaqus Community,

I am currently conducting a study using Abaqus Explicit to examine the behavior of contact surfaces under varying friction conditions, specifically focusing on wave propagation as contact conditions evolve. My model utilizes a 2D formulation with CPS4R elements.

To analyze the results at contact surfaces, I have defined two paths and am attempting to plot curves using "XY Data from Path". Interestingly, there is a noticeable difference between the curves when comparing "Deformed" vs. "Undeformed" model shapes, despite having specified "nlgeom=NO". The curve from the "Deformed" model shape appears linear, whereas the "Undeformed" option shows excessive oscillations, which I suspect may be more related to data processing issues rather than physical phenomena.

Attached are two figures illustrating these observations. I would appreciate any insights or recommendations on how to address these discrepancies and improve the accuracy of my data interpretation.

Thank you in advance for your assistance.

Best regards,

My step looks like:

** PREDEFINED FIELDS
** 
** Name: Predefined Field-1   Type: Stress
*Initial Conditions, type=STRESS, file=ImplicitPreload.odb, step=3, inc=19
**  
** STEP: Step-4
** 
*AMPLITUDE, NAME=AMPB
0.0,0.0,5e-4,-1.E-3
*Step, name=Step-4, nlgeom=NO
*Dynamic, Explicit, FIXED TIME INCREMENTATION
, 1.e-3
** ----------------------------------------------------------------
*Surface Interaction, name=IntProp-1
*Friction, exponentialdecay
0.9, 0.01, 5.46
*Surface Behavior, pressure-overclosure=HARD
** Interaction: Int-1
*Contact Pair, interaction=IntProp-1
BOT-1.BOT_TOP, TOP-1.TOP_BOT
** 
*Boundary, amplitude=AMPB
BOT-1.BOT_PUSH, 1, 1, 1.0
** Bulk Viscosity
*Bulk Viscosity
0.06, 1.2
** 
** Output Requests
*Output, field,frequency=50
*Contact Output,variable=all
** 
*Element Output, variable=ALL
*Node Output, variable=ALL
** 
*Output, history, variable=all,frequency=50
** 
** 
*End Step