Dear community, i need to ask you about my simulation in ANSYS APDL.
I'm trying to simulate a wheel rolling over a rail using the ANSYS APDL. In my simulation I considered only a piece of wheel and rail belonging to the contact region.
The rail piece is fixed at its bottom face (A200) while the upper face of the wheel piece was rigidely connected to a pilot node (refered by Node number+1) defined at the wheel center to apply boundary conditions to the wheel like force and displacement constraints.
In my simulation, I defined two steps:
- In The first step, a vertical load is applied to the pilot node and the wheel move only in the vertical direction (z direction) under load effect.
- In the second step, the wheel keep charged by the load and start rolling along the rail longitudinal direction (x direction).
To apply this procedure in ansys apdl I used the transient structural analysis and the following Apdl commands:
!----------------------------
/SOLU
ANTYPE,4
TRNOPT,FULL,,Damp
RESCONTROL,,NONE,None
Lumpm,0
!step1 charging a static wheel
Time,.001
DELTIM,.0005
TINTP,,0.25,0.5,0.5
KBC,1
TIMINT,off
outers,all,all
asel,s,area,,200
da,all,all! fixed support at rail bottom
D,nodenumber+1,,,,,,ux,uy,rotx,roty,rotz! displacement constraints applied to a pilot node located at wheel center !wheel can move in vertical direction only (z direction) at this step
f,nodenumber+1,fz,-75000 !the vertical load is applied at the pilot node
allsel,all
solve
!step2 moving the wheel in longitudinal direction (x direction)
Time,.019!time required by the wheel (diameter=460mm) to travel the entire rail length (length=250mm)
DELTIM,7.2e-5! the selected time step size is equal to the time required to cross one element of the rail contact surface (element size=1mm*1mm)
autots,on
TIMINT,on
outers,all,all
ddele,nodenumber+1,all
D,nodenumber+1,,,,,,ux,rotx,rotz,,,!wheel moves in z and x direction and also rotates around y axis in this step
D,nodenumber+1,,250e-3,,,,ux,,,,,
D,nodenumber+1,,0.54347826086957,,,,roty,,,,,
allsel,all
solve
finish
!----------------------------
My problem is when i run this script the simulation stay only iterating in the first substep of the step2 as you can see in the picture.
Please if can you tell me where is the issue here? 🙏🏻🙏🏻🙏🏻
Thank you so much for your help🙏🏻🙏🏻,
Best regards,
These commands need to be inserted directly under each desired contact region so that they will be located in the appropriate place in the solver batch input file at solution time. The next command snippet needed is the one that selects the desired contact and target elements and then employs the ANSYS Mechanical APDL command to end it
Dear sir @Ajibike Joan Farounbi really thank you so much for your important answer thank you. Definitely, when I got results it seems that in step 1 the program detect contact between wheel and the rail while in step 2 program don't detect any contact and the wheel continue traveling in vertical direction as there is no rail. Please sir @Ajibike Joan Farounbi if you can show me how can I apply your solution in Apdl?