I made a piping model in ANSYS APDL, where I tried to input the gravity load with ACEL command. However, analysis results became implausible, where the stress was 1100 MPa, and when I did not input the ACEL command, the stress was around 90-110 MPa. I can ensure all units are correct. Do you have any idea how to solve this problem?
Dear Muhamad,
Make sure you are applying the acceleration in correct direction. The APDL Reference tells:
"Thus, to simulate gravity (by using inertial effects), accelerate the reference frame with an ACEL command in the direction opposite to gravity."
Maybe you need to flip it.
Thanks for the answer. Yes, I have made the direction properly, but it doesnt work. Does this have something to do with mass scaling?
It's hard to say what's the problem without more details. However, the three key parameters controlling the structure self-weight are geometry, material density, and gravity acceleration.
Assuming a 10-mm-thick steel shell and a Y vertical axis, here's what you'd have to define in your Ansys APDL code:
SECTYPE,1,SHELL
SECDATA,0.010 !(m), thickness
MP, DENS, 1, 7850 !(kg/m3), density
ACEL, 0, 9.81, 0 !(m/s2), gravity
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